Overview
In this project, we will build an MQTT Based Wind Weather Station using GSM & Arduino. The wind weather station is a device mainly used to measure the wind speed in wild. Outdoor activities like Surfing, paragliding, kites, hot air balloons, and other activities have attracted more and more attention. Those activities are more or less affected by wind speed. This is why it is necessary to make a Wind Weather Station. The Weather Station not only measures the Wind Speed but also measures the surrounding temperature, humidity, atmospheric pressure, UV Ray Index, PM2.5 values, etc. The wind weather station can be placed in the wild to measure wind speed.
So, in this project, we will see the functionalities of the GSM Wind Weather Station box and check its components. We will upload the basic code to read the weather station data on OLED Display. We will also make an MQTT Based Wind Weather Station and monitor the data on MQTT Dashboard. Mosquitto is a free open source MQTT broker which can be used for this application.
Before moving ahead, you can go through some previous Weather Station projects:
1. IoT Live Weather Station
2. BME280 Arduino Weather Station
3. BME280 ESP32 Mini Weather Station
4. BME280 ESP8266 Mini Weather Station
5. LoRa Based Wireless Weather Station
6. BME680 MQTT Weather Station
Wind Weather Station Hardware
To purchase this Weather Station Kit, you can check Makerfabs Link. The combined board will cost you around 45.80 dollars. In case you need an additional PM2.5 Sensor, the price will be 50.70 dollars.
The Wind Weather Station measures the outdoor humidity, temperature, atmospheric pressure, wind speed and transmits the results remotely to the server for real-time checking. These are the external Ports for connecting Anemometer and PM2.5 Sensor. You can connect the solar panel for charging the Lithium-Ion Battery.
On the other side, there are pins for connecting I2C or analog sensors. There is a slide switch to turn ON/OFF the device. The outer pin mapping details can be checked below.
1. Interface of Anemometer
2. Interface of PM2.5 Sensor
3. Other GPIOs Interfaces
Anemometer
The box also includes a Cup-Type Anemometer sensor basically with NPN output. This detects even a slight moment of air and measures the wind velocity. This Anemometer is an imporatant part of GSM Based Wind Weather Station.
Unlike the Analog Output Anemometer, this anemometer output pulse reflects the wind speed more accurately. Besides, this anemometer is totally Waterproof, with a stable installation design, suitable for outdoor applications. It also has a 4 pin military-type probe that connects with a connector or expansion cable. On the next end of the cable, there is a 3 pin connector that fits perfectly on the weather station box.
You can place the box along with the Anemometer at the top of the house or outdoor where you want to measure the weather parameters.
Internal Circuit & PCB
To check the PCB Board and construction of this system, you need to open the box. After removing the screw you can open the 3D Casing. The inside has a PCB Board, few Antennas, and a Battery. The battery is a Lithium-Ion Battery of 3.7V and 1800 mAh capacity. The GPS and GSM antennas are connected to the board with UFL Connector. There is a 2pin removable battery connector as well.
The PCB has an A9G GSM+GPRS+GPS Module. The A9G GPS Tracker is an IoT (Internet of things) Solution-based product that integrates a micro Controller ATSAMD21G18, GRRS/GSM+GPS module A9G with the best power management and storage. The board is low-powered and manufactured by AI-Thinker.
The PCB has a Microcontroller called ATSAMD21G18 which is a 32-Bit ARM Cortex M0+ microcontroller from Microchip. There is a Micro-USB Port for programming and Serial Application. The board integrates DHT11 Humidity and Temperature Sensor, BMP280 Barometric Pressure Sensor, and some ports for connecting external sensors like PM2.5 & Anemometer. The LED & Buzzer is for indication. You can disable them for lower power consumption. A reset button can be used for debugging and testing. You can connect a 6V Solar panel to charge the Lithium-Ion Battery. Hence this is a Solar powered Wind Weather Station using GSM & Arduino.
The backside of the PCB has a 0.91″ OLED Display. It also has an SD Card Slot so that you can insert the SD Card and use it as a data logger. The long reset button on the board is used for enabling or disabling the OLED Display. There is a SIM Card Tray which only supports 2G SIM for GPRS Applications. You can insert a Mini-SIM inside the SIM Tray. Be careful while inserting the SIM and check the direction of the SIM.
