Overview
In this IoT project, we will learn how to build a Fingerprint Biometric Attendance System using ESP32, R503 Fingerprint Sensor, 0.96” OLED Display, and a professional web dashboard. The ESP32 Wi-Fi module is used to connect the system to a local network and host a real-time dashboard directly from the device. The R503 fingerprint sensor is used to enroll and verify users, while the OLED display shows system status, scan instructions, user name, entry status, exit status, and registration messages.
This ESP32-based biometric attendance system allows users to register their fingerprint along with personal details such as name, college ID, role, and department. Once a registered fingerprint is scanned, the system automatically marks the user’s attendance and updates the dashboard with entry and exit records. The dashboard displays live attendance activity, registered user records, fingerprint IDs, login time, logout time, and attendance history. The attendance data can also be exported as a CSV file for use in Excel or record-keeping.
The professional dashboard makes this project more advanced by providing a user-friendly interface for fingerprint registration, attendance monitoring, record management, and fingerprint deletion. This project is a practical and low-cost solution for building a smart biometric attendance system with real-time monitoring and secure user verification.
Overview
Following are the components required to making ESP32 Fingerprint Attendance System. 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 Biometric Attendance System
Let’s take a look at the block diagram of the ESP32-based Fingerprint Biometric Attendance System.
In this system, the R503 fingerprint sensor works as the input device and sends fingerprint data to the ESP32 for processing and verification. After the fingerprint is verified, the ESP32 displays the result on the OLED screen and updates the web dashboard for real-time attendance monitoring.
The dashboard can show registered users, entry and exit records, attendance history, and other important details in a simple and organized way.
Circuit Diagram
Let’s take a look at the schematic of the ESP32-based Fingerprint Biometric Attendance System.
In this circuit, the ESP32 works as the main controller and is connected with the R503 fingerprint sensor, OLED display, and push buttons. The R503 fingerprint sensor communicates with the ESP32 through UART pins, while the OLED display uses the I2C pins for showing scan status, user name, entry, exit, and system messages.
The push buttons are connected as input controls and can be used for functions like enrollment, cancel, or other menu actions. But in this project, we are not using the push 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 Attendance System 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, PMS7003, BME680 Air Quality Monitor 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 Attendance System
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, and Fingerprint sensor, I used female header pins. This makes it easy to remove or replace the modules later if needed.
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 the all the modules and completed the final assembly of the IoT ESP32 Fingerprint Attendance System 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 attendance 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, enrollment requests, and button inputs. When a registered finger is scanned, the ESP32 verifies the fingerprint, marks entry or exit, shows the user’s first name on the OLED, and updates the attendance records on the dashboard. New users can also be registered from the dashboard by entering their name, college ID, role, and department.
The code is divided into two main parts: the main .ino file for ESP32 control and the dashboard.h file for the 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); // ===================================================== // BUTTONS // ===================================================== #define BTN_ENROLL 18 #define BTN_CANCEL 5 #define DEBOUNCE_MS 250 unsigned long lastEnrollBtnTime = 0; unsigned long lastCancelBtnTime = 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 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 entryCount = 0; int exitCount = 0; int lastEntryId = -1; bool insideState[MAX_FINGERPRINTS + 1]; // 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); AttendanceLog getLogByDisplayIndex(int i); 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); bool enrollButtonPressed(); bool cancelButtonPressed(); 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); pinMode(BTN_ENROLL, INPUT); pinMode(BTN_CANCEL, INPUT); for (int i = 0; i <= MAX_FINGERPRINTS; i++) { insideState[i] = false; } prefs.begin("fps_db", false); 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", "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(); if ((enrollButtonPressed() || dashboardEnrollRequest) && !isEnrolling) { 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 (cancelButtonPressed() && !isEnrolling) { oledScanScreen(); smartDelay(300); } if (!isEnrolling) { 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 += "\"message\":\"" + jsonEscape(l.message) + "\""; lastJson += "}"; } String lastEntryJson = "null"; if (lastEntryId >= 1) { PersonProfile p = loadProfile(lastEntryId); lastEntryJson = "{"; lastEntryJson += "\"id\":" + String(lastEntryId) + ","; lastEntryJson += "\"name\":\"" + jsonEscape(p.name) + "\","; lastEntryJson += "\"collegeId\":\"" + jsonEscape(p.collegeId) + "\","; lastEntryJson += "\"department\":\"" + jsonEscape(p.department) + "\","; lastEntryJson += "\"message\":\"Last entry\""; lastEntryJson += "}"; } 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 += "\"entryCount\":" + String(entryCount) + ","; json += "\"exitCount\":" + String(exitCount) + ","; json += "\"isEnrolling\":" + String(isEnrolling ? "true" : "false") + ","; json += "\"sensor\":\"Ready\","; json += "\"last\":" + lastJson + ","; json += "\"lastEntry\":" + lastEntryJson; 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 += "\"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); if (id >= 0 && id <= MAX_FINGERPRINTS) { insideState[id] = false; } 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,message\n"; 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.message + "\"\n"; } server.sendHeader("Content-Disposition", "attachment; filename=attendance_logs.csv"); server.send(200, "text/csv", csv); }); 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()); } // ===================================================== // 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", "\\n"); s.replace("\r", ""); 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) { logs[logWriteIndex].timeText = uptimeText(); logs[logWriteIndex].event = event; logs[logWriteIndex].id = id; logs[logWriteIndex].message = message; logs[logWriteIndex].name = ""; logs[logWriteIndex].collegeId = ""; logs[logWriteIndex].role = ""; logs[logWriteIndex].department = ""; 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; } 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 MODE"); drawMiniFingerprint(8, 22); display.setTextSize(1); display.setTextColor(SSD1306_WHITE, SSD1306_BLACK); display.setCursor(56, 24); display.print("Place finger"); 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; } bool enrollButtonPressed() { if (buttonPressed(BTN_ENROLL, lastEnrollBtnTime)) { while (digitalRead(BTN_ENROLL) == LOW) { server.handleClient(); delay(10); } return true; } return false; } bool cancelButtonPressed() { if (buttonPressed(BTN_CANCEL, lastCancelBtnTime)) { while (digitalRead(BTN_CANCEL) == LOW) { server.handleClient(); delay(10); } return true; } return false; } bool checkCancelDuringEnroll() { server.handleClient(); if (buttonPressed(BTN_CANCEL, lastCancelBtnTime) || cancelEnroll) { cancelEnroll = true; while (digitalRead(BTN_CANCEL) == LOW) { server.handleClient(); delay(10); } 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); } if (id >= 1 && id <= MAX_FINGERPRINTS) { if (insideState[id] == false) { insideState[id] = true; entryCount++; lastEntryId = id; addLog("ENTRY", id, logName + " entered"); oledSuccessAnimation("Entry", displayName); } else { insideState[id] = false; exitCount++; addLog("EXIT", id, logName + " exited"); oledSuccessAnimation("Exit", displayName); } } else { addLog("MATCH", id, logName + " matched"); oledSuccessAnimation("Matched", displayName); } smartDelay(1500); waitForFingerRemove(); 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; } } // ===================================================== // 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 += "}"; 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. You need to create another tab on Arduino IDE editor window and paste the following code that consist of webpage files.
