Overview
In this IoT project, we will learn how to build an ESP32 Fingerprint Voting Machine with Live Web Dashboard using ESP32, R503 Fingerprint Sensor, 0.96” OLED Display, four candidate push buttons, and a professional web dashboard. The ESP32 Wi-Fi module connects the system to a local network and hosts a real-time voting dashboard directly from the device. The R503 fingerprint sensor is used to enroll voters and verify identity before voting, while the OLED display shows system status, scan instructions, voter name, candidate selection prompts, vote confirmation, and registration messages.
This ESP32-based biometric voting machine allows voters to register their fingerprint along with personal details such as name, ID number, date of birth, sex, and city. Once a registered voter scans their finger, the system opens a short voting window and the voter presses one of four candidate buttons to cast a vote. Each fingerprint can vote only once. The dashboard displays live vote distribution, turnout, leading candidate, live activity feed, vote history, registered voter records, and election results. Vote data can also be exported as a CSV file for record-keeping or analysis.
The live web dashboard makes this project more advanced by providing a user-friendly interface for voter enrollment, live election monitoring, vote history, voter management, election reset, and fingerprint deletion. This project is a practical and low-cost solution for building a secure electronic voting machine with real-time results and biometric voter verification.
Components Required
Following are the components required to make the ESP32 Fingerprint Voting Machine with Live Web Dashboard. All these components can be purchased from the given links.
| S.N. | Components Name | Quantity | Purchase Link |
|---|---|---|---|
| 1 | ESP32 Board | 1 | Amazon | AliExpress |
| 2 | R503 Fingerprint Sensor | 1 | Amazon | AliExpress |
| 3 | OLED Display 0.96" | 1 | Amazon | AliExpress |
| 4 | 10uF Electrolytic Capacitor | 2 | Amazon | AliExpress |
| 5 | 0.1uF Ceramic Capacitor | 4 | Amazon | AliExpress |
| 6 | Jumper Wires | 4 | Amazon | AliExpress |
Block Diagram of ESP32 Fingerprint Voting Machine
Let’s take a look at the block diagram of the ESP32-based Fingerprint Voting Machine with Live Web Dashboard.
In this system, the R503 fingerprint sensor works as the input device and sends fingerprint data to the ESP32 for voter verification. After a registered voter is verified, the ESP32 displays instructions on the OLED screen, waits for a candidate button press, records the vote, and updates the web dashboard for real-time election monitoring.
The dashboard can show registered voters, live vote counts, turnout, leading candidate, vote history, and other election details in a simple and organized way.
R503 Fingerprint Module
The R503 fingerprint sensor is a compact biometric fingerprint identification module used for fingerprint enrollment, storage, and matching. It uses an optical fingerprint sensing system to capture a finger image, extract fingerprint features, and compare them with stored templates inside the module.
The sensor supports both 1:1 matching and 1:N searching. During enrollment, the user places the same finger two times. The module processes both fingerprint images, generates a fingerprint template, and stores it in its internal memory. During verification, the module captures a new fingerprint image and compares it with stored templates to identify whether the fingerprint matches or not.
Features & Specifications
The R503 fingerprint sensor is suitable for security systems, attendance systems, access control, smart locks, and embedded biometric projects.
| Feature | Specification |
|---|---|
| Operating Voltage | DC 3.3V |
| Interface | UART, 3.3V TTL logic level |
| Default Baud Rate | 57600 bps |
| Baud Rate Range | 9600 to 115200 bps |
| Matching Mode | 1:1 and 1:N |
| Fingerprint Storage Capacity | 200 templates |
| Image Resolution | 508 dpi |
| Sensing Array | 192 × 192 pixels |
| Detection Area | 15 mm diameter |
| Fingerprint Image Capture Time | Less than 0.2 seconds |
| Feature Generation Time | Less than 500 ms |
| Template Size | 768 bytes |
| Characteristic Value Size | 384 bytes |
| Security Levels | 1 to 5, with 5 being the highest |
| False Acceptance Rate, FAR | Less than 0.001% |
| False Rejection Rate, FRR | Less than 1% |
| Working Current | Around 20 mA during fingerprint acquisition |
| Standby Current | Around 2 µA in touch standby mode |
| Working Temperature | -20°C to +60°C |
| Storage Temperature | -40°C to +75°C |
The module also includes functions for enrolling fingerprints, deleting templates, clearing the fingerprint library, searching stored fingerprints, reading template count, controlling the LED ring, and checking sensor status. It communicates using a serial UART protocol, making it easy to use with microcontrollers such as ESP32, Arduino, STM32, and Raspberry Pi Pico.
Wiring
The R503 fingerprint sensor uses a 6-pin MX1.0 connector. It communicates with the microcontroller through UART serial communication.
| R503 Pin | Pin Name | Description |
|---|---|---|
| 1 | Power Supply | DC 3.3V |
| 2 | GND | Ground |
| 3 | TXD | Data output from sensor |
| 4 | RXD | Data input to sensor |
| 5 | WAKEUP | Finger detection signal |
| 6 | 3.3VT | Touch induction power supply, DC 3–6V |
Circuit Diagram
Let’s take a look at the schematic of the ESP32-based Fingerprint Voting Machine.
In this circuit, the ESP32 works as the main controller and is connected with the R503 fingerprint sensor, OLED display, and four candidate push buttons on GPIO pins D5, D18, D19, and D23. The R503 fingerprint sensor communicates with the ESP32 through UART pins, while the OLED display uses the I2C pins for showing scan status, voter name, candidate selection prompts, vote confirmation, and system messages.
The four candidate push buttons are connected as active-low inputs with internal pull-up resistors. After a registered voter scans their fingerprint, they press one button to vote for Candidate 1, 2, 3, or 4. Voter enrollment is done only from the web dashboard, not from physical buttons. Pull-up resistors are used with the buttons, so the ESP32 can read a stable HIGH or LOW signal when a button is pressed. Capacitors are also added near the modules to make the power supply more stable and reduce noise in the circuit.
PCB Designing & Gerber Files
The schematic of the ESP32 Fingerprint Voting Machine was created in EasyEDA, and from there it was converted into a compact PCB layout.
The board is designed with mostly through-hole components to make easier assembly. You can view the 2D view of the PCB.
All of the critical components, including the ESP32 module, are placed on the front side of the PCB, which makes assembly easier and more reliable.
Here are the link of files that you can download for PCB manufacturing and PCB assembly services.
- Download: Schematic PDF
- Download: Gerber File
PCB Ordering Online & Assembly
The Gerber file for this ESP32 Fingerprint Voting Machine is provided above. You can download the Gerber file and place an order with a PCB manufacturer like AIVON for as low as $1 for a PCB Prototype.
To order the PCB, visit the AIVON Official Website and upload the Gerber file using the Quote Now option. You can then choose your required parameters, such as Material Type, Dimensions, Quantity, Thickness, and Solder Mask Color.
AIVON is making PCB prototyping and assembly more affordable for new users by offering $1 PCB Prototype and $35 PCB Assembly with Shipping fee $30 OFF on your first PCB order. With this promotion, you can enjoy free shipping on your first order and affordable assembly service for your project.
Here is the promotion link: AIVON PCB/PCBA Promotion Offer
Once all the details are filled in, select your country and shipping method. After confirming everything, you can place the order and wait for your boards to arrive.
Assembly of the ESP32 Fingerprint Voting Machine
After I ordered the custom PCB, I received it within just 3 days. The PCB quality was very good, and it looked clean and professional. It is a double-sided PCB, which makes the circuit compact and neat.
Then I started soldering and assembling all the components on the board. For the ESP32 board, OLED display, fingerprint sensor, and candidate buttons, I used female header pins where needed. This makes it easy to remove or replace the modules later if required.
I also soldered the required capacitors on different parts of the PCB. These capacitors help to keep the power supply stable and reduce noise in the circuit. For the R503 Fingerprint sensor, I used 6 jumper wires to connect it to the PCB board terminal.
After soldering all the parts, I connected all the modules and completed the final assembly of the IoT ESP32 Fingerprint Voting Machine device.
Source Code/program
Let us take a look at the programming part of this project.
The code starts by including the required libraries for Wi-Fi, web server, fingerprint sensor, OLED display, and ESP32 memory storage. The WiFi and WebServer libraries are used to connect the ESP32 to the local network and host the live voting dashboard. The Adafruit Fingerprint library is used to communicate with the R503 fingerprint sensor, while the Adafruit GFX library and Adafruit SSD1306 library are used to display messages on the OLED screen.
In the Wi-Fi section, the SSID and password are added so the ESP32 can connect to the network. After connecting, the ESP32 shows its IP address on the OLED display and Serial Monitor. This IP address can be opened in a browser to access the professional web dashboard.
The main loop checks for fingerprint scans, dashboard enrollment requests, and candidate button presses. When a registered voter scans their finger, the ESP32 verifies the fingerprint, checks whether that voter has already voted, opens a voting window, and records the selected candidate when a button is pressed. Vote counts and voter status are saved in ESP32 NVS memory and shown on the dashboard in real time. New voters can be registered from the dashboard by entering name, ID number, date of birth, sex, and city.
The code is divided into two main parts: the main FPS_Voting_Machine.ino file for ESP32 voting control and the dashboard.h file for the live web dashboard interface.
Main .ino code
Copy the following code and paste it to your Arduino IDE editor window.
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#include <Wire.h> #include <WiFi.h> #include <WebServer.h> #include <Preferences.h> #include <time.h> #include <Adafruit_GFX.h> #include <Adafruit_SSD1306.h> #include <Adafruit_Fingerprint.h> #include "dashboard.h" // ===================================================== // WIFI SETTINGS // ===================================================== const char* WIFI_SSID = "****************"; const char* WIFI_PASSWORD = "***************"; // Ontario / Toronto timezone const char* TIME_ZONE = "EST5EDT,M3.2.0/2,M11.1.0/2"; WebServer server(80); Preferences prefs; // ===================================================== // OLED SETTINGS // ===================================================== #define SCREEN_WIDTH 128 #define SCREEN_HEIGHT 64 #define OLED_RESET -1 #define OLED_ADDR 0x3C #define OLED_SDA 21 #define OLED_SCL 22 Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); // ===================================================== // R503 FINGERPRINT SENSOR UART // ===================================================== #define FINGER_RX 16 #define FINGER_TX 17 HardwareSerial fingerSerial(2); Adafruit_Fingerprint finger = Adafruit_Fingerprint(&fingerSerial); // ===================================================== // CANDIDATE BUTTONS ONLY (active LOW, internal pull-up) // D5/D18/D19/D23 = Candidate 1-4 for voting after fingerprint scan. // Voter enrollment is dashboard-only (POST /api/enroll) — no enroll button. // ===================================================== #define BTN_CAND_1 5 #define BTN_CAND_2 18 #define BTN_CAND_3 19 #define BTN_CAND_4 23 #define NUM_CANDIDATES 4 #define VOTE_TIMEOUT_MS 15000 #define DEBOUNCE_MS 250 const uint8_t CAND_PINS[NUM_CANDIDATES] = {BTN_CAND_1, BTN_CAND_2, BTN_CAND_3, BTN_CAND_4}; const char* CANDIDATE_NAMES[NUM_CANDIDATES] = { "Candidate 1", "Candidate 2", "Candidate 3", "Candidate 4" }; unsigned long lastCandBtnTime[NUM_CANDIDATES] = {0, 0, 0, 0}; // ===================================================== // MATCH SETTINGS // ===================================================== #define MATCH_SECURITY_LEVEL 2 #define MAX_FINGERPRINTS 200 // ===================================================== // PROFILE STORAGE // ===================================================== struct PersonProfile { String name; String collegeId; String role; String department; String note; }; // ===================================================== // LOGGING // ===================================================== #define MAX_LOGS 80 struct AttendanceLog { String timeText; String event; int id; String name; String collegeId; String role; String department; String note; String candidate; String message; }; AttendanceLog logs[MAX_LOGS]; int logCount = 0; int logWriteIndex = 0; // ===================================================== // APP STATE // ===================================================== uint16_t nextEnrollID = 1; unsigned long lastIdleRefresh = 0; bool isEnrolling = false; bool cancelEnroll = false; bool duplicateFound = false; bool dashboardEnrollRequest = false; uint16_t cachedTemplateCount = 0; String cachedRegisteredJson = "{\"fingerprints\":[]}"; int candidateVotes[NUM_CANDIDATES] = {0, 0, 0, 0}; bool hasVoted[MAX_FINGERPRINTS + 1]; bool isSelectingCandidate = false; int pendingVoterId = -1; unsigned long voteWindowStart = 0; // Dashboard form values String pendingName = ""; String pendingCollegeId = ""; String pendingRole = ""; String pendingDepartment = ""; String pendingNote = ""; // ===================================================== // FUNCTION DECLARATIONS // ===================================================== void connectWiFi(); void setupTime(); void setupDashboardRoutes(); void smartDelay(unsigned long ms); String uptimeText(); String currentDateTimeText(); String jsonEscape(String s); String firstNameOnly(String fullName); void addLog(String event, int id, String message, String candidate = ""); AttendanceLog getLogByDisplayIndex(int i); void loadVoteState(); void saveVoteForVoter(uint16_t id); void saveCandidateVotes(); void clearVoterVoteState(uint16_t id); void resetAllVotes(); int getTotalVotes(); void castVote(int voterId, int candidateIndex); void handleCandidateSelection(); String profileKey(uint16_t id, const char* field); void saveProfile(uint16_t id, PersonProfile p); PersonProfile loadProfile(uint16_t id); void deleteProfile(uint16_t id); void oledScreen(String title, String line1 = "", String line2 = "", String line3 = ""); void oledBig(String title, String line1 = "", String line2 = ""); void oledScanScreen(); void oledScanAnimation(String title, String line1, uint16_t durationMs); void oledProgressBar(String title, String line1, uint8_t percent); void oledSuccessAnimation(String line1, String line2 = ""); void oledErrorAnimation(String line1, String line2 = ""); String clipText(String text, uint8_t maxChars); void drawCenteredText(String text, int y, uint8_t textSize); void drawTitleBar(String title); void drawMiniFingerprint(int x, int y); void drawLoadingDots(int x, int y, uint8_t frame); void drawMovingBar(int y, uint8_t frame); void drawProgress(uint8_t percent); void drawWiFiIcon(bool connected); bool buttonPressed(uint8_t pin, unsigned long &lastTime); int readCandidateButton(); bool checkCancelDuringEnroll(); void scanFingerprint(); uint8_t enrollFingerprint(uint16_t id); void waitForFingerRemove(); uint16_t findNextFreeID(uint16_t startID); void printSensorParameters(); void refreshTemplateCountSerialOnly(); void refreshTemplateCountCache(); void rebuildRegisteredCache(); void setMatchingSecuritySerialOnly(); // ===================================================== // SETUP // ===================================================== void setup() { Serial.begin(115200); delay(1000); for (int i = 0; i < NUM_CANDIDATES; i++) { pinMode(CAND_PINS[i], INPUT_PULLUP); } for (int i = 0; i <= MAX_FINGERPRINTS; i++) { hasVoted[i] = false; } prefs.begin("fps_db", false); loadVoteState(); Wire.begin(OLED_SDA, OLED_SCL); if (!