Setting Up Arduino IDE for Programming
The ATSAMD21G18 doesn’t have pre-installed Board in the Arduino IDE. So, we need to install “Arduino Zero Board” from the Board Manager.
Open the Boards Manager From the top Arduino IDE menu, select Tools-> Board-> Boards Manager… to open the Boards Manager dialog box. Then install Arduino SAMD Boards(32-bits ARM Cortex-M0+).
Once, installation is completed, you can now select the Arduino Zero board as shown in the image below. To program this Board you need to connect MicroUSB Data Cable.
Basic Code for Reading Wind Weather Station Data
Let us move to the Test Code or the default example code first. Open your Arduino IDE and paste the following code. This is a test code to check whether the device works or not.
This code requires some of the libraries like BMP280 Library, Adafruit SSD1306, Adafruit GFX, and also the DHT11 Library. First, download the following libraries and add them to the Library Folder.
1. BMP280 Library: https://github.com/adafruit/Adafruit_BMP280_Library
2. SSD1306 Library: https://github.com/adafruit/Adafruit_SSD1306
3. GFX Library: https://github.com/adafruit/Adafruit-GFX-Library
4. DHT11 Library: https://github.com/adafruit/DHT-sensor-library
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#include <Wire.h> #include <Adafruit_BMP280.h> #include <Adafruit_GFX.h> #include <Adafruit_SSD1306.h> #include <DHT.h> #include <SD.h> // variables will change: int buttonState = 0; // variable for reading the pushbutton status bool tag = 0; bool ledStateTag = 0; #define DHTPIN 13 // the number of the DHT11 pin //#define DHTPIN A0 #define DHTTYPE DHT11 DHT dht(DHTPIN, DHTTYPE); #define VCC_PIN 2 //3.3V #define VDD_PIN 7 //5V #define BUZZER_PIN 12 #define SD_CS 4 #define pinInterrupt A0 // the number of the Wind Speed sensor pin #define PM_READ_PIN A1 #define PM_LED_PIN 10 #define ledPin 11 // the number of the LED pin #define buttonPin 3 // the number of the pushbutton pin #define UV_PIN A4 #define SCREEN_WIDTH 128 // OLED display width, in pixels #define SCREEN_HEIGHT 32 // OLED display height, in pixels #define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin) Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); #define BMP280_I2C_ADDRESS 0x76 #define BMP280_DEVICE_ID 0x58 Adafruit_BMP280 bmp; // I2C int humidity_value = 0; int temperature_value = 0; int speed_value = 0; int pressure_value = 0; int show_index = 0; int Count = 0; int runtime = 0; int sensortime = 0; int dhttime = 0; unsigned long lastDebounceTime = 0; // the last time the output pin was toggled unsigned long debounceDelay = 1000; // the debounce time; increase if the output flickers void setup() { SerialUSB.begin(115200); SerialUSB.println("---------------Start----------------------"); pin_init(); SerialUSB.println("Pin init over"); //sd_test(); //i2c_scan(); i2c_dev_init(); logo_show(); dht.begin(); } void loop() { // read the state of the pushbutton value: buttonState = digitalRead(buttonPin); // check if the pushbutton is pressed. If it is, the buttonState is HIGH: if (buttonState == HIGH) { } else { delay(50); if (digitalRead(buttonPin) == 0) { tag = !tag; if (tag) { Wire.endTransmission(); // digitalWrite(ledPin, HIGH); // turn LED off: delay(100); digitalWrite(VCC_PIN, LOW); delay(100); digitalWrite(VDD_PIN, LOW); delay(100); SerialUSB.println("Power 3V3 off"); } else { // turn LED on: digitalWrite(ledPin, LOW); delay(100); digitalWrite(VCC_PIN, HIGH); delay(100); digitalWrite(VDD_PIN, HIGH); delay(100); SerialUSB.println("Power 3V3 on"); i2c_dev_init(); //re-init dht.begin(); } } } if (!tag) { wind_speed(); if ((millis() - sensortime) > 