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#ifndef DASHBOARD_H #define DASHBOARD_H #include <Arduino.h> const char DASHBOARD_HTML[] PROGMEM = R"rawliteral( <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width,initial-scale=1.0"> <title>Fingerprint Attendance Dashboard</title> <style> :root{--bg:#eef3fb;--card:#fff;--text:#0f172a;--muted:#64748b;--line:#dbe3ef;--blue:#2563eb;--green:#16a34a;--red:#dc2626;--amber:#f59e0b;--dark:#0f172a;--shadow:0 20px 60px rgba(15,23,42,.12)} *{box-sizing:border-box} body{margin:0;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;background:radial-gradient(circle at 0% 0%,rgba(37,99,235,.13),transparent 30rem),radial-gradient(circle at 100% 0%,rgba(22,163,74,.10),transparent 28rem),var(--bg);color:var(--text)} .app{display:grid;grid-template-columns:270px 1fr;min-height:100vh} .sidebar{background:#0f172a;color:#fff;padding:24px 18px} .brand{display:flex;align-items:center;gap:12px;margin-bottom:28px} .logo{width:48px;height:48px;border-radius:16px;background:linear-gradient(135deg,#38bdf8,#2563eb);display:grid;place-items:center;font-size:26px;box-shadow:0 16px 34px rgba(37,99,235,.35)} .brand h1{font-size:19px;margin:0;line-height:1.1}.brand p{margin:4px 0 0;color:#94a3b8;font-size:12px} .nav button{width:100%;display:flex;gap:10px;align-items:center;background:transparent;color:#cbd5e1;border:0;border-radius:14px;padding:13px 14px;font-weight:800;cursor:pointer;margin:6px 0;text-align:left} .nav button:hover,.nav button.active{background:rgba(255,255,255,.12);color:#fff} .device{margin-top:28px;padding:16px;border-radius:18px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.10);color:#cbd5e1;font-size:13px;line-height:1.7} .dot{display:inline-block;width:10px;height:10px;border-radius:50%;background:var(--red);box-shadow:0 0 0 5px rgba(220,38,38,.12)}.dot.ok{background:var(--green);box-shadow:0 0 0 5px rgba(22,163,74,.14)} .main{padding:28px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px}.topbar h2{margin:0;font-size:34px;letter-spacing:-.04em}.topbar p{margin:6px 0 0;color:var(--muted)} .actions{display:flex;gap:10px;flex-wrap:wrap} button,.btn{border:0;border-radius:14px;padding:12px 16px;font-weight:900;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px} .btn-primary{background:var(--blue);color:white}.btn-green{background:var(--green);color:white}.btn-red{background:var(--red);color:white}.btn-mini-red{background:var(--red);color:white;border-radius:10px;padding:8px 10px;font-size:12px}.btn-mini-red:hover{background:#b91c1c} .btn-dark{background:var(--dark);color:white}.btn-soft{background:white;color:var(--text);border:1px solid var(--line)} .grid{display:grid;grid-template-columns:repeat(12,1fr);gap:18px}.card{background:var(--card);border:1px solid rgba(255,255,255,.65);border-radius:24px;box-shadow:var(--shadow);overflow:hidden}.pad{padding:20px} .metric{grid-column:span 3}.metric small{display:block;color:var(--muted);font-weight:900;text-transform:uppercase;letter-spacing:.1em;margin-bottom:10px}.metric strong{display:block;font-size:38px;letter-spacing:-.05em}.metric span{color:var(--muted);font-size:13px} .hero{grid-column:span 12;min-height:260px;background:linear-gradient(135deg,#0f172a,#1e3a8a 55%,#2563eb);color:#fff}.control{grid-column:span 4} .hero-inner{display:flex;align-items:center;gap:28px;height:100%}.finger{width:150px;height:150px;border-radius:42px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.18);display:grid;place-items:center;position:relative;overflow:hidden;flex:0 0 auto} .finger:before{content:"";position:absolute;left:20px;right:20px;height:4px;border-radius:999px;background:#22c55e;box-shadow:0 0 24px rgba(34,197,94,.8);animation:scan 1.3s linear infinite}@keyframes scan{0%{top:22px}50%{top:124px}100%{top:22px}} .finger .icon{font-size:74px;z-index:1}.hero h3{font-size:32px;margin:0 0 8px;letter-spacing:-.04em}.hero p{margin:0;color:#cbd5e1;line-height:1.6} .pills{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.pill{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.12);border-radius:999px;padding:8px 11px;font-size:13px;color:#e2e8f0;font-weight:800} .form-group{margin-bottom:13px}.form-group label{display:block;font-size:12px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);font-weight:900;margin-bottom:6px} input,select,textarea{width:100%;border:1px solid var(--line);border-radius:14px;padding:12px 13px;font-size:14px;outline:none;background:#fff}textarea{min-height:72px;resize:vertical}input:focus,select:focus,textarea:focus{border-color:var(--blue);box-shadow:0 0 0 4px rgba(37,99,235,.12)} .table-card{grid-column:span 12}.table-header{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:18px 20px;border-bottom:1px solid var(--line);flex-wrap:wrap}.table-header h3{margin:0}.table-header p{margin:4px 0 0;color:var(--muted);font-size:13px} .table-wrap{overflow:auto;max-height:460px}table{width:100%;border-collapse:collapse;min-width:850px}th,td{padding:14px 18px;border-bottom:1px solid var(--line);text-align:left;font-size:14px}th{background:#f8fafc;color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.08em}tbody tr:hover{background:#f8fafc} .badge{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;border-radius:999px;font-size:12px;font-weight:900}.b-entry{background:#dcfce7;color:#166534}.b-exit{background:#dbeafe;color:#1e40af}.b-enrolled{background:#ede9fe;color:#5b21b6}.b-error{background:#fee2e2;color:#991b1b}.b-info{background:#fef3c7;color:#92400e} .status-strip{margin-top:16px;padding:12px 14px;border-radius:16px;background:#f8fafc;border:1px solid