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR)) { Serial.println("OLED not found"); while (1) { delay(1000); } } display.clearDisplay(); display.setTextWrap(false); display.display(); oledBig("STARTING", "Fingerprint", "Voting System"); smartDelay(900); connectWiFi(); setupTime(); setupDashboardRoutes(); fingerSerial.begin(57600, SERIAL_8N1, FINGER_RX, FINGER_TX); finger.begin(57600); smartDelay(500); oledScanAnimation("CHECKING", "Sensor", 900); if (finger.verifyPassword()) { Serial.println("Fingerprint sensor found!"); addLog("INFO", -1, "Fingerprint sensor ready"); oledSuccessAnimation("Sensor ready"); smartDelay(900); } else { Serial.println("Fingerprint sensor not found!"); addLog("ERROR", -1, "Fingerprint sensor not found"); oledErrorAnimation("Sensor not found", "Check wiring"); while (1) { server.handleClient(); delay(10); } } printSensorParameters(); setMatchingSecuritySerialOnly(); refreshTemplateCountSerialOnly(); rebuildRegisteredCache(); nextEnrollID = findNextFreeID(1); Serial.print("Next enroll ID: "); Serial.println(nextEnrollID); addLog("INFO", -1, "System ready"); smartDelay(500); oledScanScreen(); } // ===================================================== // LOOP // ===================================================== void loop() { server.handleClient(); // Enrollment starts ONLY from the web dashboard (never from physical buttons). if (dashboardEnrollRequest && !isEnrolling && !isSelectingCandidate) { dashboardEnrollRequest = false; if (pendingName.length() > 0) { addLog("ENROLL", -1, "Enrollment started for " + pendingName); } else { addLog("ENROLL", -1, "Enrollment started"); } isEnrolling = true; cancelEnroll = false; duplicateFound = false; uint8_t result = enrollFingerprint(nextEnrollID); if (cancelEnroll) { addLog("CANCEL", -1, "Enrollment cancelled"); oledBig("CANCELLED", "Back to scan"); smartDelay(1200); } else if (duplicateFound) { addLog("DUPLICATE", finger.fingerID, "Fingerprint already exists"); smartDelay(1200); } else if (result == FINGERPRINT_OK) { PersonProfile p; p.name = pendingName; p.collegeId = pendingCollegeId; p.role = pendingRole; p.department = pendingDepartment; p.note = pendingNote; saveProfile(nextEnrollID, p); String savedName = firstNameOnly(p.name); if (savedName.length() == 0) { savedName = "ID " + String(nextEnrollID); } String enrollMsg = "Fingerprint enrolled successfully"; if (p.name.length() > 0) { enrollMsg = p.name + " enrolled successfully"; } addLog("ENROLLED", nextEnrollID, enrollMsg); oledSuccessAnimation("Saved", savedName); Serial.print("Enrollment successful. ID: "); Serial.println(nextEnrollID); smartDelay(1200); refreshTemplateCountSerialOnly(); rebuildRegisteredCache(); nextEnrollID = findNextFreeID(nextEnrollID + 1); } else { addLog("ERROR", -1, "Enrollment failed"); oledErrorAnimation("Not saved", "Try again"); smartDelay(1600); } pendingName = ""; pendingCollegeId = ""; pendingRole = ""; pendingDepartment = ""; pendingNote = ""; isEnrolling = false; cancelEnroll = false; duplicateFound = false; oledScanScreen(); } if (isSelectingCandidate) { handleCandidateSelection(); } if (!isEnrolling && !isSelectingCandidate) { scanFingerprint(); } delay(30); } // ===================================================== // SMART DELAY // ===================================================== void smartDelay(unsigned long ms) { unsigned long start = millis(); while (millis() - start < ms) { server.handleClient(); delay(5); } } // ===================================================== // WIFI + TIME + DASHBOARD ROUTES // ===================================================== void connectWiFi() { WiFi.mode(WIFI_STA); WiFi.begin(WIFI_SSID, WIFI_PASSWORD); unsigned long start = millis(); uint8_t frame = 0; while (WiFi.status() != WL_CONNECTED && millis() - start < 15000) { display.clearDisplay(); drawTitleBar("WIFI"); drawCenteredText("Connecting", 24, 1); drawLoadingDots(28, 42, frame); display.display(); frame++; delay(300); } if (WiFi.status() == WL_CONNECTED) { Serial.print("WiFi connected. IP: "); Serial.println(WiFi.localIP()); oledBig("WIFI OK", "IP Address", WiFi.localIP().toString()); smartDelay(5000); } else { Serial.println("WiFi not connected."); oledBig("WIFI OFF", "Dashboard offline"); smartDelay(1800); } } void setupTime() { if (WiFi.status() != WL_CONNECTED) { Serial.println("WiFi not connected. NTP skipped."); return; } configTzTime(TIME_ZONE, "pool.ntp.org", "time.nist.gov", "time.google.com"); Serial.print("Syncing time"); struct tm timeinfo; int retry = 0; while (!getLocalTime(&timeinfo, 1000) && retry < 12) { Serial.print("."); retry++; server.handleClient(); } Serial.println(); if (retry < 12) { Serial.print("Time synced: "); Serial.println(currentDateTimeText()); } else { Serial.println("Time sync failed. Using uptime fallback."); } } void setupDashboardRoutes() { server.on("/", HTTP_GET, []() { server.send_P(200, "text/html", DASHBOARD_HTML); }); server.on("/api/status", HTTP_GET, []() { String lastJson = "null"; if (logCount > 0) { AttendanceLog l = getLogByDisplayIndex(logCount - 1); lastJson = "{"; lastJson += "\"time\":\"" + jsonEscape(l.timeText) + "\","; lastJson += "\"event\":\"" + jsonEscape(l.event) + "\","; lastJson += "\"id\":" + String(l.id) + ","; lastJson += "\"name\":\"" + jsonEscape(l.name) + "\","; lastJson += "\"collegeId\":\"" + jsonEscape(l.collegeId) + "\","; lastJson += "\"role\":\"" + jsonEscape(l.role) + "\","; lastJson += "\"department\":\"" + jsonEscape(l.department) + "\","; lastJson += "\"note\":\"" + jsonEscape(l.note) + "\","; lastJson += "\"candidate\":\"" + jsonEscape(l.candidate) + "\","; lastJson += "\"message\":\"" + jsonEscape(l.message) + "\""; lastJson += "}"; } String voteCountsJson = "["; for (int i = 0; i < NUM_CANDIDATES; i++) { if (i > 0) { voteCountsJson += ","; } voteCountsJson += String(candidateVotes[i]); } voteCountsJson += "]"; String candidatesJson = "["; for (int i = 0; i < NUM_CANDIDATES; i++) { if (i > 0) { candidatesJson += ","; } candidatesJson += "\"" + jsonEscape(String(CANDIDATE_NAMES[i])) + "\""; } candidatesJson += "]"; String json = "{"; json += "\"wifi\":" + String(WiFi.status() == WL_CONNECTED ? "true" : "false") + ","; json += "\"ip\":\"" + String(WiFi.status() == WL_CONNECTED ? WiFi.localIP().toString() : "") + "\","; json += "\"templates\":" + String(cachedTemplateCount) + ","; json += "\"nextId\":" + String(nextEnrollID) + ","; json += "\"logCount\":" + String(logCount) + ","; json += "\"voteCounts\":" + voteCountsJson + ","; json += "\"totalVotes\":" + String(getTotalVotes()) + ","; json += "\"totalVoters\":" + String(cachedTemplateCount) + ","; json += "\"candidates\":" + candidatesJson + ","; json += "\"isEnrolling\":" + String(isEnrolling ? "true" : "false") + ","; json += "\"isSelectingVote\":" + String(isSelectingCandidate ? "true" : "false") + ","; json += "\"pendingVoterId\":" + String(pendingVoterId) + ","; json += "\"sensor\":\"Ready\","; json += "\"last\":" + lastJson; json += "}"; server.send(200, "application/json", json); }); server.on("/api/logs", HTTP_GET, []() { String json = "{\"logs\":["; for (int i = 0; i < logCount; i++) { AttendanceLog l = getLogByDisplayIndex(i); if (i > 0) { json += ","; } json += "{"; json += "\"time\":\"" + jsonEscape(l.timeText) + "\","; json += "\"event\":\"" + jsonEscape(l.event) + "\","; json += "\"id\":" + String(l.id) + ","; json += "\"name\":\"" + jsonEscape(l.name) + "\","; json += "\"collegeId\":\"" + jsonEscape(l.collegeId) + "\","; json += "\"role\":\"" + jsonEscape(l.role) + "\","; json += "\"department\":\"" + jsonEscape(l.department) + "\","; json += "\"note\":\"" + jsonEscape(l.note) + "\","; json += "\"candidate\":\"" + jsonEscape(l.candidate) + "\","; json += "\"message\":\"" + jsonEscape(l.message) + "\""; json += "}"; } json += "]}"; server.send(200, "application/json", json); }); server.on("/api/registered", HTTP_GET, []() { server.send(200, "application/json", cachedRegisteredJson); }); server.on("/api/enroll", HTTP_POST, []() { if (isEnrolling || dashboardEnrollRequest) { server.send(409, "application/json", "{\"ok\":false,\"message\":\"Enrollment already running\"}"); return; } pendingName = server.arg("name"); pendingCollegeId = server.arg("collegeId"); pendingRole = server.arg("role"); pendingDepartment = server.arg("department"); pendingNote = server.arg("note"); dashboardEnrollRequest = true; String msg = "Enroll requested from dashboard"; if (pendingName.length() > 0) { msg += " for " + pendingName; } addLog("ENROLL REQUEST", -1, msg); server.send(200, "application/json", "{\"ok\":true,\"message\":\"Enrollment requested\"}"); }); server.on("/api/cancel", HTTP_POST, []() { cancelEnroll = true; dashboardEnrollRequest = false; addLog("CANCEL", -1, "Cancel requested from dashboard"); server.send(200, "application/json", "{\"ok\":true,\"message\":\"Cancel requested\"}"); }); server.on("/api/fingerprint", HTTP_DELETE, []() { if (!server.hasArg("id")) { server.send(400, "application/json", "{\"ok\":false,\"message\":\"Missing ID\"}"); return; } int id = server.arg("id").toInt(); if (id < 1 || id > MAX_FINGERPRINTS) { server.send(400, "application/json", "{\"ok\":false,\"message\":\"Invalid ID\"}"); return; } if (isEnrolling) { server.send(409, "application/json", "{\"ok\":false,\"message\":\"Enrollment running. Try again later.\"}"); return; } uint8_t p = finger.deleteModel(id); smartDelay(150); uint8_t verify = finger.loadModel(id); if (p == FINGERPRINT_OK && verify != FINGERPRINT_OK) { deleteProfile(id); clearVoterVoteState(id); addLog("DELETE", id, "Fingerprint deleted from sensor memory"); refreshTemplateCountSerialOnly(); rebuildRegisteredCache(); nextEnrollID = findNextFreeID(1); server.send(200, "application/json", "{\"ok\":true,\"message\":\"Fingerprint deleted from sensor memory\"}"); } else if (p == FINGERPRINT_OK && verify == FINGERPRINT_OK) { addLog("ERROR", id, "Delete command sent but fingerprint still exists"); server.send(500, "application/json", "{\"ok\":false,\"message\":\"Delete command sent but fingerprint still exists in sensor\"}"); } else { addLog("ERROR", id, "Delete failed"); server.send(500, "application/json", "{\"ok\":false,\"message\":\"Delete failed. Fingerprint may not exist or sensor rejected command\"}"); } }); server.on("/api/export", HTTP_GET, []() { String csv = "time,event,fingerprint_id,name,college_id,role,department,candidate,message "; for (int i = 0; i < logCount; i++) { AttendanceLog l = getLogByDisplayIndex(i); csv += "\"" + l.timeText + "\","; csv += "\"" + l.event + "\","; csv += String(l.id) + ","; csv += "\"" + l.name + "\","; csv += "\"" + l.collegeId + "\","; csv += "\"" + l.role + "\","; csv += "\"" + l.department + "\","; csv += "\"" + l.candidate + "\","; csv += "\"" + l.message + "\" "; } server.sendHeader("Content-Disposition", "attachment; filename=vote_logs.csv"); server.send(200, "text/csv", csv); }); server.on("/api/reset-votes", HTTP_POST, []() { if (isEnrolling || isSelectingCandidate) { server.send(409, "application/json", "{\"ok\":false,\"message\":\"Cannot reset while enrollment or voting is active\"}"); return; } resetAllVotes(); server.send(200, "application/json", "{\"ok\":true,\"message\":\"Election reset successfully\"}"); }); server.begin(); Serial.println("Dashboard server started."); } // ===================================================== // PROFILE STORAGE FUNCTIONS // ===================================================== String profileKey(uint16_t id, const char* field) { return String(id) + "_" + String(field); } void saveProfile(uint16_t id, PersonProfile p) { prefs.putString(profileKey(id, "name").c_str(), p.name); prefs.putString(profileKey(id, "cid").c_str(), p.collegeId); prefs.putString(profileKey(id, "role").c_str(), p.role); prefs.putString(profileKey(id, "dept").c_str(), p.department); prefs.putString(profileKey(id, "note").c_str(), p.note); } PersonProfile loadProfile(uint16_t id) { PersonProfile p; p.name = prefs.getString(profileKey(id, "name").c_str(), ""); p.collegeId = prefs.getString(profileKey(id, "cid").c_str(), ""); p.role = prefs.getString(profileKey(id, "role").c_str(), ""); p.department = prefs.getString(profileKey(id, "dept").c_str(), ""); p.note = prefs.getString(profileKey(id, "note").c_str(), ""); return p; } void deleteProfile(uint16_t id) { prefs.remove(profileKey(id, "name").c_str()); prefs.remove(profileKey(id, "cid").c_str()); prefs.remove(profileKey(id, "role").c_str()); prefs.remove(profileKey(id, "dept").c_str()); prefs.remove(profileKey(id, "note").c_str()); prefs.remove(profileKey(id, "voted").c_str()); } // ===================================================== // LOG + TIME FUNCTIONS // ===================================================== String uptimeText() { return currentDateTimeText(); } String currentDateTimeText() { struct tm timeinfo; if (getLocalTime(&timeinfo, 1000)) { char buf[24]; strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", &timeinfo); return String(buf); } unsigned long total = millis() / 1000; unsigned long h = total / 3600; unsigned long m = (total % 3600) / 60; unsigned long s = total % 60; char buf[24]; snprintf(buf, sizeof(buf), "UPTIME %02lu:%02lu:%02lu", h, m, s); return String(buf); } String jsonEscape(String s) { s.replace("\", "\\"); s.replace("\"", "\\""); s.replace(" ", "\n"); s.replace(" ", ""); return s; } String firstNameOnly(String fullName) { fullName.trim(); if (fullName.length() == 0) { return ""; } int spaceIndex = fullName.indexOf(' '); if (spaceIndex > 0) { return fullName.substring(0, spaceIndex); } return fullName; } void addLog(String event, int id, String message, String candidate) { logs[logWriteIndex].timeText = uptimeText(); logs[logWriteIndex].event = event; logs[logWriteIndex].id = id; logs[logWriteIndex].message = message; logs[logWriteIndex].candidate = candidate; logs[logWriteIndex].name = ""; logs[logWriteIndex].collegeId = ""; logs[logWriteIndex].role = ""; logs[logWriteIndex].department = ""; logs[logWriteIndex].note = ""; if (id >= 1 && id <= MAX_FINGERPRINTS) { PersonProfile p = loadProfile(id); logs[logWriteIndex].name = p.name; logs[logWriteIndex].collegeId = p.collegeId; logs[logWriteIndex].role = p.role; logs[logWriteIndex].department = p.department; logs[logWriteIndex].note = p.note; } logWriteIndex = (logWriteIndex + 1) % MAX_LOGS; if (logCount < MAX_LOGS) { logCount++; } Serial.print("[LOG] "); Serial.print(event); Serial.print(" ID="); Serial.print(id); Serial.print(" "); Serial.println(message); } AttendanceLog getLogByDisplayIndex(int i) { int start = (logWriteIndex - logCount + MAX_LOGS) % MAX_LOGS; int idx = (start + i) % MAX_LOGS; return logs[idx]; } // ===================================================== // OLED DISPLAY FUNCTIONS // ===================================================== String clipText(String text, uint8_t maxChars) { text.trim(); if (text.length() <= maxChars) { return text; } if (maxChars <= 1) { return text.substring(0, maxChars); } return text.substring(0, maxChars - 1) + "."; } void drawCenteredText(String text, int y, uint8_t textSize) { text.trim(); uint8_t maxChars = (textSize == 2) ? 10 : 21; text = clipText(text, maxChars); int charWidth = 6 * textSize; int textWidth = text.length() * charWidth; int x = (SCREEN_WIDTH - textWidth) / 2; if (x < 0) { x = 0; } display.setTextSize(textSize); display.setTextColor(SSD1306_WHITE, SSD1306_BLACK); display.setCursor(x, y); display.print(text); } void drawWiFiIcon(bool connected) { int x = 113; int y = 2; if (connected) { display.drawCircle(x + 7, y + 11, 1, SSD1306_WHITE); display.drawLine(x + 2, y + 8, x + 7, y + 4, SSD1306_WHITE); display.drawLine(x + 7, y + 4, x + 12, y + 8, SSD1306_WHITE); display.drawLine(x + 4, y + 10, x + 7, y + 8, SSD1306_WHITE); display.drawLine(x + 7, y + 8, x + 10, y + 10, SSD1306_WHITE); } else { display.drawRect(x + 1, y + 3, 12, 9, SSD1306_WHITE); display.drawLine(x, y + 2, x + 14, y + 13, SSD1306_WHITE); display.drawLine(x + 14, y + 2, x, y + 13, SSD1306_WHITE); } } void drawTitleBar(String title) { display.fillRect(0, 0, 128, 16, SSD1306_BLACK); String shortTitle = clipText(title, 16); int textWidth = shortTitle.length() * 6; int x = (112 - textWidth) / 2; if (x < 0) { x = 0; } display.setTextSize(1); display.setTextColor(SSD1306_WHITE, SSD1306_BLACK); display.setCursor(x, 2); display.print(shortTitle); drawWiFiIcon(WiFi.status() == WL_CONNECTED); display.drawLine(0, 15, 127, 15, SSD1306_WHITE); } void oledScreen(String title, String line1, String line2, String line3) { display.clearDisplay(); display.setTextWrap(false); drawTitleBar(title); if (line1.length() > 0) { drawCenteredText(line1, 22, 1); } if (line2.length() > 0) { drawCenteredText(line2, 36, 1); } if (line3.length() > 0) { drawCenteredText(line3, 50, 1); } display.display(); } void oledBig(String title, String line1, String line2) { display.clearDisplay(); display.setTextWrap(false); drawTitleBar(title); if (line1.length() > 0) { drawCenteredText(line1, 24, 1); } if (line2.length() > 0) { drawCenteredText(line2, 42, 1); } display.display(); } void drawMiniFingerprint(int x, int y) { display.drawCircle(x + 18, y + 18, 17, SSD1306_WHITE); display.drawCircle(x + 18, y + 18, 12, SSD1306_WHITE); display.drawCircle(x + 18, y + 18, 7, SSD1306_WHITE); display.fillRect(x - 2, y + 28, 42, 14, SSD1306_BLACK); display.fillRect(x - 2, y - 2, 7, 44, SSD1306_BLACK); display.fillRect(x + 32, y - 2, 8, 44, SSD1306_BLACK); display.drawLine(x + 18, y + 18, x + 18, y + 36, SSD1306_WHITE); display.drawLine(x + 12, y + 21, x + 10, y + 35, SSD1306_WHITE); display.drawLine(x + 24, y + 21, x + 28, y + 34, SSD1306_WHITE); } void drawLoadingDots(int x, int y, uint8_t frame) { display.setTextSize(1); display.setTextColor(SSD1306_WHITE, SSD1306_BLACK); display.setCursor(x, y); display.print("Please wait"); for (uint8_t i = 0; i < frame % 4; i++) { display.print("."); } } void drawMovingBar(int y, uint8_t frame) { int boxX = 12; int boxW = 104; int fillW = 22; int pos = (frame * 8) % (boxW - fillW); display.drawRect(boxX, y, boxW, 8, SSD1306_WHITE); display.fillRect(boxX + 2 + pos, y + 2, fillW, 4, SSD1306_WHITE); } void drawProgress(uint8_t percent) { if (percent > 100) { percent = 100; } int barX = 10; int barY = 52; int barW = 108; int barH = 9; display.drawRect(barX, barY, barW, barH, SSD1306_WHITE); int fillW = map(percent, 0, 100, 0, barW - 4); display.fillRect(barX + 2, barY + 2, fillW, barH - 4, SSD1306_WHITE); display.setTextSize(1); display.setTextColor(SSD1306_WHITE, SSD1306_BLACK); display.setCursor(52, 41); display.print(percent); display.print("%"); } void oledScanScreen() { static uint8_t idleFrame = 0; idleFrame++; display.clearDisplay(); display.setTextWrap(false); drawTitleBar("SCAN TO VOTE"); drawMiniFingerprint(8, 22); display.setTextSize(1); display.setTextColor(SSD1306_WHITE, SSD1306_BLACK); display.setCursor(56, 24); display.print("Scan to vote"); display.setCursor(56, 38); display.print("Waiting"); for (uint8_t i = 0; i < idleFrame % 4; i++) { display.print("."); } int r = 3 + (idleFrame % 4); display.drawCircle(103, 50, r, SSD1306_WHITE); display.display(); } void oledScanAnimation(String title, String line1, uint16_t durationMs) { unsigned long startTime = millis(); uint8_t frame = 0; while (millis() - startTime < durationMs) { server.handleClient(); display.clearDisplay(); display.setTextWrap(false); drawTitleBar(title); drawMiniFingerprint(8, 21); display.setTextSize(1); display.setTextColor(SSD1306_WHITE, SSD1306_BLACK); display.setCursor(56, 24); display.print(clipText(line1, 11)); drawLoadingDots(56, 38, frame); int scanY = 22 + ((frame * 4) % 32); display.drawLine(8, scanY, 45, scanY, SSD1306_WHITE); display.drawLine(8, scanY + 1, 45, scanY + 1, SSD1306_WHITE); drawMovingBar(54, frame); display.display(); frame++; delay(100); } } void oledProgressBar(String title, String line1, uint8_t percent) { display.clearDisplay(); display.setTextWrap(false); drawTitleBar(title); drawCenteredText(line1, 24, 1); drawProgress(percent); display.display(); } void oledSuccessAnimation(String line1, String line2) { for (int r = 3; r <= 14; r += 3) { server.handleClient(); display.clearDisplay(); display.setTextWrap(false); drawTitleBar("SUCCESS"); display.drawCircle(64, 34, r, SSD1306_WHITE); if (r >= 9) { display.drawLine(56, 34, 62, 41, SSD1306_WHITE); display.drawLine(62, 41, 74, 27, SSD1306_WHITE); display.drawLine(56, 35, 62, 42, SSD1306_WHITE); display.drawLine(62, 42, 74, 28, SSD1306_WHITE); } display.display(); smartDelay(120); } smartDelay(300); if (line2.length() > 0) { oledBig("SUCCESS", line1, line2); } else { oledBig("SUCCESS", line1); } } void oledErrorAnimation(String line1, String line2) { for (int i = 0; i < 3; i++) { server.handleClient(); display.clearDisplay(); display.setTextWrap(false); drawTitleBar("NOTICE"); display.drawCircle(64, 34, 13, SSD1306_WHITE); display.drawLine(56, 26, 72, 42, SSD1306_WHITE); display.drawLine(72, 26, 56, 42, SSD1306_WHITE); display.drawLine(57, 26, 73, 42, SSD1306_WHITE); display.drawLine(73, 26, 57, 42, SSD1306_WHITE); display.display(); smartDelay(180); display.clearDisplay(); drawTitleBar("NOTICE"); display.display(); smartDelay(100); } if (line2.length() > 0) { oledBig("TRY AGAIN", line1, line2); } else { oledBig("TRY AGAIN", line1); } } // ===================================================== // BUTTON HANDLING // ===================================================== bool buttonPressed(uint8_t pin, unsigned long &lastTime) { if (digitalRead(pin) == LOW) { if (millis() - lastTime > DEBOUNCE_MS) { lastTime = millis(); return true; } } return false; } int readCandidateButton() { // Candidate buttons are ignored outside the post-scan voting window. if (!isSelectingCandidate || isEnrolling) { return -1; } for (int i = 0; i < NUM_CANDIDATES; i++) { if (buttonPressed(CAND_PINS[i], lastCandBtnTime[i])) { while (digitalRead(CAND_PINS[i]) == LOW) { server.handleClient(); delay(10); } return i; } } return -1; } bool checkCancelDuringEnroll() { server.handleClient(); if (cancelEnroll) { cancelEnroll = true; oledBig("CANCELLED", "Back to scan"); smartDelay(800); return true; } return false; } // ===================================================== // SCAN FINGERPRINT - STABLE VERSION // ===================================================== void scanFingerprint() { uint8_t p = finger.getImage(); if (p == FINGERPRINT_NOFINGER) { if (millis() - lastIdleRefresh > 700) { lastIdleRefresh = millis(); oledScanScreen(); } return; } if (p != FINGERPRINT_OK) { addLog("ERROR", -1, "Could not read fingerprint"); oledErrorAnimation("Could not read", "Place properly"); smartDelay(800); waitForFingerRemove(); oledScanScreen(); return; } oledScreen("SCANNING", "Hold finger", "Reading..."); p = finger.image2Tz(1); if (p != FINGERPRINT_OK) { addLog("ERROR", -1, "Fingerprint image not clear"); oledErrorAnimation("Finger not clear", "Try again"); smartDelay(800); waitForFingerRemove(); oledScanScreen(); return; } refreshTemplateCountSerialOnly(); if (finger.templateCount == 0) { addLog("NOT FOUND", -1, "No fingerprints stored"); oledBig("NOT FOUND", "No saved print"); smartDelay(1600); waitForFingerRemove(); oledScanScreen(); return; } oledScreen("SEARCHING", "Please wait", "Checking..."); // IMPORTANT: // fingerSearch(1) is more reliable for your R503. // If it fails, fastSearch is tried as fallback. p = finger.fingerSearch(1); if (p != FINGERPRINT_OK) { p = finger.fingerFastSearch(); } if (p == FINGERPRINT_OK) { int id = finger.fingerID; PersonProfile profile = loadProfile(id); String fullName = profile.name; String displayName = firstNameOnly(fullName); if (displayName.length() == 0) { displayName = "ID " + String(id); } String logName = fullName; if (logName.length() == 0) { logName = "ID " + String(id); } waitForFingerRemove(); if (id >= 1 && id <= MAX_FINGERPRINTS && hasVoted[id]) { addLog("ALREADY VOTED", id, logName + " already voted"); oledErrorAnimation("Already Voted", displayName); smartDelay(1500); oledScanScreen(); return; } if (id >= 1 && id <= MAX_FINGERPRINTS) { pendingVoterId = id; isSelectingCandidate = true; voteWindowStart = millis(); addLog("VOTE PENDING", id, logName + " select candidate"); oledScreen("VOTING", "Welcome " + clipText(displayName, 14), "Press Candidate Btn"); return; } addLog("MATCH", id, logName + " matched"); oledSuccessAnimation("Matched", displayName); smartDelay(1500); oledScanScreen(); return; } if (p == FINGERPRINT_NOTFOUND) { addLog("NOT FOUND", -1, "No matching fingerprint"); oledErrorAnimation("Not found", "No match"); smartDelay(1200); waitForFingerRemove(); oledScanScreen(); return; } addLog("ERROR", -1, "Fingerprint search failed"); oledErrorAnimation("Search failed", "Try again"); smartDelay(1200); waitForFingerRemove(); oledScanScreen(); } // ===================================================== // ENROLL FINGERPRINT // ===================================================== uint8_t enrollFingerprint(uint16_t id) { int p = -1; oledProgressBar("ENROLLING", "Place finger", 10); while (p != FINGERPRINT_OK) { server.handleClient(); if (checkCancelDuringEnroll()) { return 255; } p = finger.getImage(); if (p == FINGERPRINT_OK) { oledProgressBar("ENROLLING", "Checking", 20); smartDelay(500); break; } else if (p == FINGERPRINT_NOFINGER) { // waiting } else { oledErrorAnimation("Could not read", "Try again"); return p; } delay(100); } if (checkCancelDuringEnroll()) { return 255; } p = finger.image2Tz(1); if (p != FINGERPRINT_OK) { oledErrorAnimation("Finger not clear", "Try again"); return p; } refreshTemplateCountSerialOnly(); if (finger.templateCount > 0) { oledProgressBar("CHECKING", "Existing", 30); uint8_t searchResult = finger.fingerSearch(1); if (searchResult != FINGERPRINT_OK) { searchResult = finger.fingerFastSearch(); } if (searchResult == FINGERPRINT_OK) { duplicateFound = true; PersonProfile existingProfile = loadProfile(finger.fingerID); String existingName = firstNameOnly(existingProfile.name); if (existingName.length() == 0) { existingName = "ID " + String(finger.fingerID); } addLog("DUPLICATE", finger.fingerID, "Already enrolled"); oledBig("ALREADY", existingName); smartDelay(2500); waitForFingerRemove(); return 255; } } oledProgressBar("ENROLLING", "First scan OK", 40); smartDelay(600); oledProgressBar("ENROLLING", "Remove finger", 50); smartDelay(1200); while (finger.getImage() != FINGERPRINT_NOFINGER) { server.handleClient(); if (checkCancelDuringEnroll()) { return 255; } delay(100); } smartDelay(500); p = -1; oledProgressBar("ENROLLING", "Same finger", 65); while (p != FINGERPRINT_OK) { server.handleClient(); if (checkCancelDuringEnroll()) { return 255; } p = finger.getImage(); if (p == FINGERPRINT_OK) { oledProgressBar("ENROLLING", "Second OK", 75); smartDelay(500); break; } else if (p == FINGERPRINT_NOFINGER) { // waiting } else { oledErrorAnimation("Could not read", "Try again"); return p; } delay(100); } if (checkCancelDuringEnroll()) { return 255; } p = finger.image2Tz(2); if (p != FINGERPRINT_OK) { oledErrorAnimation("Finger not clear", "Try again"); return p; } oledProgressBar("PROCESSING", "Creating", 85); p = finger.createModel(); if (p == FINGERPRINT_OK) { // model created } else if (p == FINGERPRINT_ENROLLMISMATCH) { oledErrorAnimation("Mismatch", "Use same finger"); return p; } else { oledErrorAnimation("Could not save", "Try again"); return p; } oledProgressBar("SAVING", "Please wait", 95); p = finger.storeModel(id); if (p == FINGERPRINT_OK) { oledProgressBar("SAVING", "Complete", 100); smartDelay(500); return FINGERPRINT_OK; } else { oledErrorAnimation("Memory problem", "Not saved"); return p; } } // ===================================================== // VOTING FUNCTIONS // ===================================================== void loadVoteState() { for (int i = 1; i <= MAX_FINGERPRINTS; i++) { hasVoted[i] = prefs.getBool(profileKey(i, "voted").c_str(), false); } candidateVotes[0] = prefs.getUInt("votes_c1", 0); candidateVotes[1] = prefs.getUInt("votes_c2", 0); candidateVotes[2] = prefs.getUInt("votes_c3", 0); candidateVotes[3] = prefs.getUInt("votes_c4", 0); } void saveVoteForVoter(uint16_t id) { prefs.putBool(profileKey(id, "voted").c_str(), true); } void saveCandidateVotes() { prefs.putUInt("votes_c1", candidateVotes[0]); prefs.putUInt("votes_c2", candidateVotes[1]); prefs.putUInt("votes_c3", candidateVotes[2]); prefs.putUInt("votes_c4", candidateVotes[3]); } void clearVoterVoteState(uint16_t id) { if (id >= 1 && id <= MAX_FINGERPRINTS) { hasVoted[id] = false; } prefs.remove(profileKey(id, "voted").c_str()); } void resetAllVotes() { for (int i = 1; i <= MAX_FINGERPRINTS; i++) { clearVoterVoteState(i); } for (int i = 0; i < NUM_CANDIDATES; i++) { candidateVotes[i] = 0; } saveCandidateVotes(); addLog("RESET", -1, "Election reset - all votes cleared"); } int getTotalVotes() { int total = 0; for (int i = 0; i < NUM_CANDIDATES; i++) { total += candidateVotes[i]; } return total; } void castVote(int voterId, int candidateIndex) { if (voterId < 1 || voterId > MAX_FINGERPRINTS) { return; } if (candidateIndex < 0 || candidateIndex >= NUM_CANDIDATES) { return; } candidateVotes[candidateIndex]++; hasVoted[voterId] = true; saveVoteForVoter(voterId); saveCandidateVotes(); String candName = String(CANDIDATE_NAMES[candidateIndex]); addLog("VOTE", voterId, "Voted for " + candName, candName); oledSuccessAnimation("Vote Cast", candName); smartDelay(1200); } void handleCandidateSelection() { server.handleClient(); if (millis() - voteWindowStart > VOTE_TIMEOUT_MS) { int voterId = pendingVoterId; addLog("VOTE TIMEOUT", voterId, "Candidate selection timed out"); isSelectingCandidate = false; pendingVoterId = -1; oledErrorAnimation("Time Expired", "Scan again"); smartDelay(1200); oledScanScreen(); return; } int candidateIndex = readCandidateButton(); if (candidateIndex < 0) { return; } int voterId = pendingVoterId; isSelectingCandidate = false; pendingVoterId = -1; castVote(voterId, candidateIndex); oledScanScreen(); } // ===================================================== // HELPERS // ===================================================== void waitForFingerRemove() { uint8_t p = finger.getImage(); while (p != FINGERPRINT_NOFINGER) { server.handleClient(); delay(100); p = finger.getImage(); } } uint16_t findNextFreeID(uint16_t startID) { if (startID < 1) { startID = 1; } for (uint16_t id = startID; id <= MAX_FINGERPRINTS; id++) { server.handleClient(); uint8_t p = finger.loadModel(id); if (p != FINGERPRINT_OK) { return id; } } return MAX_FINGERPRINTS; } void refreshTemplateCountSerialOnly() { uint8_t p = finger.getTemplateCount(); if (p == FINGERPRINT_OK) { cachedTemplateCount = finger.templateCount; Serial.print("Stored fingerprints: "); Serial.println(cachedTemplateCount); } else { Serial.println("Could not read template count."); } delay(20); } void refreshTemplateCountCache() { uint8_t p = finger.getTemplateCount(); if (p == FINGERPRINT_OK) { cachedTemplateCount = finger.templateCount; } delay(20); } void rebuildRegisteredCache() { String json = "{\"fingerprints\":["; bool first = true; for (uint16_t id = 1; id <= MAX_FINGERPRINTS; id++) { server.handleClient(); uint8_t p = finger.loadModel(id); if (p == FINGERPRINT_OK) { PersonProfile profile = loadProfile(id); if (!first) { json += ","; } json += "{"; json += "\"id\":" + String(id) + ","; json += "\"name\":\"" + jsonEscape(profile.name) + "\","; json += "\"collegeId\":\"" + jsonEscape(profile.collegeId) + "\","; json += "\"role\":\"" + jsonEscape(profile.role) + "\","; json += "\"department\":\"" + jsonEscape(profile.department) + "\","; json += "\"dob\":\"" + jsonEscape(profile.note) + "\""; json += "}"; first = false; } } json += "]}"; cachedRegisteredJson = json; } void setMatchingSecuritySerialOnly() { Serial.print("Setting security level to "); Serial.println(MATCH_SECURITY_LEVEL); uint8_t p = finger.setSecurityLevel(MATCH_SECURITY_LEVEL); if (p == FINGERPRINT_OK) { Serial.println("Security level updated."); } else { Serial.println("Could not update security level."); } delay(100); finger.getParameters(); Serial.print("Current security level: "); Serial.println(finger.security_level); } void printSensorParameters() { finger.getParameters(); Serial.println(); Serial.println("Sensor parameters:"); Serial.print("Status: 0x"); Serial.println(finger.status_reg, HEX); Serial.print("System ID: 0x"); Serial.println(finger.system_id, HEX); Serial.print("Capacity: "); Serial.println(finger.capacity); Serial.print("Security level: "); Serial.println(finger.security_level); Serial.print("Device address: "); Serial.println(finger.device_addr, HEX); Serial.print("Packet length: "); Serial.println(finger.packet_len); Serial.print("Baud rate: "); Serial.println(finger.baud_rate); Serial.println(); } |
dashboard.h code
Here is the header file for the project. Create another tab in the Arduino IDE editor window and paste the following code, which contains the complete live voting dashboard webpage.