var(--line);color:var(--muted);font-size:13px}.page{display:none}.page.active{display:block} .live-modal{position:fixed;inset:0;z-index:1000;display:none;align-items:center;justify-content:center;padding:22px;background:rgba(15,23,42,.40);backdrop-filter:blur(10px)}.live-modal.show{display:flex;animation:fadeIn .18s ease} .live-card{width:min(560px,96vw);background:white;border-radius:32px;box-shadow:0 40px 110px rgba(15,23,42,.35);padding:34px;text-align:center;position:relative;overflow:hidden}.live-card:before{content:"";position:absolute;width:210px;height:210px;border-radius:50%;right:-80px;top:-90px;background:rgba(22,163,74,.12)}.live-card.error:before{background:rgba(220,38,38,.12)}.live-card.info:before{background:rgba(37,99,235,.12)} .big-icon{width:118px;height:118px;border-radius:50%;margin:0 auto 18px;display:grid;place-items:center;font-size:56px;font-weight:950;color:white;background:var(--green);position:relative;animation:pop .34s ease}.live-card.error .big-icon{background:var(--red)}.live-card.info .big-icon{background:var(--blue)} .big-icon:after{content:"";position:absolute;inset:-10px;border-radius:50%;border:3px solid rgba(22,163,74,.20);animation:pulse 1.25s ease infinite}.live-card.error .big-icon:after{border-color:rgba(220,38,38,.20)}.live-card.info .big-icon:after{border-color:rgba(37,99,235,.20)} .live-card h2{margin:0 0 8px;font-size:32px;letter-spacing:-.05em}.live-card p{margin:0;color:var(--muted);line-height:1.6} .detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:20px;text-align:left}.detail{border:1px solid var(--line);background:#f8fafc;border-radius:16px;padding:12px 14px}.detail span{display:block;color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.08em;font-weight:900;margin-bottom:4px}.detail strong{color:var(--text)} .confetti{position:absolute;width:8px;height:14px;border-radius:3px;animation:fall 1.35s ease forwards}@keyframes fadeIn{from{opacity:0}to{opacity:1}}@keyframes pop{from{transform:scale(.72);opacity:0}to{transform:scale(1);opacity:1}}@keyframes pulse{from{transform:scale(.9);opacity:1}to{transform:scale(1.25);opacity:0}}@keyframes fall{from{transform:translateY(-100px) rotate(0deg);opacity:1}to{transform:translateY(260px) rotate(260deg);opacity:0}} .banner{position:fixed;right:22px;top:22px;z-index:1001;width:min(430px,calc(100vw - 44px));display:none;align-items:center;gap:14px;background:white;border-radius:22px;border:1px solid var(--line);border-left:6px solid var(--blue);box-shadow:0 24px 70px rgba(15,23,42,.20);padding:16px 18px}.banner.show{display:flex;animation:slide .2s ease}.banner.success{border-left-color:var(--green)}.banner.error{border-left-color:var(--red)}.banner-icon{width:48px;height:48px;border-radius:16px;display:grid;place-items:center;background:#eff6ff;color:var(--blue);font-size:24px;font-weight:950}.banner.success .banner-icon{background:#dcfce7;color:var(--green)}.banner.error .banner-icon{background:#fee2e2;color:var(--red)}.banner strong{display:block;margin-bottom:3px}.banner span{display:block;color:var(--muted);font-size:13px;line-height:1.35}@keyframes slide{from{transform:translateY(-12px);opacity:0}to{transform:translateY(0);opacity:1}} /* ===== Improved Register Fingerprint UI ===== */ .register-layout{ display:grid; grid-template-columns:1fr; gap:10px; grid-column:span 12; } .register-hero-card{ background: radial-gradient(circle at 12% 0%,rgba(37,99,235,.16),transparent 36%), linear-gradient(135deg,#ffffff,#f8fbff); border:1px solid rgba(255,255,255,.78); border-radius:28px; box-shadow:var(--shadow); overflow:hidden; } .register-head{ display:flex; align-items:center; justify-content:space-between; gap:16px; padding:16px 20px; border-bottom:1px solid var(--line); } .register-title-wrap{ display:flex; align-items:center; gap:14px; } .register-icon{ width:56px; height:56px; border-radius:18px; display:grid; place-items:center; background:linear-gradient(135deg,#2563eb,#38bdf8); color:white; font-size:28px; box-shadow:0 16px 36px rgba(37,99,235,.22); } .register-head h2{ margin:0; font-size:26px; letter-spacing:-.04em; } .register-head p{ margin:5px 0 0; color:var(--muted); line-height:1.45; } .enroll-status-pill{ display:inline-flex; align-items:center; gap:8px; border-radius:999px; background:#eff6ff; color:#1d4ed8; border:1px solid #bfdbfe; padding:9px 12px; font-size:13px; font-weight:900; white-space:nowrap; } .enroll-status-dot{ width:9px; height:9px; border-radius:50%; background:#2563eb; box-shadow:0 0 0 5px rgba(37,99,235,.12); } .register-steps{ display:grid; grid-template-columns:repeat(3,1fr); gap:10px; padding:12px 20px 0; } .reg-step{ display:flex; align-items:center; gap:10px; padding:12px; border-radius:16px; border:1px solid var(--line); background:#f8fafc; color:var(--muted); font-size:13px; font-weight:900; } .reg-step-num{ width:28px; height:28px; border-radius:10px; display:grid; place-items:center; background:#e2e8f0; color:#475569; } .reg-step.active{ background:#eff6ff; color:#1d4ed8; border-color:#bfdbfe; } .reg-step.active .reg-step-num{ background:#2563eb; color:white; } .reg-step.done{ background:#f0fdf4; color:#166534; border-color:#bbf7d0; } .reg-step.done .reg-step-num{ background:#16a34a; color:white; } .register-form{ padding:14px 20px 18px; } .form-grid-register{ display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:10px; } .form-group.full{ grid-column:1/-1; } .input-with-icon{ position:relative; } .input-with-icon .field-icon{ position:absolute; left:13px; top:50%; transform:translateY(-50%); color:#94a3b8; font-size:16px; pointer-events:none; } .input-with-icon input, .input-with-icon select{ padding-left:40px; } .register-form textarea{ min-height:64px; } .form-help{ display:flex; align-items:flex-start; gap:10px; margin-top:10px; padding:13px 14px; border-radius:18px; background:#f8fafc; border:1px solid var(--line); color:var(--muted); font-size:13px; line-height:1.45; } .form-help b{color:var(--text)} .register-actions{ display:flex; gap:10px; flex-wrap:wrap; margin-top:12px; } .register-actions button{ min-width:170px; } .preview-card{ background:linear-gradient(180deg,#ffffff,#f8fafc); border:1px solid rgba(255,255,255,.78); border-radius:28px; box-shadow:var(--shadow); overflow:hidden; } .preview-top{ padding:22px; background:linear-gradient(135deg,#0f172a,#1e3a8a); color:white; } .preview-top h3{ margin:0; font-size:22px; letter-spacing:-.03em; } .preview-top p{ margin:7px 0 0; color:#cbd5e1; line-height:1.5; } .student-card-preview{ margin:22px; padding:20px; border:1px solid var(--line); border-radius:22px; background:white; } .avatar-large{ width:74px; height:74px; border-radius:24px; display:grid; place-items:center; background:linear-gradient(135deg,#dbeafe,#e0e7ff); color:#1d4ed8; font-size:25px; font-weight:950; margin-bottom:14px; } .preview-name{ font-size:22px; font-weight:950; letter-spacing:-.035em; margin-bottom:4px; } .preview-sub{ color:var(--muted); font-size:14px; margin-bottom:14px; } .preview-row{ display:flex; justify-content:space-between; gap:12px; padding:10px 0; border-top:1px solid var(--line); color:var(--muted); font-size:13px; } .preview-row strong{ color:var(--text); text-align:right; } .sensor-guide{ margin:0 22px 22px; padding:18px; border-radius:22px; background:#ecfdf5; border:1px solid #bbf7d0; } .sensor-guide-title{ display:flex; align-items:center; gap:10px; font-weight:950; color:#166534; margin-bottom:8px; } .sensor-guide p{ margin:0; color:#166534; line-height:1.55; font-size:13px; } .scan-mini{ width:44px; height:44px; border-radius:14px; display:grid; place-items:center; background:#dcfce7; position:relative; overflow:hidden; flex:0 0 auto; } .scan-mini:before{ content:""; position:absolute; left:7px; right:7px; height:3px; border-radius:99px; background:#16a34a; animation:miniScan 1.25s linear infinite; } @keyframes miniScan{ 0%{top:9px} 50%{top:33px} 100%{top:9px} } .register-warning{ display:none; margin-top:12px; padding:12px 14px; border-radius:16px; background:#fff7ed; border:1px solid #fed7aa; color:#9a3412; font-size:13px; line-height:1.45; } .register-warning.show{display:block} @media(max-width:1050px){ .register-layout{grid-template-columns:1fr} } @media(max-width:1100px){.form-grid-register{grid-template-columns:repeat(2,minmax(0,1fr))}} @media(max-width:650px){ .register-head{align-items:flex-start;flex-direction:column} .register-steps{grid-template-columns:1fr} .form-grid-register{grid-template-columns:1fr} .register-actions button{width:100%} } .sensor-sync-card{ margin:14px 20px 0; padding:14px 16px; border-radius:18px; background:#eff6ff; border:1px solid #bfdbfe; color:#1e40af; display:flex; align-items:center; justify-content:space-between; gap:12px; flex-wrap:wrap; font-size:13px; } .sensor-sync-card strong{color:#1e3a8a} @media(max-width:950px){.app{grid-template-columns:1fr}.metric,.hero,.control{grid-column:span 12}.hero-inner{flex-direction:column;text-align:center}}@media(max-width:560px){.main{padding:18px}.topbar{flex-direction:column;align-items:stretch}.actions button,.actions .btn{width:100%}.detail-grid{grid-template-columns:1fr}} </style> </head> <body> <div class="app"> <aside class="sidebar"> <div class="brand"><div class="logo">⌁</div><div><h1>BioTrack Pro</h1><p>Fingerprint attendance system</p></div></div> <nav class="nav"> <button class="active" onclick="showPage('dashboard',this)">📊 Dashboard</button> <button onclick="showPage('register',this)">➕ Register</button> <button onclick="showPage('history',this)">🕒 Attendance History</button> <button onclick="showPage('records',this)">👥 Records</button> </nav> <div class="device"> <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 API update: <span id="apiTime">--</span> </div> </aside> <main class="main"> <header class="topbar"> <div><h2 id="pageTitle">Attendance Dashboard</h2><p id="pageSubtitle">Live fingerprint registration, entry, exit, and records.</p></div> <div class="actions"> <button id="soundToggleBtn" class="btn-soft" onclick="toggleSound()">🔇 Enable Sound</button> <button class="btn-green" onclick="exportAttendanceCsv()">Export Attendance CSV</button> </div> </header> <section id="page-dashboard" class="page active"> <div class="grid"> <div class="card pad hero"> <div class="hero-inner"> <div class="finger"><div class="icon">⌁</div></div> <div> <h3 id="heroTitle">Waiting for fingerprint scan</h3> <p id="heroMessage">When someone scans or when registration completes, this dashboard will show a popup, update this display, and play a sound.</p> <div class="pills"><span class="pill" id="lastEventPill">No event yet</span><span class="pill" id="lastPersonPill">No user</span><span class="pill" id="lastTimePill">--:--:--</span></div> </div> </div> </div> <div class="card table-card"> <div class="table-header"><div><h3>Live Attendance Feed</h3><p>Newest scans and registration events.</p></div><button class="btn-soft" onclick="refreshNow(true)">Refresh Now</button></div> <div class="table-wrap"><table><thead><tr><th>Time</th><th>Event</th><th>Finger ID</th><th>Name</th><th>College ID</th><th>Message</th></tr></thead><tbody id="liveBody"></tbody></table></div> <div class="status-strip" id="debugStrip">Waiting for dashboard data...