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#ifndef DASHBOARD_H #define DASHBOARD_H #include <Arduino.h> const char DASHBOARD_HTML[] PROGMEM = R"rawliteral( <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width,initial-scale=1.0"> <title>Fingerprint-Based Electronic Voting Machine</title> <style> :root{--primary:#2563eb;--primary-light:#38bdf8;--primary-dark:#1e3a8a;--accent:#8b5cf6;--bg:#eef2ff;--card:rgba(255,255,255,.94);--text:#0f172a;--muted:#64748b;--line:rgba(148,163,184,.22);--green:#10b981;--red:#ef4444;--amber:#f59e0b;--info:#0ea5e9;--shadow:0 10px 40px rgba(15,23,42,.07);--shadow-lg:0 20px 50px rgba(37,99,235,.12);--glow-inset:0 0 0 1px rgba(255,255,255,.65) inset;--page-margin:10%;--shell-radius:24px;--font:'Segoe UI',system-ui,-apple-system,BlinkMacSystemFont,Roboto,'Helvetica Neue',Arial,sans-serif} *{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;font-family:var(--font);background:#030712;color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility} body::before{content:"";position:fixed;inset:0;background:radial-gradient(ellipse 80% 60% at 10% 15%,rgba(37,99,235,.45),transparent 50%),radial-gradient(ellipse 70% 50% at 90% 8%,rgba(34,211,238,.35),transparent 45%),radial-gradient(ellipse 60% 40% at 50% 95%,rgba(139,92,246,.28),transparent 50%),linear-gradient(160deg,#030712 0%,#0f172a 40%,#172554 100%);z-index:-2} body::after{content:"";position:fixed;inset:0;background:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");opacity:.4;pointer-events:none;z-index:-1} .page-shell{padding:18px var(--page-margin);height:100vh;box-sizing:border-box} .app{display:grid;grid-template-columns:272px 1fr;height:100%;overflow:hidden;border-radius:var(--shell-radius);box-shadow:0 30px 90px rgba(0,0,0,.45),0 0 0 1px rgba(255,255,255,.08),var(--glow-inset);background:rgba(255,255,255,.97);backdrop-filter:blur(24px) saturate(1.2);position:relative} .app::before{content:"";position:absolute;inset:0;border-radius:inherit;background:linear-gradient(135deg,rgba(255,255,255,.4),transparent 40%);pointer-events:none;z-index:0} .app>*{position:relative;z-index:1} .sidebar{background:linear-gradient(165deg,#050a14 0%,#0c1222 40%,#111827 100%);color:#fff;padding:22px 18px;display:flex;flex-direction:column;height:100%;overflow:hidden;border-right:1px solid rgba(255,255,255,.06);position:relative} .sidebar::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,#22d3ee,#2563eb,#7c3aed,#2563eb);background-size:200% 100%;animation:barShift 6s linear infinite} @keyframes barShift{0%{background-position:0% 50%}100%{background-position:200% 50%}} .brand{display:flex;align-items:center;gap:14px;margin-bottom:8px;padding:6px 4px} .logo{width:54px;height:54px;border-radius:18px;background:linear-gradient(145deg,#38bdf8,#2563eb 50%,#4f46e5);display:grid;place-items:center;font-family:var(--font);font-size:.85rem;font-weight:700;letter-spacing:.02em;color:#fff;flex-shrink:0;box-shadow:0 12px 32px rgba(37,99,235,.5),inset 0 1px 0 rgba(255,255,255,.3);position:relative} .logo::after{content:"";position:absolute;inset:-4px;border-radius:22px;border:2px solid rgba(56,189,248,.4);animation:logoRing 3s ease-in-out infinite} @keyframes logoRing{0%,100%{opacity:.35;transform:scale(1)}50%{opacity:1;transform:scale(1.05)}} .brand h1{font-family:var(--font);font-size:1.05rem;margin:0;line-height:1.2;font-weight:700;letter-spacing:0;color:#fff} .brand p{margin:4px 0 0;color:#64748b;font-size:.72rem;line-height:1.4;font-weight:500;letter-spacing:.02em;text-transform:none} .nav-label{font-size:.68rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:#475569;margin:18px 0 8px 12px} .sidebar-nav{display:flex;flex-direction:column;gap:5px} .sidebar-nav button{width:100%;display:flex;align-items:center;gap:11px;background:transparent;color:#94a3b8;border:1px solid transparent;border-radius:14px;padding:12px 14px;font-weight:600;font-size:.875rem;cursor:pointer;text-align:left;transition:all .28s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden} .sidebar-nav button::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:3px;height:0;background:linear-gradient(180deg,#38bdf8,#2563eb);border-radius:0 4px 4px 0;transition:height .28s ease} .sidebar-nav button:hover{color:#f1f5f9;background:rgba(255,255,255,.05);border-color:rgba(255,255,255,.06);padding-left:16px} .sidebar-nav button.active{color:#fff;background:linear-gradient(135deg,rgba(37,99,235,.35),rgba(56,189,248,.12));border-color:rgba(96,165,250,.2);box-shadow:0 8px 28px rgba(37,99,235,.25),inset 0 1px 0 rgba(255,255,255,.08)} .sidebar-nav button.active::before{height:60%} .device-box{margin-top:auto;padding:16px 18px;border-radius:18px;background:linear-gradient(145deg,rgba(255,255,255,.07),rgba(255,255,255,.02));border:1px solid rgba(255,255,255,.08);color:#94a3b8;font-size:.74rem;line-height:1.8;backdrop-filter:blur(12px);box-shadow:inset 0 1px 0 rgba(255,255,255,.06)} .device-box b{color:#e2e8f0;font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;font-weight:700} .dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--red);box-shadow:0 0 14px rgba(239,68,68,.7);vertical-align:middle;margin-left:5px;animation:dotPulse 2s infinite} .dot.ok{background:var(--green);box-shadow:0 0 14px rgba(16,185,129,.7)} @keyframes dotPulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.85)}} .main{padding:22px 28px 24px;min-width:0;overflow:hidden;display:flex;flex-direction:column;height:100%;background:linear-gradient(180deg,#fafbff 0%,#f1f5f9 100%);position:relative} .main::before{content:"";position:absolute;inset:0;background-image:radial-gradient(circle at 1px 1px,rgba(148,163,184,.12) 1px,transparent 0);background-size:24px 24px;pointer-events:none;opacity:.5} .main>*{position:relative;z-index:1} .topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px;flex-wrap:wrap;flex-shrink:0;padding:14px 18px;background:rgba(255,255,255,.72);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);backdrop-filter:blur(12px)} .topbar h2{margin:0;font-family:var(--font);font-size:1.35rem;letter-spacing:0;font-weight:700;color:var(--text)} .topbar p{margin:5px 0 0;color:var(--muted);font-size:.84rem;max-width:640px;line-height:1.45;font-weight:500} .live-pill{display:inline-flex;align-items:center;gap:6px;font-size:.7rem;font-weight:600;text-transform:none;letter-spacing:0;color:#059669;background:linear-gradient(135deg,#ecfdf5,#d1fae5);padding:4px 10px;border-radius:999px;margin-bottom:6px;border:1px solid #a7f3d0} .live-dot{width:6px;height:6px;border-radius:50%;background:#10b981;box-shadow:0 0 10px #10b981;animation:dotPulse 1.5s infinite} .topbar-actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center} .topbar-actions .btn{padding:10px 16px;font-size:.8rem;border-radius:999px} .page{display:none;flex:1;min-height:0;overflow-y:auto} .page.active{display:block} .page.dash-page.active{display:flex;flex-direction:column;overflow:hidden} .main.dash-view .topbar{margin-bottom:12px;padding-bottom:10px} .main.dash-view .topbar h2{font-size:1.25rem} .main.dash-view .topbar p{display:none} .main.dash-view{padding:16px 22px 18px} .card{background:var(--card);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);overflow:hidden;height:100%;display:flex;flex-direction:column;backdrop-filter:blur(16px);transition:transform .3s ease,box-shadow .3s ease} .panel-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)} .dash-page .panel-card:hover{transform:none} .card-header{background:linear-gradient(125deg,#1d4ed8 0%,#2563eb 35%,#0891b2 70%,#06b6d4 100%);color:#fff;padding:14px 20px;font-weight:700;border:none;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;position:relative;overflow:hidden} .card-header::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,.08),transparent);transform:translateX(-100%);animation:headerShine 4s ease-in-out infinite} @keyframes headerShine{0%,100%{transform:translateX(-100%)}50%{transform:translateX(100%)}} .card-header::after{content:"";position:absolute;top:-50%;right:-5%;width:140px;height:140px;background:radial-gradient(circle,rgba(255,255,255,.2),transparent 65%);pointer-events:none} .card-header-title{white-space:nowrap;position:relative;z-index:1;letter-spacing:0;font-family:var(--font);font-size:.95rem;font-weight:600} .card-header-meta{font-size:.72rem;font-weight:600;white-space:nowrap;position:relative;z-index:1;background:rgba(255,255,255,.15);padding:5px 12px;border-radius:999px;border:1px solid rgba(255,255,255,.2);backdrop-filter:blur(4px)} .card-body{padding:20px;flex:1} .stat-card{text-align:left;padding:18px;position:relative;overflow:hidden;border:1px solid var(--line)!important;background:linear-gradient(160deg,rgba(255,255,255,.98),rgba(248,250,252,.9))!important} .stat-card::before{content:"";position:absolute;top:-40px;right:-40px;width:110px;height:110px;border-radius:50%;background:radial-gradient(circle,rgba(37,99,235,.1),transparent 70%);pointer-events:none} .stat-card .stat-icon{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;font-size:1.2rem;margin-bottom:12px;background:#f8fafc;box-shadow:0 6px 16px rgba(15,23,42,.08),inset 0 1px 0 rgba(255,255,255,.8)} .stat-card .value{word-break:break-word;font-size:1.9rem;font-weight:700;color:var(--text);line-height:1;font-variant-numeric:tabular-nums;letter-spacing:0} .stat-card .label{font-size:.68rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);font-weight:600;margin-bottom:8px} .dash-stats .stat-card{text-align:center;padding:16px 14px;transition:transform .25s cubic-bezier(.4,0,.2,1),box-shadow .25s ease} .dash-stats .stat-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)} .dash-stats .stat-card .stat-icon{margin:0 auto 12px} .dash-stats .stat-card.stat-accent-1 .stat-icon{background:linear-gradient(145deg,#dbeafe,#93c5fd);color:#1e40af;box-shadow:0 6px 20px rgba(37,99,235,.2)} .dash-stats .stat-card.stat-accent-2 .stat-icon{background:linear-gradient(145deg,#d1fae5,#6ee7b7);color:#047857;box-shadow:0 6px 20px rgba(16,185,129,.2)} .dash-stats .stat-card.stat-accent-3 .stat-icon{background:linear-gradient(145deg,#fef3c7,#fcd34d);color:#b45309;box-shadow:0 6px 20px rgba(245,158,11,.2)} .dash-stats .stat-card.stat-accent-4 .stat-icon{background:linear-gradient(145deg,#ede9fe,#c4b5fd);color:#6d28d9;box-shadow:0 6px 20px rgba(139,92,246,.2)} .dash-stats .stat-card{padding:16px 14px;border:none!important;box-shadow:var(--shadow)!important} .dash-stats .stat-card.stat-accent-1{box-shadow:0 8px 30px rgba(59,130,246,.12)!important}.dash-stats .stat-card.stat-accent-2{box-shadow:0 8px 30px rgba(16,185,129,.1)!important}.dash-stats .stat-card.stat-accent-3{box-shadow:0 8px 30px rgba(245,158,11,.1)!important}.dash-stats .stat-card.stat-accent-4{box-shadow:0 8px 30px rgba(139,92,246,.1)!important} .dash-stats .stat-card .value{font-size:1.6rem!important} .dash-stats .stat-card .label{font-size:.62rem;margin-bottom:4px} .winner-banner{background:linear-gradient(135deg,rgba(236,253,245,.98),rgba(167,243,208,.85));border:1px solid rgba(110,231,183,.6);border-radius:20px;padding:15px 22px;margin-bottom:16px;color:#064e3b;font-weight:700;font-size:.9rem;line-height:1.45;flex-shrink:0;display:flex;align-items:center;gap:14px;box-shadow:0 12px 36px rgba(16,185,129,.18),inset 0 1px 0 rgba(255,255,255,.6);position:relative;overflow:hidden} .winner-banner::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,.35),transparent);transform:translateX(-100%);animation:headerShine 5s ease-in-out infinite;pointer-events:none} .winner-banner.empty{background:rgba(255,255,255,.85);border-color:var(--line);color:var(--muted);box-shadow:var(--shadow);font-weight:600} .winner-banner.empty::before{display:none} .winner-banner .banner-icon{font-size:1.5rem;flex-shrink:0;filter:drop-shadow(0 2px 6px rgba(16,185,129,.3));position:relative;z-index:1} .winner-banner>span{position:relative;z-index:1} .dash-page .row{gap:14px;margin-bottom:14px} .dash-stats{margin-bottom:12px!important} .dash-stats .stat-card .sub{display:none} .dash-split{display:grid;grid-template-columns:3fr 2fr;gap:16px;flex:1;min-height:0} .dash-split>.card{min-height:0} .dash-split .dash-votes .card-body{display:flex;flex-direction:column;min-height:0;padding:16px 18px;overflow:hidden;background:linear-gradient(180deg,#fafbff,#f8fafc)} .dash-split .card-body{padding:16px 18px;overflow-y:auto} .dash-split .card-header{padding:12px 18px;font-size:.92rem} #voteDistributionPanel,#liveResultsPanel{display:flex;flex-direction:column;gap:12px;flex:1;min-height:0} .candidate-row{padding:15px 18px;border-radius:16px;border:1px solid var(--line);background:rgba(255,255,255,.88);box-shadow:0 4px 16px rgba(15,23,42,.04);transition:all .28s cubic-bezier(.4,0,.2,1);border-left:5px solid transparent;backdrop-filter:blur(8px)} .candidate-row:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(15,23,42,.1)} .candidate-row.cand-0{border-left-color:#3b82f6}.candidate-row.cand-1{border-left-color:#10b981}.candidate-row.cand-2{border-left-color:#06b6d4}.candidate-row.cand-3{border-left-color:#f59e0b} .candidate-row.leading{background:linear-gradient(135deg,rgba(240,253,244,.98),rgba(209,250,229,.6));border-color:rgba(134,239,172,.8);box-shadow:0 12px 36px rgba(16,185,129,.18)} .candidate-main{display:flex;align-items:center;gap:12px;margin-bottom:10px} .cand-badge{width:36px;height:36px;border-radius:12px;display:grid;place-items:center;font-size:.82rem;font-weight:800;color:#fff;flex-shrink:0;box-shadow:0 6px 16px rgba(0,0,0,.18)} .candidate-row.cand-0 .cand-badge{background:linear-gradient(145deg,#60a5fa,#1d4ed8)} .candidate-row.cand-1 .cand-badge{background:linear-gradient(145deg,#34d399,#047857)} .candidate-row.cand-2 .cand-badge{background:linear-gradient(145deg,#22d3ee,#0e7490)} .candidate-row.cand-3 .cand-badge{background:linear-gradient(145deg,#fbbf24,#b45309)} .candidate-name{display:block;font-weight:600;font-size:.9rem;color:var(--text);line-height:1.3;letter-spacing:0;font-family:var(--font)} .candidate-meta{display:block;font-size:.74rem;color:var(--muted);margin-top:3px;font-weight:600} .cand-lead-tag{font-size:.6rem;font-weight:800;text-transform:uppercase;letter-spacing:.08em;padding:6px 11px;border-radius:999px;background:linear-gradient(135deg,#bbf7d0,#86efac);color:#065f46;flex-shrink:0;box-shadow:0 4px 12px