</div> </div> </div> </section> <section id="page-register" class="page"> <div class="grid"> <div class="card pad metric"><small>Total Enrolled</small><strong id="totalEnrolled">--</strong><span>Fingerprints stored</span></div> <div class="card pad metric"><small>Entries</small><strong id="entryCount">0</strong><span>People entered</span></div> <div class="card pad metric"><small>Exits</small><strong id="exitCount">0</strong><span>People exited</span></div> <div class="card pad metric"><small>Next ID</small><strong id="nextId">--</strong><span>Next enrollment slot</span></div> <div class="register-layout"> <div class="register-hero-card"> <div class="register-head"> <div class="register-title-wrap"> <div class="register-icon">⌁</div> <div> <h2>Register Fingerprint</h2> <p>Add student/staff details, then enroll their finger on the R503 sensor.</p> </div> </div> <div class="enroll-status-pill"><span class="enroll-status-dot"></span><span id="registerStatusText">Ready</span></div> </div> <div class="register-steps"> <div class="reg-step active" id="regStepInfo"><span class="reg-step-num">1</span>Person Details</div> <div class="reg-step" id="regStepScan"><span class="reg-step-num">2</span>Finger Scan</div> <div class="reg-step" id="regStepSave"><span class="reg-step-num">3</span>Save Record</div> </div> <div class="register-form"> <div class="form-grid-register"> <div class="form-group"> <label>Name</label> <div class="input-with-icon"><span class="field-icon">👤</span><input id="enrollName" placeholder="Full name" oninput="updateRegisterPreview()"></div> </div> <div class="form-group"> <label>College ID</label> <div class="input-with-icon"><span class="field-icon">🪪</span><input id="enrollCollegeId" placeholder="Student / staff ID" oninput="updateRegisterPreview()"></div> </div> <div class="form-group"> <label>Role</label> <div class="input-with-icon"> <span class="field-icon">🎓</span> <select id="enrollRole" onchange="updateRegisterPreview()"> <option>Student</option> <option>Staff</option> <option>Faculty</option> <option>Visitor</option> </select> </div> </div> <div class="form-group"> <label>Department</label> <div class="input-with-icon"><span class="field-icon">🏫</span><input id="enrollDept" placeholder="Department / Program" oninput="updateRegisterPreview()"></div> </div> <div class="form-group full"> <label>Notes</label> <textarea id="enrollNote" placeholder="Optional notes, class, lab group, or remarks" oninput="updateRegisterPreview()"></textarea> </div> </div> <div id="registerWarning" class="register-warning">Please enter at least a name or college ID before starting registration.</div> <div class="register-actions"> <button class="btn-green" onclick="startEnroll('full')">Start Registration</button> <button class="btn-soft" onclick="clearRegisterForm()">Clear Form</button> <button class="btn-red" onclick="cancelEnroll()">Cancel Enrollment</button> </div> </div> </div> </div> </div> </section> <section id="page-history" class="page"> <div class="card table-card"> <div class="table-header"> <div> <h3>Attendance History</h3> <p>Student/staff in and out records generated from fingerprint scans.</p> </div> </div> <div class="table-wrap"> <table> <thead> <tr> <th>Name</th> <th>College ID</th> <th>Role</th> <th>Department</th> <th>Finger ID</th> <th>Login Time</th> <th>Logout Time</th> <th>Status</th> </tr> </thead> <tbody id="historyBody"></tbody> </table> </div> </div> </section> <section id="page-records" class="page"> <div class="card table-card"> <div class="table-header"> <div> <h3>Student / Staff Records</h3> <p>Registered people and their assigned fingerprint IDs.</p> </div> <button class="btn-soft" onclick="refreshNow(true)">Refresh</button> </div> <div class="sensor-sync-card"> <div><strong>Sensor Sync:</strong> Records are loaded from the R503 sensor memory through ESP32. IDs without saved names are shown as unassigned fingerprints.</div> <div>Registered IDs found: <strong id="registeredCount">--</strong></div> </div> <div class="table-wrap"> <table> <thead> <tr> <th>Finger ID</th> <th>Name</th> <th>College ID</th> <th>Role</th> <th>Department</th> <th>Action</th> </tr> </thead> <tbody id="recordsBody"></tbody> </table> </div> </div> </section> </main> </div> <div id="banner" class="banner"><div id="bannerIcon" class="banner-icon">i</div><div><strong id="bannerTitle">Message</strong><span id="bannerText">Details</span></div></div> <div id="liveModal" class="live-modal"><div id="liveCard" class="live-card"><div id="modalIcon" class="big-icon">✓</div><h2 id="modalTitle">Success</h2><p id="modalMessage">Action completed successfully.</p><div class="detail-grid"><div class="detail"><span>Name</span><strong id="modalName">-</strong></div><div class="detail"><span>Finger ID</span><strong id="modalId">-</strong></div><div class="detail"><span>College ID</span><strong id="modalCollege">-</strong></div><div class="detail"><span>Department</span><strong id="modalDept">-</strong></div></div><div style="margin-top:22px"><button class="btn-primary" onclick="closeModal()">Done</button></div></div></div> <script> let state={},logs=[],registeredFingerprints=[],lastSeenKey="",firstLoad=true,soundEnabled=false; function showPage(name,btn){ document.querySelectorAll(".page").forEach(p=>p.classList.remove("active")); document.getElementById("page-"+name).classList.add("active"); document.querySelectorAll(".nav button").forEach(b=>b.classList.remove("active")); if(btn)btn.classList.add("active"); if(name==="dashboard"){ pageTitle.textContent="Attendance Dashboard"; pageSubtitle.textContent="Live fingerprint registration, entry, exit, and records."; }else if(name==="register"){ pageTitle.textContent="Register Fingerprint"; pageSubtitle.textContent="Register a person and enroll their fingerprint."; }else if(name==="history"){ pageTitle.textContent="Attendance History"; pageSubtitle.textContent="View student/staff in and out attendance records."; }else{ pageTitle.textContent="Student / Staff Records"; pageSubtitle.textContent="Registered people and their assigned fingerprint IDs."; } } 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"); showBanner("info", "Sound Enabled", "Dashboard sounds are now active."); }else{ if(btn) btn.textContent = "🔇 Enable Sound"; showBanner("info", "Sound Disabled", "Dashboard sounds are now off."); } } 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||"";bannerIcon.textContent=type==="success"?"