rgba(16,185,129,.25)} .progress{height:12px;background:linear-gradient(180deg,#e2e8f0,#f1f5f9);border-radius:999px;overflow:hidden;width:100%;box-shadow:inset 0 2px 4px rgba(15,23,42,.08)} .progress-bar{height:100%;border-radius:999px;position:relative;overflow:hidden;min-width:0;transition:width .6s cubic-bezier(.34,1.2,.64,1);box-shadow:0 0 20px rgba(37,99,235,.35)} .progress-bar:not(.empty)::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,transparent,rgba(255,255,255,.45),transparent);animation:shimmer 2.5s ease-in-out infinite} @keyframes shimmer{0%{transform:translateX(-100%)}100%{transform:translateX(100%)}} .progress-bar.empty{width:0!important;box-shadow:none} .bar-0{background:linear-gradient(90deg,#60a5fa,#2563eb)}.bar-1{background:linear-gradient(90deg,#34d399,#059669)}.bar-2{background:linear-gradient(90deg,#22d3ee,#0891b2)}.bar-3{background:linear-gradient(90deg,#fbbf24,#d97706)} .dash-feed .table-wrap{max-height:none;flex:1;min-height:0;overflow-y:auto;background:#fff} .dash-feed .card-body{display:flex;flex-direction:column;min-height:0;padding:0;background:linear-gradient(180deg,#fafbff,#fff)} .dash-feed table{min-width:0;width:100%;table-layout:fixed} .dash-feed th,.dash-feed td{padding:9px 12px;font-size:.76rem;word-break:break-word} .dash-feed th{font-size:.67rem;text-transform:uppercase;letter-spacing:.06em;font-weight:700;color:#64748b} .dash-feed th:nth-child(1),.dash-feed td:nth-child(1){width:28%} .dash-feed th:nth-child(2),.dash-feed td:nth-child(2){width:22%} .dash-feed thead th{position:sticky;top:0;z-index:1;background:#f8fafc;border-bottom:2px solid var(--line)} .dash-feed tbody tr{transition:background .15s ease} .dash-feed tbody tr:hover{background:#eff6ff} .dash-feed tbody tr:nth-child(even){background:#f8fafc} .dash-feed-footer{padding:10px 14px;font-size:.72rem;color:var(--muted);border-top:1px solid var(--line);flex-shrink:0;background:#fff;font-weight:500} .row{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:16px;margin-bottom:16px;align-items:stretch} .col-3{grid-column:span 3}.col-4{grid-column:span 4}.col-6{grid-column:span 6}.col-8{grid-column:span 8}.col-12{grid-column:span 12} .row>[class*="col-"]{min-width:0} .candidate-info{flex:1;min-width:0} .candidate-head{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:2px} .candidate-votes{font-weight:700;color:var(--primary);font-size:.78rem} .welcome-card{background:linear-gradient(135deg,#fff,#f8fbff);border-radius:20px;padding:22px 24px;margin-bottom:20px;box-shadow:var(--shadow);border:1px solid rgba(37,99,235,.08)} .btn{border:0;border-radius:999px;padding:11px 20px;font-weight:600;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:6px;font-family:var(--font);font-size:.875rem;transition:all .25s cubic-bezier(.4,0,.2,1);letter-spacing:0;position:relative;overflow:hidden} .btn::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(255,255,255,.12),transparent);pointer-events:none} .btn:hover{transform:translateY(-2px);filter:brightness(1.06)} .btn:active{transform:translateY(0) scale(.98)} .btn-primary{background:linear-gradient(135deg,#2563eb,#0891b2);color:#fff;box-shadow:0 10px 28px rgba(37,99,235,.35)} .btn-success{background:linear-gradient(135deg,#10b981,#059669);color:#fff;box-shadow:0 10px 28px rgba(16,185,129,.3)} .btn-danger{background:linear-gradient(135deg,#f87171,#dc2626);color:#fff;box-shadow:0 10px 28px rgba(239,68,68,.3)} .btn-light{background:rgba(255,255,255,.95);color:var(--text);border:1px solid var(--line);box-shadow:0 4px 14px rgba(15,23,42,.06)} .btn-sm{padding:8px 14px;font-size:.78rem} .badge{display:inline-flex;padding:5px 11px;border-radius:999px;font-size:.7rem;font-weight:700;letter-spacing:.02em;box-shadow:0 2px 6px rgba(0,0,0,.06)} .b-vote{background:linear-gradient(135deg,#d1fae5,#a7f3d0);color:#065f46}.b-already{background:linear-gradient(135deg,#fee2e2,#fecaca);color:#991b1b}.b-vote-pending{background:linear-gradient(135deg,#fef3c7,#fde68a);color:#92400e}.b-enrolled{background:linear-gradient(135deg,#ede9fe,#ddd6fe);color:#5b21b6}.b-error{background:linear-gradient(135deg,#fee2e2,#fecaca);color:#991b1b}.b-info{background:linear-gradient(135deg,#e0f2fe,#bae6fd);color:#075985} input,select,textarea{width:100%;border:2px solid var(--line);border-radius:12px;padding:12px 14px;font-size:.92rem;outline:none;background:rgba(255,255,255,.95);font-family:var(--font);transition:border-color .2s ease,box-shadow .2s ease} input:focus,select:focus,textarea:focus{border-color:#60a5fa;box-shadow:0 0 0 4px rgba(37,99,235,.12)} .form-group label{display:block;font-size:.75rem;text-transform:none;letter-spacing:0;color:var(--muted);font-weight:600;margin-bottom:7px} .fingerprint-scan{width:80px;height:80px;border:3px solid transparent;border-radius:50%;margin:0 auto 14px;position:relative;background:linear-gradient(#fff,#fff) padding-box,linear-gradient(135deg,#22d3ee,#2563eb) border-box;box-shadow:0 0 30px rgba(37,99,235,.35);animation:pulse 2s infinite} .fingerprint-scan::before{content:"👆";position:absolute;inset:0;display:grid;place-items:center;font-size:1.6rem;opacity:.85} .fingerprint-scan::after{content:"";position:absolute;width:55%;height:2px;background:linear-gradient(90deg,transparent,#2563eb,transparent);top:50%;left:22%;animation:scan 2.2s infinite linear} @keyframes scan{0%{transform:translateY(-32px);opacity:0}50%{opacity:1}100%{transform:translateY(32px);opacity:0}} @keyframes pulse{0%,100%{box-shadow:0 0 20px rgba(37,99,235,.25)}50%{box-shadow:0 0 35px rgba(34,211,238,.55)}} th,td{padding:12px 16px;border-bottom:1px solid var(--line);text-align:left;font-size:.88rem} th{background:#f8fafc;color:var(--muted);font-weight:700;border-top:none;text-transform:uppercase;font-size:.72rem;letter-spacing:.05em} tbody tr{transition:background .15s ease} tbody tr:hover{background:#eff6ff} .reg-side{text-align:center;padding:22px 18px;background:linear-gradient(165deg,rgba(248,250,252,.95),rgba(239,246,255,.9));border:1px solid var(--line);border-radius:20px;box-shadow:inset 0 1px 0 rgba(255,255,255,.9),0 8px 24px rgba(37,99,235,.06)} .reg-step{padding:9px 14px;border-radius:999px;background:rgba(255,255,255,.8);border:1px solid var(--line);font-size:.78rem;font-weight:700;color:var(--muted);transition:all .2s ease} .reg-step.active{background:linear-gradient(135deg,#dbeafe,#e0f2fe);border-color:#93c5fd;color:#1d4ed8;box-shadow:0 4px 12px rgba(37,99,235,.15)} .reg-step.done{background:linear-gradient(135deg,#d1fae5,#ecfdf5);border-color:#86efac;color:#047857} .live-modal{position:fixed;inset:0;z-index:1000;display:none;align-items:center;justify-content:center;padding:22px;background:rgba(3,7,18,.65);backdrop-filter:blur(16px) saturate(1.2)} .live-modal.show{display:flex;animation:fadeIn .25s ease} @keyframes fadeIn{from{opacity:0}to{opacity:1}} .live-card{width:min(540px,96vw);background:rgba(255,255,255,.98);border-radius:28px;box-shadow:0 30px 90px rgba(0,0,0,.35);padding:32px 34px;text-align:center;border:none;animation:popIn .4s cubic-bezier(.34,1.4,.64,1);backdrop-filter:blur(20px);position:relative;overflow:hidden} .live-card::before{content:"";position:absolute;top:0;left:0;right:0;height:5px;background:linear-gradient(90deg,#2563eb,#06b6d4,#8b5cf6)} @keyframes popIn{from{opacity:0;transform:scale(.9) translateY(16px)}to{opacity:1;transform:scale(1) translateY(0)}} .live-card h2{font-family:var(--font);font-weight:700;letter-spacing:0} .banner{position:fixed;right:22px;top:22px;z-index:1001;width:min(420px,calc(100vw - 44px));display:none;background:rgba(255,255,255,.97);border-radius:18px;border:none;box-shadow:0 20px 50px rgba(15,23,42,.2);padding:18px 20px 18px 24px;backdrop-filter:blur(16px);animation:slideIn .4s cubic-bezier(.34,1.3,.64,1);overflow:hidden} .banner::before{content:"";position:absolute;left:0;top:0;bottom:0;width:5px;background:linear-gradient(180deg,#2563eb,#06b6d4)} .banner.success::before{background:linear-gradient(180deg,#10b981,#059669)}.banner.error::before{background:linear-gradient(180deg,#ef4444,#dc2626)}.banner.info::before{background:linear-gradient(180deg,#0ea5e9,#2563eb)} .banner.show{display:block}.banner.success,.banner.error,.banner.info{border-left:none} ::-webkit-scrollbar{width:7px;height:7px} ::-webkit-scrollbar-track{background:transparent} ::-webkit-scrollbar-thumb{background:linear-gradient(180deg,#cbd5e1,#94a3b8);border-radius:999px} .stat-card .sub{font-size:.72rem;color:var(--muted);margin-top:4px} .modal-icon{width:68px;height:68px;border-radius:50%;display:grid;place-items:center;font-size:1.75rem;margin:0 auto 18px;font-weight:800;line-height:1;box-shadow:0 10px 28px rgba(0,0,0,.1)} .modal-icon.success{background:linear-gradient(135deg,#dcfce7,#bbf7d0);color:#15803d} .modal-icon.error{background:linear-gradient(135deg,#fee2e2,#fecaca);color:#b91c1c} .modal-icon.info{background:linear-gradient(135deg,#dbeafe,#bfdbfe);color:#1d4ed8} .modal-icon.warning{background:linear-gradient(135deg,#fef3c7,#fde68a);color:#b45309} .live-card.modal-success{border-top-color:var(--green)}.live-card.modal-error{border-top-color:var(--red)}.live-card.modal-info{border-top-color:var(--info)}.live-card.modal-warning{border-top-color:var(--amber)} .live-card h2{margin:0 0 8px;font-size:1.25rem;color:var(--text)} .live-card p{color:var(--muted);line-height:1.55;margin:0 0 16px;font-size:.92rem;font-weight:500} .detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:4px;text-align:left} .detail.hidden{display:none} .detail span{display:block;color:var(--muted);font-size:.7rem;text-transform:uppercase;font-weight:700;margin-bottom:4px;letter-spacing:.05em} .detail strong{display:block;font-size:.92rem;color:var(--text);word-break:break-word;font-weight:700} .status-badge{display:inline-flex;padding:5px 10px;border-radius:999px;font-size:.76rem;font-weight:700;background:#f1f5f9;color:var(--muted)} .status-badge.ok{background:linear-gradient(135deg,#d1fae5,#a7f3d0);color:#047857}.status-badge.bad{background:linear-gradient(135deg,#fee2e2,#fecaca);color:#991b1b} .form-group{margin-bottom:14px} textarea{min-height:72px;resize:vertical} .form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px} .form-grid .full{grid-column:span 2} .table-wrap{overflow-x:auto;overflow-y:auto;max-height:420px;-webkit-overflow-scrolling:touch} table{width:100%;border-collapse:collapse;min-width:640px;table-layout:auto} .progress-table .progress{min-width:120px} tr.leading-row td{background:#f0fdf4} .welcome-card h2{margin:0 0 6px;font-size:1.35rem;color:var(--text);font-weight:700} .welcome-card p{margin:0;color:var(--muted);line-height:1.5;max-width:900px} .panel-card{transition:transform .25s ease,box-shadow .25s ease} .sensor-note{background:linear-gradient(135deg,#eff6ff,#dbeafe);border:1px solid #bfdbfe;border-radius:14px;padding:12px 16px;margin-bottom:14px;font-size:.88rem;color:#1e3a8a} .toolbar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:16px} .register-warning{display:none;background:linear-gradient(135deg,#fffbeb,#fef3c7);border:1px solid #fde68a;color:#92400e;padding:11px 14px;border-radius:12px;margin:12px 0 0;font-size:.88rem;font-weight:600} .register-warning.show{display:block} .register-steps{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px} .vote-activity-item{padding:11px 14px;border-left:4px solid transparent;border-radius:12px;margin-bottom:8px;background:rgba(248,250,252,.9);transition:all .28s ease;font-size:.86rem;line-height:1.45;word-break:break-word;border:1px solid var(--line);border-left-width:4px} .vote-activity-item:hover{background:#eff6ff;border-left-color:var(--primary);transform:translateX(3px);box-shadow:0 4px 16px rgba(37,99,235,.08)} .actions-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px} .action-tile{text-align:center;padding:22px 16px;cursor:pointer;border:1px solid var(--line);border-radius:18px;background:rgba(255,255,255,.92);transition:all .28s cubic-bezier(.4,0,.2,1);height:100%;backdrop-filter:blur(8px)} .action-tile:hover{transform:translateY(-3px);box-shadow:0 14px 32px rgba(15,23,42,.1);border-color:rgba(37,99,235,.2)} .action-icon{font-size:1.9rem;margin-bottom:10px;line-height:1;filter:drop-shadow(0 2px 8px rgba(0,0,0,.08))} .action-tile h4{margin:0 0 6px;font-size:.95rem;font-family:var(--font);font-weight:600} .action-tile p{margin:0;color:var(--muted);font-size:.82rem;line-height:1.4;min-height:2.8em} .action-tile .btn-go{margin-top:12px;background:linear-gradient(135deg,var(--primary),var(--primary-light));color:#fff;border:0;border-radius:999px;padding:9px 16px;font-weight:700;cursor:pointer;font-size:.82rem;width:100%;max-width:180px;pointer-events:none;box-shadow:0 6px 18px rgba(37,99,235,.25)} .action-tile.danger .btn-go{background:linear-gradient(135deg,#f87171,var(--red))} .detail{border:1px solid var(--line);background:linear-gradient(180deg,#fff,#f8fafc);border-radius:14px;padding:11px 13px;transition:transform .15s ease} .detail:hover{transform:translateY(-1px)} @keyframes slideIn{from{opacity:0;transform:translateX(24px)}to{opacity:1;transform:translateX(0)}} .results-toolbar-meta{font-size:.78rem;color:var(--muted);font-weight:600;background:rgba(255,255,255,.7);padding:6px 12px;border-radius:999px;border:1px solid var(--line)} .page.active{animation:pageIn .35s ease} @keyframes pageIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}} .reg-stats .stat-card{padding:12px 10px;text-align:center;border-top:3px solid transparent;transition:transform .2s ease} .reg-stats .stat-card:hover{transform:translateY(-3px)} .reg-stats .stat-card .stat-icon{width:32px;height:32px;border-radius:9px;display:grid;place-items:center;font-size:1rem;margin:0 auto 8px;background:#f1f5f9} .reg-stats .stat-card.stat-accent-1{border-top-color:#3b82f6}.reg-stats .stat-card.stat-accent-1 .stat-icon{background:#dbeafe;color:#1d4ed8} .reg-stats .stat-card.stat-accent-2{border-top-color:#22c55e}.reg-stats .stat-card.stat-accent-2 .stat-icon{background:#dcfce7;color:#15803d} .reg-stats .stat-card.stat-accent-3{border-top-color:#f59e0b}.reg-stats .stat-card.stat-accent-3 .stat-icon{background:#fef3c7;color:#b45309} .reg-stats .stat-card.stat-accent-4{border-top-color:#8b5cf6}.reg-stats .stat-card.stat-accent-4 .stat-icon{background:#ede9fe;color:#6d28d9} .reg-stats .stat-card .value{font-size:1.5rem} .reg-stats .stat-card .label{font-size:.65rem} .reg-side .register-steps{flex-direction:column;align-items:stretch;margin-bottom:0} .reg-side .reg-step{text-align:center} .reg-card .card-body{padding:20px 22px} .reg-layout{display:grid;grid-template-columns:220px 1fr;gap:22px;align-items:start} .reg-side .fingerprint-scan{margin:0 auto 14px} .reg-hint{font-size:.82rem;color:var(--muted);margin:6px 0 14px;line-height:1.45} .reg-form-wrap{min-width:0} .reg-toolbar{margin-top:4px;padding-top:4px} .reg-page .row{margin-bottom:12px} .results-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:14px} .results-toolbar .toolbar{margin-bottom:0} .res-page .dash-split{margin-bottom:14px} .res-results-card{margin-bottom:14px} .res-results-card .card-body{background:linear-gradient(180deg,#fafbff,#f8fafc);padding:16px 18px} .res-history-card{margin-top:0} .res-history-card .card-body{padding:0} .res-history-card .table-wrap{max-height:360px} .res-history-card th,.res-history-card td{font-size:.82rem;padding:10px 12px} .res-history-card tbody tr:nth-child(even){background:#f8fafc} .res-page .progress-table .card-body{padding:14px 16px;background:#fafbfc} .records-page .row{margin-bottom:12px} .records-card .card-body{padding:0} .records-card .table-wrap{max-height:480px} .records-card th,.records-card td{font-size:.82rem;padding:10px 12px} .records-card tbody tr:nth-child(even){background:#f8fafc} .records-card tbody tr{transition:background .15s ease} .records-card tbody tr:hover{background:#eff6ff} .records-card thead th{position:sticky;top:0;z-index:1;background:#f8fafc} .main.dash-view .live-pill{display:none} @media(max-height:760px){.page-shell{padding:10px 8%}.main.dash-view{padding:12px 16px 14px}.main.dash-view .topbar h2{font-size:1.1rem}.dash-stats .stat-card{padding:10px 8px}.dash-stats .stat-card .value{font-size:1.3rem!important}.winner-banner{padding:8px 12px;font-size:.8rem;margin-bottom:8px}.dash-split .card-header{padding:9px 12px}.dash-split .card-body{padding:10px 12px}.candidate-row{padding:8px 10px}.progress{height:8px}.dash-feed th,.dash-feed td{padding:6px 8px;font-size:.7rem}} @media(max-width:992px){:root{--page-margin:5%}.page-shell{padding:10px var(--page-margin);height:auto;min-height:100vh}.app{grid-template-columns:1fr;height:auto;min-height:calc(100vh - 20px);overflow:visible;border-radius:14px}.main{height:auto;overflow:visible}.page.dash-page.active{display:block;overflow:visible}.dash-split{grid-template-columns:1fr}.dash-votes .card-body{overflow-y:auto}.sidebar{position:sticky;top:0;z-index:50;padding:16px;height:auto;overflow:visible}.sidebar-nav{flex-direction:row;flex-wrap:wrap}.sidebar-nav button{width:auto;flex:1 1 calc(50% - 4px);justify-content:center;font-size:.82rem;padding:10px 8px}.device-box{margin-top:12px}.col-3,.col-4,.col-6,.col-8{grid-column:span 12}.actions-grid{grid-template-columns:1fr}} @media(max-width:560px){:root{--page-margin:3%}.main{padding:14px 12px 24px}.topbar{flex-direction:column}.topbar-actions{width:100%}.topbar-actions .btn{flex:1}.form-grid{grid-template-columns:1fr}.form-grid .full{grid-column:span 1}} </style> </head> <body> <div class="page-shell"> <div class="app"> <aside class="sidebar"> <div class="brand"> <div class="logo">VT</div> <div><h1>VoteTrack Pro</h1><p>Biometric election hub</p></div> </div> <div class="nav-label">Menu</div> <nav class="sidebar-nav"> <button class="active" onclick="showPage('dashboard',this)">📊 Dashboard</button> <button onclick="showPage('register',this)">➕ Enroll Voter</button> <button onclick="showPage('history',this)">📈 Live Results</button> <button onclick="showPage('records',this)">👥 Voter Management</button> </nav> <div class="device-box"> <b>ESP32 Dashboard</b><br> WiFi: <span id="wifiText">Checking...</span> <span id="wifiDot" class="dot"></span><br> IP: <span id="ipText">--</span><br> Last update: <span id="apiTime">--</span> </div> </aside> <main class="main dash-view"> <header class="topbar"> <div> <span class="live-pill"><span class="live-dot"></span> Live</span> <h2 id="pageTitle">Voting Dashboard</h2> <p id="pageSubtitle">Live fingerprint voting, candidate results, and voter records.</p> </div> <div class="topbar-actions"> <button class="btn btn-light" id="soundToggleBtn" onclick="toggleSound()">🔇 Enable Sound</button> <button class="btn btn-success" onclick="exportVotesCsv()">Export Votes CSV</button> <button class="btn btn-danger" onclick="resetElection()">Reset Election</button> </div> </header> <section id="page-dashboard" class="page dash-page active"> <div id="winnerAnnouncement" class="winner-banner empty"><span class="banner-icon">📊</span><span>No votes cast yet. Waiting for the first vote...</span></div> <div class="row dash-stats"> <div class="col-3"><div class="card stat-card stat-accent-1"><div class="stat-icon">👥</div><div class="label">Total Voters</div><div class="value" id="dashTotalVoters">--</div></div></div> <div class="col-3"><div class="card stat-card stat-accent-2"><div class="stat-icon">🗳️</div><div class="label">Votes Cast</div><div class="value" id="dashVotesCast">0</div></div></div> <div class="col-3"><div class="card stat-card stat-accent-3"><div class="stat-icon">📈</div><div class="label">Turnout</div><div class="value" id="dashTurnout">0%</div></div></div> <div class="col-3"><div class="card stat-card stat-accent-4"><div class="stat-icon">🏆</div><div class="label">Leading</div><div class="value" id="dashLeading" style="font-size:1.05rem">--</div></div></div> </div> <div class="dash-split"> <div class="card panel-card dash-votes"> <div class="card-header"><span class="card-header-title">Vote Distribution</span><span class="card-header-meta" id="lastUpdated">--</span></div> <div class="card-body" id="voteDistributionPanel">Loading results...</div> </div> <div class="card panel-card dash-feed"> <div class="card-header"><span class="card-header-title">Live Activity</span><button class="btn btn-light btn-sm" style="background:rgba(255,255,255,.2);color:#fff;border:0" onclick="refreshNow(true)">Refresh</button></div> <div class="card-body"> <div class="table-wrap"><table><thead><tr><th>Time</th><th>Event</th><th>Voter</th><th>Candidate</th></tr></thead><tbody id="liveBody"></tbody></table></div> <div id="debugStrip" class="dash-feed-footer">Waiting for dashboard data...</div> </div> </div> </div> </section> <section id="page-register" class="page reg-page"> <div class="row reg-stats"> <div class="col-3"><div class="card stat-card stat-accent-1"><div class="stat-icon">👥</div><div class="label">Total Enrolled</div><div class="value" id="totalEnrolled">--</div></div></div> <div class="col-3"><div class="card stat-card stat-accent-2"><div class="stat-icon">🗳️</div><div class="label">Votes Cast</div><div class="value" id="totalVotes">0</div></div></div> <div class="col-3"><div class="card stat-card stat-accent-3"><div class="stat-icon">🏆</div><div class="label">Leading</div><div class="value" id="leadingCandidate" style="font-size:1.05rem">--</div></div></div> <div class="col-3"><div class="card stat-card stat-accent-4"><div class="stat-icon">🔢</div><div class="label">Next ID</div><div class="value" id="nextId">--</div></div></div> </div> <div class="card reg-card"> <div class="card-header"><span class="card-header-title">Voter Enrollment</span><span class="card-header-meta">Dashboard registration</span></div> <div class="card-body"> <div class="reg-layout"> <div class="reg-side"> <div class="fingerprint-scan"></div> <strong id="registerStatusText">Ready</strong> <p class="reg-hint">Fill in voter details, then start registration and scan on the R503 sensor.</p> <div class="register-steps"> <div class="reg-step active" id="regStepInfo">1. Voter Details</div> <div class="reg-step" id="regStepScan">2. Finger Scan</div> <div class="reg-step" id="regStepSave">3. Save Record</div> </div> </div> <div class="reg-form-wrap"> <div class="form-grid"> <div class="form-group"><label>Name</label><input id="enrollName" placeholder="Full name" autocomplete="name"></div> <div class="form-group"><label>ID No</label><input id="enrollIdNo" placeholder="Voter ID number"></div> <div class="form-group"><label>Date of Birth</label><input type="date" id="enrollDob"></div> <div class="form-group"><label>Sex</label><select id="enrollSex"><option value="">Select sex</option><option value="Male">Male</option><option value="Female">Female</option></select></div> <div class="form-group full"><label>City</label><input id="enrollCity" placeholder="City"></div> </div> <div id="registerWarning" class="register-warning">Please fill in Name, ID No, Date of Birth, Sex, and City before starting registration.</div> <div class="toolbar reg-toolbar"> <button class="btn btn-success" onclick="startEnroll()">Start Registration</button> <button class="btn btn-light" onclick="clearRegisterForm()">Clear Form</button> <button class="btn btn-danger" onclick="cancelEnroll()">Cancel Enrollment</button> </div> </div> </div> </div> </div> </section> <section id="page-history" class="page res-page"> <div id="resWinnerAnnouncement" class="winner-banner empty"><span class="banner-icon">📊</span><span>No votes cast yet. Waiting for the first vote...</span></div> <div class="row dash-stats"> <div class="col-3"><div class="card stat-card stat-accent-1"><div class="stat-icon">👥</div><div class="label">Total Voters</div><div class="value" id="resTotalVoters">--</div></div></div> <div class="col-3"><div class="card stat-card stat-accent-2"><div class="stat-icon">🗳️</div><div class="label">Votes Cast</div><div class="value" id="resVotesCast">0</div></div></div> <div class="col-3"><div class="card stat-card stat-accent-3"><div class="stat-icon">📈</div><div class="label">Turnout</div><div class="value" id="resTurnout">0%</div></div></div> <div class="col-3"><div class="card stat-card stat-accent-4"><div class="stat-icon">🏆</div><div class="label">Leading</div><div class="value" id="resLeading" style="font-size:1.05rem">--</div></div></div> </div> <div class="card panel-card res-results-card"> <div class="card-header"><span class="card-header-title">Live Results</span><span class="card-header-meta" id="resLastUpdated">Updated --</span></div> <div class="card-body" id="liveResultsPanel">Loading results...</div> </div> <div class="card panel-card res-history-card"> <div class="card-header"><span class="card-header-title">Vote History</span><span class="card-header-meta">Recorded votes only</span></div> <div class="card-body"> <div class="table-wrap"><table><thead><tr><th>Time</th><th>Voter</th><th>ID No</th><th>Finger ID</th><th>Candidate</th><th>Message</th></tr></thead><tbody id="historyBody"></tbody></table></div> </div> </div> </section> <section id="page-records" class="page records-page"> <div class="row dash-stats"> <div class="col-3"><div class="card stat-card stat-accent-1"><div class="stat-icon">👥</div><div class="label">Registered</div><div class="value" id="recRegistered">--</div></div></div> <div class="col-3"><div class="card stat-card stat-accent-2"><div class="stat-icon">🗳️</div><div class="label">Voted</div><div class="value" id="recVoted">0</div></div></div> <div class="col-3"><div class="card stat-card stat-accent-3"><div class="stat-icon">⏳</div><div class="label">Not Voted</div><div class="value" id="recPending">0</div></div></div> <div class="col-3"><div class="card stat-card stat-accent-4"><div class="stat-icon">🔢</div><div class="label">Next ID</div><div class="value" id="recNextId">--</div></div></div> </div> <div class="card panel-card records-card"> <div class="card-header"><span class="card-header-title">Registered Voters</span><span class="card-header-meta"><span id="recLastUpdated">Updated --</span> · <span id="registeredCount">--</span> on file</span></div> <div class="card-body"> <div class="table-wrap"><table><thead><tr><th>Finger ID</th><th>Name</th><th>ID No</th><th>DOB</th><th>Sex</th><th>City</th><th>Status</th><th>Actions</th></tr></thead><tbody id="recordsBody"></tbody></table></div> </div> </div> </section> </main> </div> </div> <div id="banner" class="banner"><strong id="bannerTitle">Message</strong><div id="bannerText" style="font-size:.88rem;color:var(--muted);margin-top:4px">Details</div></div> <div id="liveModal" class="live-modal"><div id="liveCard" class="live-card modal-info"><div id="modalIcon" class="modal-icon info">ℹ</div><h2 id="modalTitle">Notice</h2><p id="modalMessage">Action completed.</p><div class="detail-grid"><div class="detail" id="modalFieldName"><span>Name</span><strong id="modalName">-</strong></div><div class="detail" id="modalFieldId"><span>Finger ID</span><strong id="modalId">-</strong></div><div class="detail" id="modalFieldIdNo"><span>ID No</span><strong id="modalIdNo">-</strong></div><div class="detail" id="modalFieldDob"><span>Date of Birth</span><strong id="modalDob">-</strong></div><div class="detail" id="modalFieldSex"><span>Sex</span><strong id="modalSex">-</strong></div><div class="detail" id="modalFieldCity"><span>City</span><strong id="modalCity">-</strong></div><div class="detail" id="modalFieldCandidate"><span>Candidate</span><strong id="modalCandidate">-</strong></div><div class="detail" id="modalFieldEvent"><span>Status</span><strong id="modalEvent">-</strong></div></div><div style="margin-top:18px"><button class="btn btn-primary" onclick="closeModal()">Done</button></div></div></div> <script> let state={},logs=[],registeredFingerprints=[],lastSeenKey="",firstLoad=true,soundEnabled=false,modalTimer=null; const CAND_COLORS=["bar-0","bar-1","bar-2","bar-3"]; function showPage(name,btn){ document.querySelectorAll(".page").forEach(p=>p.classList.remove("active")); document.getElementById("page-"+name).classList.add("active"); document.querySelectorAll(".sidebar-nav button").forEach(b=>b.classList.remove("active")); if(btn)btn.classList.add("active"); const mainEl=document.querySelector(".main"); if(mainEl)mainEl.classList.toggle("dash-view",name==="dashboard"); if(name==="dashboard"){pageTitle.textContent="Voting Dashboard";pageSubtitle.textContent="Live fingerprint voting, candidate results, and voter records."} else if(name==="register"){pageTitle.textContent="Enroll Voter";pageSubtitle.textContent="Register voters with fingerprint scan on the R503 sensor."} else if(name==="history"){pageTitle.textContent="Live Results";pageSubtitle.textContent="Real-time vote distribution and election analytics."