✓":type==="error"?"!":"i";banner.className="banner show "+(type==="success"?"success":type==="error"?"error":"");setTimeout(()=>banner.className="banner",4500)} function showModal(type,title,message,data={}){liveCard.className="live-card "+(type==="error"?"error":type==="info"?"info":"");modalIcon.textContent=type==="error"?"!":type==="info"?"i":"✓";modalTitle.textContent=title;modalMessage.textContent=message||"";modalName.textContent=data.name||"-";modalId.textContent=data.id>=0?data.id:"-";modalCollege.textContent=data.collegeId||"-";modalDept.textContent=data.department||"-";createConfetti(type);liveModal.classList.add("show");setTimeout(()=>closeModal(),6000)} function closeModal(){liveModal.classList.remove("show")} function createConfetti(type){liveCard.querySelectorAll(".confetti").forEach(e=>e.remove());if(type==="error")return;const colors=["#2563eb","#16a34a","#f59e0b","#7c3aed","#ef4444","#06b6d4"];for(let i=0;i<24;i++){const c=document.createElement("div");c.className="confetti";c.style.left=(15+Math.random()*80)+"%";c.style.top=(-10-Math.random()*40)+"px";c.style.background=colors[i%colors.length];c.style.animationDelay=(Math.random()*0.35)+"s";liveCard.appendChild(c)}} function eventType(event){event=(event||"").toUpperCase();if(event.includes("ENTRY")||event.includes("MATCH"))return"entry";if(event.includes("EXIT"))return"exit";if(event.includes("ENROLLED")||event.includes("SAVED"))return"enrolled";if(event.includes("ERROR")||event.includes("NOT")||event.includes("DUPLICATE"))return"error";return"info"} function eventBadge(event){const t=eventType(event);if(t==="entry")return"b-entry";if(t==="exit")return"b-exit";if(t==="enrolled")return"b-enrolled";if(t==="error")return"b-error";return"b-info"} function eventKey(l){if(!l)return"";return[l.time,l.event,l.id,l.message].join("|")} function personName(l){return l.name||(l.id>=0?("ID "+l.id):"System")} function handleNewEvent(l){if(!l)return;const type=eventType(l.event);const name=personName(l);const msg=l.message||"";lastEventPill.textContent=l.event||"INFO";lastPersonPill.textContent=name;lastTimePill.textContent=l.time||"--:--:--";if(type==="enrolled"){setRegisterStep(3);if(typeof registerStatusText!=="undefined")registerStatusText.textContent="Saved successfully";heroTitle.textContent="Registration Successful";heroMessage.textContent=name+" has been enrolled successfully.";showBanner("success","Registration Successful",name+" has been enrolled successfully.");showModal("success","Registration Successful",name+" has been enrolled successfully.",l);beep("success")}else if(type==="entry"){heroTitle.textContent="Welcome, "+name;heroMessage.textContent=msg||"Attendance entry logged successfully.";showBanner("success","Welcome, "+name,msg||"Attendance entry logged.");showModal("success","Welcome, "+name,msg||"Attendance entry logged successfully.",l);beep("success")}else if(type==="exit"){heroTitle.textContent="Goodbye, "+name;heroMessage.textContent=msg||"Exit logged successfully.";showBanner("info","Exit Logged",name+" exited.");showModal("info","Exit Logged",name+" exited.",l);beep("info")}else if(type==="error"){if(typeof registerStatusText!=="undefined")registerStatusText.textContent="Needs attention";heroTitle.textContent="Attention Required";heroMessage.textContent=msg||l.event||"Something went wrong.";showBanner("error",l.event||"Error",msg||"Please try again.");showModal("error",l.event||"Error",msg||"Please try again.",l);beep("error")}else if((l.event||"").toUpperCase().includes("ENROLL")){setRegisterStep(2);if(typeof registerStatusText!=="undefined")registerStatusText.textContent="Scanning finger";heroTitle.textContent="Enrollment In Progress";heroMessage.textContent="Place finger on the sensor and follow the OLED instructions.";showBanner("info","Enrollment Started","Place finger on the R503 sensor.");beep("info")}else{heroTitle.textContent=l.event||"System Update";heroMessage.textContent=msg||"Dashboard received a new event.";showBanner("info",l.event||"System Update",msg||"New dashboard event.")}} function escapeHtml(v){ return String(v ?? "").replace(/[&<>"']/g, ch => ({ "&":"&", "<":"<", ">":">", "\"":""", "'":"'" }[ch])); } function buildPeopleRecords(){ const people = {}; // IMPORTANT: // Records page must be based ONLY on fingerprints currently stored in the R503 sensor. // Old logs are used only to enrich name/college/role/department for those existing IDs. // This prevents a deleted fingerprint from reappearing just because old logs still exist. 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 || "", lastSeen:"", status:fp.name || fp.collegeId ? "Registered" : "Unassigned" }; }); logs.forEach(l => { const id = Number(l.id); if(id < 0) return; // Do not recreate deleted fingerprints from old logs. if(!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") || ev.includes("SAVED")){ people[id].status = "Registered"; people[id].lastSeen = l.time || people[id].lastSeen; } if(ev.includes("ENTRY") || ev.includes("MATCH")){ people[id].status = "Inside"; people[id].lastSeen = l.time || people[id].lastSeen; } if(ev.includes("EXIT")){ people[id].status = "Exited"; people[id].lastSeen = l.time || people[id].lastSeen; } }); return Object.values(people).sort((a,b)=>a.id-b.id); } function buildAttendanceHistory(){ const openEntries = {}; const rows = []; logs.forEach(l => { const id = Number(l.id); if(id < 0) return; const ev = (l.event || "").toUpperCase(); const base = { id:id, name:l.name || ("ID " + id), collegeId:l.collegeId || "-", role:l.role || "-", department:l.department || "-", inTime:"", outTime:"", status:"" }; // Every new ENTRY/MATCH is treated as a new attendance line. // If there was already an open entry without an exit, keep that old line // instead of overwriting it. if(ev.includes("ENTRY") || ev.includes("MATCH")){ if(openEntries[id]){ rows.push(openEntries[id]); } openEntries[id] = {...base, inTime:l.time || "", outTime:"", status:"Inside"}; }else if(ev.includes("EXIT")){ if(openEntries[id]){ openEntries[id].outTime = l.time || ""; openEntries[id].status = "Completed"; rows.push(openEntries[id]); delete openEntries[id]; }else{ rows.push({...base, inTime:"-", outTime:l.time || "", status:"Exit only"}); } } }); Object.keys(openEntries).forEach(id => rows.push(openEntries[id])); // Newest attendance line first. return rows.reverse(); } function renderTables(){ const liveRows = logs.slice().reverse().map(l => ` <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>${escapeHtml(l.collegeId || "-")}</td> <td>${escapeHtml(l.message || "")}</td> </tr> `).join(""); liveBody.innerHTML = liveRows || `<tr><td colspan="6">No logs received yet.</td></tr>`; const historyRows = buildAttendanceHistory().map(r => ` <tr> <td>${escapeHtml(r.name)}</td> <td>${escapeHtml(r.collegeId)}</td> <td>${escapeHtml(r.role)}</td> <td>${escapeHtml(r.department)}</td> <td>${r.id}</td> <td>${escapeHtml(r.inTime || "-")}</td> <td>${escapeHtml(r.outTime || "-")}</td> <td><span class="badge ${r.status==="Inside" ? "b-entry" : r.status==="Completed" ? "b-exit" : "b-info"}">${escapeHtml(r.status)}</span></td> </tr> `).join(""); if(typeof historyBody !== "undefined"){ historyBody.innerHTML = historyRows || `<tr><td colspan="8">No login/logout attendance history 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.role || "-")}</td> <td>${escapeHtml(p.department || "-")}</td> <td><button class="btn-mini-red" onclick="deleteFingerprint(${p.id})">Delete</button></td> </tr> `).join(""); recordsBody.innerHTML = peopleRows || `<tr><td colspan="6">No registered fingerprints found in the sensor yet.</td></tr>`; if(typeof registeredCount !== "undefined") registeredCount.textContent = registeredFingerprints.length; } function csvEscape(value){ value = String(value ?? ""); value = value.replace(/"/g, '""'); return '"' + value + '"'; } function exportAttendanceCsv(){ const rows = buildAttendanceHistory(); if(!rows.length){ showBanner("error", "No Attendance Data", "There is no login/logout attendance history to export yet."); return; } let csv = "name,college_id,role,department,fingerprint_id,login_time,logout_time,status\n"; rows.slice().reverse().forEach(r => { csv += [ csvEscape(r.name), csvEscape(r.collegeId), csvEscape(r.role), csvEscape(r.department), csvEscape(r.id), csvEscape(r.inTime || "-"), csvEscape(r.outTime || "-"), csvEscape(r.status) ].join(",") + "\n"; }); 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 = "attendance_history.csv"; document.body.appendChild(a); a.click(); document.body.removeChild(a); URL.revokeObjectURL(url); showBanner("success", "Export Complete", "Attendance login/logout history was exported."); } function updateStatusUi(){const wifi=!!state.wifi;wifiText.textContent=wifi?"Connected":"Offline";wifiDot.className="dot "+(wifi?"ok":"");ipText.textContent=state.ip||"--";apiTime.textContent=new Date().toLocaleTimeString();totalEnrolled.textContent=state.templates??"--";nextId.textContent=state.nextId??"--";entryCount.textContent=state.entryCount??logs.filter(l=>eventType(l.event)==="entry").length;exitCount.textContent=state.exitCount??logs.filter(l=>eventType(l.event)==="exit").length;debugStrip.innerHTML="API connected. Logs: <b>"+logs.length+"</b> | Last event: <b>"+((state.last&&state.last.event)?state.last.event:"None")+"</b> | Enrolling: <b>"+(state.isEnrolling?"YES":"NO")+"</b>"; updateRegisterPreview(); if(state.isEnrolling){ setRegisterStep(2); if(typeof registerStatusText!=="undefined")registerStatusText.textContent="Scanning finger"; } } function getInitials(name){ const parts = String(name || "New User").trim().split(/\s+/).filter(Boolean); return parts.slice(0,2).map(p => p[0].toUpperCase()).join("") || "NU"; } 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"); el.classList.remove("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 updateRegisterPreview(){ // Live Profile Preview was removed. This function is kept so refresh/status code remains safe. } function clearRegisterForm(){ enrollName.value = ""; enrollCollegeId.value = ""; enrollRole.value = "Student"; enrollDept.value = ""; enrollNote.value = ""; const warn = document.getElementById("registerWarning"); if(warn) warn.classList.remove("show"); setRegisterStep(1); if(typeof registerStatusText !== "undefined") registerStatusText.textContent = "Ready"; updateRegisterPreview(); } function validateRegisterForm(){ const hasName = (enrollName?.value || "").trim().length > 0; const hasId = (enrollCollegeId?.value || "").trim().length > 0; const warn = document.getElementById("registerWarning"); if(!hasName && !hasId){ if(warn) warn.classList.add("show"); showBanner("error", "Missing Details", "Enter at least a name or college ID before registration."); 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){lastEventPill.textContent=latest.event||"INFO";lastPersonPill.textContent=personName(latest);lastTimePill.textContent=latest.time||"--:--:--";if(forcePopup)handleNewEvent(latest)}return}if((forcePopup&&latest)||(key&&key!==lastSeenKey)){lastSeenKey=key;handleNewEvent(latest)}if(state.isEnrolling){heroTitle.textContent="Enrollment In Progress";heroMessage.textContent="Place finger on the sensor and follow the OLED instructions.";debugStrip.innerHTML="Enrollment running. Waiting for fingerprint sensor..."