} else{pageTitle.textContent="Voter Management";pageSubtitle.textContent="View, refresh, and delete enrolled voters."} } async function api(path,options={}){const res=await fetch(path,options);if(!res.ok){const txt=await res.text();throw new Error(txt||("HTTP "+res.status))}return res.json()} function toggleSound(){soundEnabled=!soundEnabled;const btn=document.getElementById("soundToggleBtn");if(soundEnabled){if(btn)btn.textContent="🔊 Disable Sound";beep("info")}else{if(btn)btn.textContent="🔇 Enable Sound"}} function beep(type="info"){if(!soundEnabled)return;try{const C=window.AudioContext||window.webkitAudioContext;const ctx=new C();const osc=ctx.createOscillator();const gain=ctx.createGain();osc.connect(gain);gain.connect(ctx.destination);osc.frequency.value=type==="success"?880:type==="error"?180:520;gain.gain.setValueAtTime(.0001,ctx.currentTime);gain.gain.exponentialRampToValueAtTime(.15,ctx.currentTime+.02);gain.gain.exponentialRampToValueAtTime(.0001,ctx.currentTime+.18);osc.start();osc.stop(ctx.currentTime+.2)}catch(e){}} function showBanner(type,title,text){bannerTitle.textContent=title;bannerText.textContent=text||"";banner.className="banner show "+(type==="success"?"success":type==="error"?"error":type==="info"?"info":"");setTimeout(()=>banner.className="banner",4500)} function modalIconChar(type){if(type==="success")return"✓";if(type==="error")return"✕";if(type==="warning")return"!";return"ℹ"} function normalizeModalData(data={}){return{name:data.name||"",id:data.id,collegeId:data.collegeId||data.idNo||"",note:data.note||data.dob||"",role:data.role||data.sex||"",department:data.department||data.city||"",candidate:data.candidate||"",event:data.event||""}} function getEnrollFormData(){return{name:(enrollName?.value||"").trim(),collegeId:(enrollIdNo?.value||"").trim(),note:(enrollDob?.value||""),role:(enrollSex?.value||""),department:(enrollCity?.value||"").trim(),id:-1}} function setModalFields(fields,data){const map={name:["modalFieldName","modalName"],id:["modalFieldId","modalId",v=>v>=0?String(v):"-"],idNo:["modalFieldIdNo","modalIdNo"],dob:["modalFieldDob","modalDob"],sex:["modalFieldSex","modalSex"],city:["modalFieldCity","modalCity"],candidate:["modalFieldCandidate","modalCandidate"],event:["modalFieldEvent","modalEvent"]};Object.keys(map).forEach(key=>{const[fieldId,valueId,fmt]=map[key];const wrap=document.getElementById(fieldId);const el=document.getElementById(valueId);const show=fields.includes(key);let val="";if(key==="name")val=data.name||"-";else if(key==="id")val=fmt?fmt(data.id):data.id;else if(key==="idNo")val=data.collegeId||"-";else if(key==="dob")val=data.note||"-";else if(key==="sex")val=data.role||"-";else if(key==="city")val=data.department||"-";else if(key==="candidate")val=data.candidate||"-";else if(key==="event")val=data.event||"-";if(wrap){wrap.classList.toggle("hidden",!show);if(show&&el)el.textContent=val||"-"}})} function showModal(type,title,message,data={},options={}){const d=normalizeModalData(data);const fields=options.fields||["name","id","idNo","dob","sex","city"];liveCard.className="live-card modal-"+(type||"info");modalIcon.className="modal-icon "+(type||"info");modalIcon.textContent=modalIconChar(type||"info");modalTitle.textContent=title||"Notice";modalMessage.textContent=message||"";setModalFields(fields,d);liveModal.classList.add("show");if(modalTimer)clearTimeout(modalTimer);modalTimer=setTimeout(()=>closeModal(),options.autoCloseMs||8000)} function closeModal(){liveModal.classList.remove("show");if(modalTimer){clearTimeout(modalTimer);modalTimer=null}} function eventType(event){event=(event||"").toUpperCase();if(event==="VOTE")return"vote";if(event.includes("ALREADY VOTED"))return"already";if(event.includes("VOTE PENDING"))return"vote-pending";if(event.includes("VOTE TIMEOUT"))return"vote-timeout";if(event.includes("DUPLICATE"))return"duplicate";if(event.includes("NOT FOUND"))return"not-found";if(event.includes("ENROLLED"))return"enrolled";if(event.includes("ENROLL REQUEST"))return"enroll-request";if(event.includes("ENROLL"))return"enroll";if(event.includes("RESET"))return"reset";if(event.includes("CANCEL"))return"cancel";if(event.includes("ERROR"))return"error";return"info"} function eventBadge(event){const t=eventType(event);if(t==="vote")return"b-vote";if(t==="already")return"b-already";if(t==="vote-pending")return"b-vote-pending";if(t==="duplicate")return"b-already";if(t==="vote-timeout")return"b-error";if(t==="enrolled")return"b-enrolled";if(t==="error"||t==="not-found")return"b-error";return"b-info"} function eventKey(l){if(!l)return"";return[l.time,l.event,l.id,l.message,l.candidate].join("|")} function personName(l){return l.name||(l.id>=0?("ID "+l.id):"System")} function escapeHtml(v){return String(v??"").replace(/[&<>"']/g,ch=>({"&":"&","<":"<",">":">","\"":""","'":"'"}[ch]))} function getVoterTurnout(){const voters=Number(state.templates||0);const votes=Number(state.totalVotes||0);return voters>0?Math.round((votes/voters)*100):0} function getLeadingInfo(){const counts=state.voteCounts||[0,0,0,0];const names=state.candidates||["Candidate 1","Candidate 2","Candidate 3","Candidate 4"];let max=-1,leader="--",leadVotes=0;counts.forEach((c,i)=>{const n=Number(c||0);if(n>max){max=n;leader=names[i]||("Candidate "+(i+1));leadVotes=n}});return{leader:max>0?leader:"--",leadVotes,max}} function handleNewEvent(l){if(!l)return;const ev=(l.event||"").toUpperCase();const type=eventType(l.event);const name=personName(l);const msg=l.message||"";const cand=l.candidate||"";const data=normalizeModalData(l);if(type==="enrolled"){setRegisterStep(3);if(registerStatusText)registerStatusText.textContent="Saved successfully";showBanner("success","Registration Successful",name+" has been enrolled.");showModal("success","Registration Successful","Fingerprint saved and voter record created.",{...data,event:"Registered Successfully"},{fields:["name","id","idNo","dob","sex","city","event"],autoCloseMs:9000});beep("success")}else if(type==="vote"){showBanner("success","Voting Successful",name+" voted for "+(cand||"selected candidate")+".");showModal("success","Voting Successful","The vote was recorded successfully.",{...data,candidate:cand||data.candidate,event:"Vote Recorded"},{fields:["name","id","idNo","candidate","city"],autoCloseMs:9000});beep("success")}else if(type==="already"){showBanner("error","Already Voted",name+" has already voted in this election.");showModal("error","Already Voted","This voter cannot cast another vote.",{...data,event:"Already Voted"},{fields:["name","id","idNo","sex","city"],autoCloseMs:9000});beep("error")}else if(type==="vote-pending"){showBanner("info","Select Candidate",name+" verified — press a candidate button now.");showModal("info","Select Candidate Button","Press D5, D18, D19, or D23 within 15 seconds.",{...data,event:"Awaiting Button"},{fields:["name","id","idNo","city"],autoCloseMs:7000});beep("info")}else if(type==="vote-timeout"){showBanner("error","Vote Timed Out",name+" did not select a candidate in time.");showModal("error","Selection Timed Out","No candidate button was pressed in time. Scan again to vote.",{...data,event:"Timed Out"},{fields:["name","id","idNo"],autoCloseMs:9000});beep("error")}else if(type==="duplicate"){setRegisterStep(1);if(registerStatusText)registerStatusText.textContent="Duplicate detected";showBanner("error","Duplicate Registration","This fingerprint is already enrolled on the sensor.");showModal("error","Duplicate Registration","Scan a different finger or delete the existing record first.",{...data,event:"Duplicate Fingerprint"},{fields:["id","name","idNo","sex","city"],autoCloseMs:9000});beep("error")}else if(type==="not-found"){showBanner("error","Fingerprint Not Found",msg||"No matching voter was found.");showModal("error","Fingerprint Not Found",msg||"This fingerprint is not registered in the system.",{event:"Not Found",message:msg},{fields:["event"],autoCloseMs:8000});beep("error")}else if(type==="error"){const scanAgain=msg.toLowerCase().includes("not clear")||msg.toLowerCase().includes("could not read");if(registerStatusText)registerStatusText.textContent=scanAgain?"Scan again":"Needs attention";if(scanAgain)setRegisterStep(2);showBanner("error",scanAgain?"Scan Again":"Action Failed",msg||"Please try again.");showModal("error",scanAgain?"Scan Again":"Action Failed",scanAgain?"Place the same finger flat on the sensor and hold still.":(msg||"Please try again."),{...data,event:l.event||"Error"},{fields:scanAgain?["event"]:["name","idNo","event"],autoCloseMs:9000});beep("error")}else if(type==="enroll"){setRegisterStep(2);if(registerStatusText)registerStatusText.textContent="Scanning finger";const form=getEnrollFormData();showBanner("info","Scan Fingerprint","Place finger on the R503 sensor.");showModal("info","Scan Fingerprint","Complete fingerprint capture on the sensor.",{...form,...data,event:"Scan Required"},{fields:["name","idNo","dob","sex","city","event"],autoCloseMs:8000});beep("info")}else if(type==="enroll-request"){showBanner("info","Enrollment Queued","Waiting for fingerprint scan on the sensor.");beep("info")}else if(type==="reset"){showBanner("info","Election Reset","All votes have been cleared.");showModal("info","Election Reset","Vote counts reset. Every voter may vote again.",{event:"Election Reset"},{fields:["event"],autoCloseMs:7000});beep("info")}else if(type==="cancel"){setRegisterStep(1);if(registerStatusText)registerStatusText.textContent="Cancelled";showBanner("info","Enrollment Cancelled","Registration was cancelled.");showModal("warning","Enrollment Cancelled","You can fill the form and start again when ready.",{event:"Cancelled"},{fields:["event"],autoCloseMs:6000});beep("info")}} function updateRecordsStats(){const people=buildPeopleRecords();const voted=people.filter(p=>p.status==="Voted").length;const registered=people.length;const pending=Math.max(registered-voted,0);if(recRegistered)recRegistered.textContent=registered;if(recVoted)recVoted.textContent=voted;if(recPending)recPending.textContent=pending;if(recNextId)recNextId.textContent=state.nextId??"--";if(registeredCount)registeredCount.textContent=registered} function statusBadgeClass(status){if(status==="Voted")return"b-vote";if(status==="Registered")return"b-enrolled";return"b-info"} function buildPeopleRecords(){const people={};registeredFingerprints.forEach(fp=>{const id=Number(fp.id);if(id<0)return;people[id]={id:id,name:fp.name||"",collegeId:fp.collegeId||"",role:fp.role||"",department:fp.department||"",dob:fp.dob||"",status:fp.name||fp.collegeId?"Registered":"Unassigned"}});logs.forEach(l=>{const id=Number(l.id);if(id<0||!people[id])return;if(l.name)people[id].name=l.name;if(l.collegeId)people[id].collegeId=l.collegeId;if(l.role)people[id].role=l.role;if(l.department)people[id].department=l.department;const ev=(l.event||"").toUpperCase();if(ev.includes("ENROLLED"))people[id].status="Registered";if(ev==="VOTE")people[id].status="Voted"});return Object.values(people).sort((a,b)=>a.id-b.id)} function buildVoteLog(){return logs.filter(l=>(l.event||"").toUpperCase()==="VOTE").slice().reverse().map(l=>({time:l.time||"",name:l.name||("ID "+l.id),collegeId:l.collegeId||"-",id:l.id,candidate:l.candidate||"-",message:l.message||""}))} function renderCandidatePanels(containerId,tableId){const el=document.getElementById(containerId);if(!el)return;const counts=state.voteCounts||[0,0,0,0];const names=state.candidates||["Candidate 1","Candidate 2","Candidate 3","Candidate 4"];const total=counts.reduce((a,b)=>a+Number(b||0),0);const lead=getLeadingInfo().leader;let html="";names.forEach((name,i)=>{const votes=Number(counts[i]||0);const pct=total>0?((votes/total)*100).toFixed(1):"0.0";const isLead=name===lead&&total>0;const barWidth=votes>0?Math.max(parseFloat(pct),8):0;html+=`<div class="candidate-row cand-${i%4} ${isLead?"leading":""}"><div class="candidate-main"><span class="cand-badge">${i+1}</span><div class="candidate-info"><span class="candidate-name">${escapeHtml(name)}</span><span class="candidate-meta">${votes} vote${votes===1?"":"s"} · ${pct}%</span></div>${isLead?'<span class="cand-lead-tag">Leading</span>':""}</div><div class="progress"><div class="progress-bar bar-${i%4} ${votes?"":"empty"}" style="width:${barWidth}%"></div></div></div>`});el.innerHTML=html||"<div style='color:var(--muted);text-align:center;padding:20px'>No votes yet.</div>";const tb=document.getElementById(tableId);if(tb){tb.innerHTML=names.map((name,i)=>{const votes=Number(counts[i]||0);const pct=total>0?((votes/total)*100).toFixed(1):"0.0";const isLead=name===lead&&total>0;const barWidth=votes>0?Math.max(parseFloat(pct),10):0;return `<tr class="${isLead?"leading-row":""}"><td>${escapeHtml(name)}</td><td>${votes}</td><td>${pct}%</td><td><div class="progress"><div class="progress-bar bar-${i%4} ${votes?"":"empty"}" style="width:${barWidth}%"></div></div></td><td>${isLead?"Leading":"-"}</td></tr>`}).join("")}} function renderWinnerBanner(){const info=getLeadingInfo();const total=Number(state.totalVotes||0);const turnout=getVoterTurnout();const emptyHtml='<span class="banner-icon">📊</span><span>No votes cast yet. Waiting for the first vote...</span>';const leadHtml=`<span class="banner-icon">🏆</span><span><strong>${escapeHtml(info.leader)}</strong> is leading with ${info.leadVotes} votes (${total>0?Math.round((info.leadVotes/total)*100):0}% of total) · Turnout: ${turnout}%</span>`;["winnerAnnouncement","resWinnerAnnouncement"].forEach(id=>{const el=document.getElementById(id);if(!el)return;if(total===0){el.className="winner-banner empty";el.innerHTML=emptyHtml}else{el.className="winner-banner";el.innerHTML=leadHtml}})} function renderLiveTicker(){const el=document.getElementById("liveTicker");if(!el)return;const items=logs.slice().reverse().slice(0,12);if(!items.length){el.innerHTML="<div class='vote-activity-item'>No activity yet.