}}catch(e){debugStrip.innerHTML="Dashboard API error: <b>"+e.message+"</b>";showBanner("error","Dashboard API Error",e.message)}} async function startEnroll(mode){if(!validateRegisterForm())return;let name=enrollName.value||"",collegeId=enrollCollegeId.value||"",role=enrollRole.value||"",department=enrollDept.value||"",note=enrollNote.value||"";const form=new URLSearchParams();form.append("name",name);form.append("collegeId",collegeId);form.append("role",role);form.append("department",department);form.append("note",note);try{setRegisterStep(2);if(typeof registerStatusText!=="undefined")registerStatusText.textContent="Scanning finger";heroTitle.textContent="Enrollment In Progress";heroMessage.textContent="Place finger on the R503 sensor now.";showBanner("info","Enrollment Started","Place finger on the sensor.");showModal("info","Enrollment Started","Place finger on the R503 sensor now.",{name:name||"New User",id:-1,collegeId:collegeId,department:department});beep("info");await api("/api/enroll",{method:"POST",headers:{"Content-Type":"application/x-www-form-urlencoded"},body:form});setTimeout(()=>refreshNow(),500)}catch(e){setRegisterStep(1);if(typeof registerStatusText!=="undefined")registerStatusText.textContent="Failed";showBanner("error","Enrollment Failed",e.message);showModal("error","Enrollment Failed",e.message,{name:name,id:-1,collegeId:collegeId,department:department});beep("error")}} async function cancelEnroll(){try{await api("/api/cancel",{method:"POST"});showBanner("info","Enrollment Cancelled","System returned to scan mode.");beep("info");refreshNow()}catch(e){showBanner("error","Cancel Failed",e.message)}} async function deleteFingerprint(id){ if(!id){ showBanner("error","Missing ID","No fingerprint ID was selected."); return; } if(!confirm("Delete fingerprint ID "+id+" and remove this student/staff record?")){ return; } try{ await api("/api/fingerprint?id="+encodeURIComponent(id),{method:"DELETE"}); showBanner("success","Record Deleted","Fingerprint ID "+id+" and assigned details were removed."); beep("success"); refreshNow(); }catch(e){ showBanner("error","Delete Failed",e.message); beep("error"); } } updateRegisterPreview();setRegisterStep(1);refreshNow();setInterval(refreshNow,1000); </script> </body> </html> )rawliteral"; #endif |
Testing & Demo of ESP32 Fingerprint Attendance System
After completing the hardware connection and uploading the code, the ESP32 fingerprint attendance system 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 attendance 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 fingerprint.
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 BioTrack Pro attendance dashboard.
The dashboard page shows the live fingerprint system status, Wi-Fi connection, latest API update time, and live attendance feed. From the left-side menu, we can open different sections such as Dashboard, Register, Attendance History, and Records.
The Register page is used to add student or staff details and start fingerprint enrollment.
The Attendance History page shows login and logout records, while the Records page displays registered users and their assigned fingerprint IDs.
The dashboard also includes options to enable sound alerts and export attendance data as a CSV file.
Registering the Fingerprints
To register a new fingerprint, open the ESP32 web dashboard and go to the Register section. Here, enter the user details such as name, college ID, role, and department, then click the Start Registration button. In this example, the user name is entered as Joe Root with college ID CS-456 and department Computer.
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 user name, fingerprint ID, college ID, and department.
If the same registered finger is scanned again during the registration process, the system detects it as a duplicate fingerprint.
After this, the registered fingerprint can be used for marking attendance.
Recording the Attendance
After the fingerprint is registered, the system can be used to record attendance.
When a user places their finger on the R503 fingerprint sensor, the OLED display shows that the system is searching and checking the fingerprint.
If the fingerprint matches with a saved record, the ESP32 marks the user’s attendance and shows the entry or exit status.
For the first scan, the dashboard displays a welcome popup with the user’s name, fingerprint ID, college ID, and department. This means the user has entered, and the entry time is saved in the attendance log.
When the same user scans again, the system records it as an exit and displays a goodbye or exit logged message on the 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 database. The dashboard also keeps updating the live attendance feed, attendance history, and student/staff records.
In the Attendance History section, each entry and exit record is shown with name, college ID, role, department, finger ID, login time, logout time, and status.
The Records section shows all registered users along with their assigned fingerprint IDs and delete option.
Apart from registration and attendance recording, the dashboard also includes some useful management features. In the Student / Staff Records section, all registered users are listed with their fingerprint ID, name, college ID, role, and department. If any fingerprint needs to be removed, the user can click the Delete button, and the ESP32 deletes that fingerprint ID from the R503 sensor memory as well as removes the saved user details from the system.
The dashboard also provides an Export Attendance CSV option. This allows the attendance history to be downloaded as a CSV file, which can be opened in Excel or Google Sheets for record keeping.