</div>";return}el.innerHTML=items.map(l=>`<div class="vote-activity-item"><strong>${escapeHtml(l.time||"")}</strong> — <span class="badge ${eventBadge(l.event)}">${escapeHtml(l.event||"INFO")}</span> ${escapeHtml(personName(l))}${l.candidate?" → "+escapeHtml(l.candidate):""}</div>`).join("")} function renderSystemStatus(){const wifi=!!state.wifi;const wifiEl=document.getElementById("wifiStatus");const sensorEl=document.getElementById("sensorStatus");const deviceEl=document.getElementById("deviceStatus");const wifiTextEl=document.getElementById("wifiText");const wifiDotEl=document.getElementById("wifiDot");if(wifiTextEl)wifiTextEl.textContent=wifi?"Connected":"Offline";if(wifiDotEl)wifiDotEl.className="dot "+(wifi?"ok":"");if(wifiEl){wifiEl.textContent=wifi?"Connected":"Offline";wifiEl.className="status-badge "+(wifi?"ok":"bad")}if(sensorEl){sensorEl.textContent=state.sensor||"Ready";sensorEl.className="status-badge ok"}if(deviceEl){deviceEl.textContent=wifi?"Online":"Offline";deviceEl.className="status-badge "+(wifi?"ok":"bad")}} function renderTables(){const onDash=document.getElementById("page-dashboard")?.classList.contains("active");const liveRows=logs.slice().reverse().map(l=>onDash?`<tr><td>${escapeHtml(l.time||"")}</td><td><span class="badge ${eventBadge(l.event)}">${escapeHtml(l.event||"INFO")}</span></td><td>${escapeHtml(l.name||"-")}</td><td>${escapeHtml(l.candidate||"-")}</td></tr>`:`<tr><td>${escapeHtml(l.time||"")}</td><td><span class="badge ${eventBadge(l.event)}">${escapeHtml(l.event||"INFO")}</span></td><td>${l.id>=0?l.id:"-"}</td><td>${escapeHtml(l.name||"-")}</td><td>${escapeHtml(l.candidate||"-")}</td><td>${escapeHtml(l.message||"")}</td></tr>`).join("");if(liveBody)liveBody.innerHTML=liveRows||`<tr><td colspan="${onDash?4:6}">No logs yet.</td></tr>`;const historyRows=buildVoteLog().map(r=>`<tr><td>${escapeHtml(r.time)}</td><td>${escapeHtml(r.name)}</td><td>${escapeHtml(r.collegeId)}</td><td>${r.id}</td><td>${escapeHtml(r.candidate)}</td><td>${escapeHtml(r.message)}</td></tr>`).join("");if(historyBody)historyBody.innerHTML=historyRows||`<tr><td colspan="6">No votes recorded yet.</td></tr>`;const peopleRows=buildPeopleRecords().map(p=>`<tr><td>${p.id}</td><td>${escapeHtml(p.name||"-")}</td><td>${escapeHtml(p.collegeId||"-")}</td><td>${escapeHtml(p.dob||"-")}</td><td>${escapeHtml(p.role||"-")}</td><td>${escapeHtml(p.department||"-")}</td><td><span class="badge ${statusBadgeClass(p.status)}">${escapeHtml(p.status)}</span></td><td><button class="btn btn-danger btn-sm" onclick="deleteFingerprint(${p.id})">Delete</button></td></tr>`).join("");if(recordsBody)recordsBody.innerHTML=peopleRows||`<tr><td colspan="8">No registered voters yet.</td></tr>`;updateRecordsStats();renderCandidatePanels("voteDistributionPanel");renderCandidatePanels("liveResultsPanel");renderWinnerBanner();renderLiveTicker();renderSystemStatus();const lu=document.getElementById("lastUpdated");if(lu)lu.textContent="Updated "+new Date().toLocaleTimeString();const ru=document.getElementById("resLastUpdated");if(ru)ru.textContent="Updated "+new Date().toLocaleTimeString();const rc=document.getElementById("recLastUpdated");if(rc)rc.textContent="Updated "+new Date().toLocaleTimeString()} function csvEscape(v){v=String(v??"");return '"'+v.replace(/"/g,'""')+'"'} function exportVotesCsv(){const rows=buildVoteLog();if(!rows.length){showBanner("error","No Vote Data","No votes to export yet.");return}let csv="time,voter,college_id,fingerprint_id,candidate,message ";rows.slice().reverse().forEach(r=>{csv+=[csvEscape(r.time),csvEscape(r.name),csvEscape(r.collegeId),csvEscape(r.id),csvEscape(r.candidate),csvEscape(r.message)].join(",")+" "});const blob=new Blob([csv],{type:"text/csv;charset=utf-8;"});const url=URL.createObjectURL(blob);const a=document.createElement("a");a.href=url;a.download="election_results_"+new Date().toISOString().split("T")[0]+".csv";document.body.appendChild(a);a.click();document.body.removeChild(a);URL.revokeObjectURL(url);showBanner("success","Export Complete","Election results exported.")} async function resetElection(){if(!confirm("Reset the entire election? This clears all vote counts and allows every voter to vote again."))return;try{await api("/api/reset-votes",{method:"POST"});showBanner("success","Election Reset","All votes cleared.");beep("success");refreshNow()}catch(e){showBanner("error","Reset Failed",e.message);beep("error")}} function updateStatusUi(){const wifi=!!state.wifi;const voters=state.templates??"--";const votes=state.totalVotes??0;const turnout=getVoterTurnout()+"%";const leader=getLeadingInfo().leader;if(ipText)ipText.textContent=state.ip||"--";if(apiTime)apiTime.textContent=new Date().toLocaleTimeString();if(wifiText)wifiText.textContent=wifi?"Connected":"Offline";if(wifiDot)wifiDot.className="dot "+(wifi?"ok":"");["dashTotalVoters","resTotalVoters","totalEnrolled"].forEach(id=>{const el=document.getElementById(id);if(el)el.textContent=voters});["dashVotesCast","resVotesCast","totalVotes"].forEach(id=>{const el=document.getElementById(id);if(el)el.textContent=votes});["dashTurnout","resTurnout"].forEach(id=>{const el=document.getElementById(id);if(el)el.textContent=turnout});["dashLeading","resLeading","leadingCandidate"].forEach(id=>{const el=document.getElementById(id);if(el)el.textContent=leader});if(nextId)nextId.textContent=state.nextId??"--";if(debugStrip)debugStrip.innerHTML="Logs: <b>"+logs.length+"</b> | Votes: <b>"+votes+"</b> | Turnout: <b>"+turnout+"</b> | Enrolling: <b>"+(state.isEnrolling?"YES":"NO")+"</b> | Selecting: <b>"+(state.isSelectingVote?"YES":"NO")+"</b>";if(state.isEnrolling){setRegisterStep(2);if(registerStatusText)registerStatusText.textContent="Scanning finger"}} function setRegisterStep(step){const info=document.getElementById("regStepInfo");const scan=document.getElementById("regStepScan");const save=document.getElementById("regStepSave");if(!info||!scan||!save)return;[info,scan,save].forEach(el=>{el.classList.remove("active","done")});if(step===1)info.classList.add("active");else if(step===2){info.classList.add("done");scan.classList.add("active")}else if(step===3){info.classList.add("done");scan.classList.add("done");save.classList.add("active")}} function clearRegisterForm(){if(enrollName)enrollName.value="";if(enrollIdNo)enrollIdNo.value="";if(enrollDob)enrollDob.value="";if(enrollSex)enrollSex.value="";if(enrollCity)enrollCity.value="";const warn=document.getElementById("registerWarning");if(warn)warn.classList.remove("show");setRegisterStep(1);if(registerStatusText)registerStatusText.textContent="Ready"} function validateRegisterForm(){const name=(enrollName?.value||"").trim();const idNo=(enrollIdNo?.value||"").trim();const dob=(enrollDob?.value||"").trim();const sex=(enrollSex?.value||"").trim();const city=(enrollCity?.value||"").trim();const warn=document.getElementById("registerWarning");if(!name||!idNo||!dob||!sex||!city){if(warn)warn.classList.add("show");showBanner("error","Missing Details","Enter Name, ID No, Date of Birth, Sex, and City.");return false}if(warn)warn.classList.remove("show");return true} async function refreshNow(forcePopup=false){try{const newState=await api("/api/status");const logData=await api("/api/logs");let regData={fingerprints:[]};try{regData=await api("/api/registered")}catch(e){regData={fingerprints:[]}}state=newState||{};logs=logData.logs||[];registeredFingerprints=regData.fingerprints||[];updateStatusUi();renderTables();const latest=state.last||logs[logs.length-1]||null;const key=eventKey(latest);if(firstLoad){firstLoad=false;lastSeenKey=key;if(latest&&forcePopup)handleNewEvent(latest);return}if((forcePopup&&latest)||(key&&key!==lastSeenKey)){lastSeenKey=key;handleNewEvent(latest)}}catch(e){if(debugStrip)debugStrip.innerHTML="Dashboard API error: <b>"+e.message+"</b>";showBanner("error","API Error",e.message)}} async function startEnroll(){if(!validateRegisterForm())return;const form=getEnrollFormData();const payload=new URLSearchParams();payload.append("name",form.name);payload.append("collegeId",form.collegeId);payload.append("role",form.role);payload.append("department",form.department);payload.append("note",form.note);try{setRegisterStep(2);if(registerStatusText)registerStatusText.textContent="Scanning finger";showBanner("info","Enrollment Started","Place finger on the R503 sensor.");beep("info");await api("/api/enroll",{method:"POST",headers:{"Content-Type":"application/x-www-form-urlencoded"},body:payload});setTimeout(()=>refreshNow(),500)}catch(e){setRegisterStep(1);if(registerStatusText)registerStatusText.textContent="Failed";showBanner("error","Enrollment Failed",e.message);showModal("error","Enrollment Failed",e.message,{...form,event:"Failed"},{fields:["name","idNo","event"],autoCloseMs:9000});beep("error")}} async function cancelEnroll(){try{await api("/api/cancel",{method:"POST"});showBanner("info","Cancelled","Enrollment cancelled.");refreshNow()}catch(e){showBanner("error","Cancel Failed",e.message)}} async function deleteFingerprint(id){if(!id)return;if(!confirm("Delete fingerprint ID "+id+" and remove this voter record?"))return;try{await api("/api/fingerprint?id="+encodeURIComponent(id),{method:"DELETE"});showBanner("success","Deleted","Voter ID "+id+" removed.");beep("success");refreshNow()}catch(e){showBanner("error","Delete Failed",e.message);beep("error")}} setRegisterStep(1);refreshNow();setInterval(refreshNow,1000); </script> </body> </html> )rawliteral"; #endif |
Testing & Demo of ESP32 Fingerprint Voting Machine
After completing the hardware connection and uploading the code, the ESP32 fingerprint voting machine is ready for testing.
When the device is powered on, the OLED display first shows the Wi-Fi connection status.
Once the ESP32 connects to the local Wi-Fi network, it displays the IP address on the OLED screen. This IP address can be opened in a web browser to access the live voting dashboard.
After Wi-Fi connection, the system checks the R503 fingerprint sensor. During this step, the OLED shows a checking message while the ESP32 communicates with the fingerprint module.
If the sensor is detected successfully, the OLED displays “Sensor Ready”, which means the fingerprint module is properly connected and ready for scanning.
Finally, the system enters scan mode. In this mode, the OLED displays “Place finger” and waits for a registered voter to scan before accepting a candidate button vote.
Accessing the Dashboard
After the ESP32 connects to the Wi-Fi network, it displays its local IP address on the OLED screen. In this demo, the IP address shown is 192.168.2.112. By entering this IP address in a web browser on a phone, laptop, or computer connected to the same Wi-Fi network, we can access the VoteTrack Pro live voting dashboard.
The dashboard page shows live election stats, vote distribution, Wi-Fi connection, latest update time, and live activity feed. From the left-side menu, we can open Dashboard, Enroll Voter, Live Results, and Voter Management.
The Enroll Voter page is used to add voter details such as name, ID number, date of birth, sex, and city, and then start fingerprint enrollment.
The Live Results page shows current vote counts, leading candidate, and vote history, while the Voter Management page displays registered voters and their voting status.
The dashboard also includes options to enable sound alerts, export vote data as a CSV file, and reset the election when required.
Registering Voters
To register a new voter, open the ESP32 web dashboard and go to the Enroll Voter section. Here, enter the voter details such as name, ID number, date of birth, sex, and city, then click the Start Registration button.
After starting the registration, the dashboard shows an “Enrollment Started” popup and the OLED display asks the user to place a finger on the R503 fingerprint sensor.
The sensor first captures the fingerprint image, then asks the user to remove the finger and place the same finger again for the second scan.
The OLED display shows the enrollment progress step by step, such as placing the finger, removing the finger, scanning again, and saving the fingerprint.
Once both scans are matched successfully, the fingerprint template is saved in the R503 sensor memory and the user details are stored in the ESP32.
The OLED display shows a success message, and the dashboard also displays a “Registration Successful” popup with the voter name, fingerprint ID, ID number, and other saved details.
If the same registered finger is scanned again during the registration process, the system detects it as a duplicate fingerprint.
After this, the registered voter can scan their finger and cast one vote during the election.
Casting a Vote
After voter registration, the system can be used to conduct the election.
When a registered voter places their finger on the R503 fingerprint sensor, the OLED display shows that the system is searching and verifying the fingerprint.
If the fingerprint matches a saved voter record and that voter has not voted yet, the ESP32 opens a voting window and asks the voter to press one of the four candidate buttons.
When the voter selects a candidate, the dashboard displays a vote success popup with the voter name, fingerprint ID, ID number, and selected candidate. The vote is saved immediately and shown in the live results panel.
If the same voter scans again after already voting, the system blocks duplicate voting and displays an “Already Voted” message on the OLED and dashboard.
If an unknown or unregistered finger is scanned, the OLED display shows a try again or search failed message.
This means the fingerprint is not found in the saved voter database. The dashboard also keeps updating the live activity feed, vote history, turnout, and registered voter records.
In the Live Results section, vote counts, percentages, leading candidate, and vote history are shown with voter name, ID number, fingerprint ID, candidate, and message.
The Voter Management section shows all registered voters along with their assigned fingerprint IDs, voting status, and delete option.
Apart from voter enrollment and vote casting, the dashboard also includes useful election management features. In the Voter Management section, all registered voters are listed with fingerprint ID, name, ID number, date of birth, sex, city, and voting status. If any voter record needs to be removed, the administrator can click the Delete button, and the ESP32 deletes that fingerprint ID from the R503 sensor memory as well as removes the saved voter details from the system.
The dashboard also provides an Export Votes CSV option and a Reset Election button. Exported vote data can be opened in Excel or Google Sheets for result analysis and record keeping.
Video Tutorial & Guide
I Built an ESP32 Fingerprint Voting Machine with Live Web Dashboard