1000) { SerialUSB.println("Read bmp"); bmp_read(); //i2c_scan(); sensortime = millis(); } //DHT is slow if ((millis() - dhttime) > 4000) { SerialUSB.println("Read dht"); dht_read(); dhttime = millis(); } if ((millis() - runtime) > 2000) { sensor_show(); runtime = millis(); } } //ledStateTag=!ledStateTag; } void pin_init() { pinMode(VDD_PIN, OUTPUT); pinMode(VCC_PIN, OUTPUT); pinMode(BUZZER_PIN, OUTPUT); pinMode(PM_LED_PIN, OUTPUT); pinMode(pinInterrupt, INPUT_PULLUP); //set as input pin attachInterrupt(digitalPinToInterrupt(pinInterrupt), onChange, FALLING); digitalWrite(VDD_PIN, LOW); delay(500); digitalWrite(VDD_PIN, HIGH); digitalWrite(VCC_PIN, LOW); delay(500); digitalWrite(VCC_PIN, HIGH); digitalWrite(BUZZER_PIN, HIGH); delay(500); digitalWrite(BUZZER_PIN, LOW); delay(1000); } void i2c_scan() { Wire.begin(); byte error, address; int nDevices; static int s = 0; SerialUSB.print(s++); SerialUSB.println(". Scanning..."); nDevices = 0; for (address = 1; address < 127; address++) { // The i2c_scanner uses the return value of // the Write.endTransmisstion to see if // a device did acknowledge to the address. Wire.beginTransmission(address); error = Wire.endTransmission(); if (error == 0) { SerialUSB.print("I2C device found at address 0x"); if (address < 16) SerialUSB.print("0"); SerialUSB.print(address, HEX); SerialUSB.println(" !"); nDevices++; } else if (error == 4) { SerialUSB.print("Unknown error at address 0x"); if (address < 16) SerialUSB.print("0"); SerialUSB.println(address, HEX); } } if (nDevices == 0) SerialUSB.println("No I2C devices found\n"); else { SerialUSB.print(">>>> Found total "); ; SerialUSB.print(nDevices); SerialUSB.println(" devices\n"); } } void dht_read() { // Reading temperature or humidity takes about 250 milliseconds! // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor) float h = dht.readHumidity(); // Read temperature as Celsius (the default) float t = dht.readTemperature(); // Read temperature as Fahrenheit (isFahrenheit = true) float f = dht.readTemperature(true); // Check if any reads failed and exit early (to try again). if (isnan(h) || isnan(t) || isnan(f)) { SerialUSB.println(F("Failed to read from DHT sensor!")); return; } // Compute heat index in Fahrenheit (the default) float hif = dht.computeHeatIndex(f, h); // Compute heat index in Celsius (isFahreheit = false) float hic = dht.computeHeatIndex(t, h, false); SerialUSB.print(F("Humidity: ")); SerialUSB.print(h); SerialUSB.print(F("% Temperature: ")); SerialUSB.print(t); SerialUSB.print(F("°C ")); SerialUSB.print(f); SerialUSB.print(F("°F Heat index: ")); SerialUSB.print(hic); SerialUSB.print(F("°C ")); SerialUSB.print(hif); SerialUSB.println(F("°F")); humidity_value = (int)h; temperature_value = (int)t; } void bmp_read() { SerialUSB.print(F("Temperature = ")); SerialUSB.print(bmp.readTemperature()); SerialUSB.println(" *C"); SerialUSB.print(F("Pressure = ")); SerialUSB.print(pressure_value = bmp.readPressure()); SerialUSB.println(" Pa"); SerialUSB.print(F("Approx altitude = ")); SerialUSB.print(bmp.readAltitude(1013.25)); /* Adjusted to local forecast! */ SerialUSB.println(" m"); SerialUSB.println(); } void i2c_dev_init() { // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x32 Serial.println(F("SSD1306 allocation failed")); for (;;) ; // Don't proceed, loop forever } SerialUSB.println("SSD1306 found"); if (!bmp.begin(BMP280_I2C_ADDRESS, BMP280_DEVICE_ID)) { SerialUSB.println(F("Could not find a valid BMP280 sensor, check wiring!")); while (1) ; } SerialUSB.println("BMP280 found"); /* Default settings from datasheet. */ bmp.setSampling(Adafruit_BMP280::MODE_NORMAL, /* Operating Mode. */ Adafruit_BMP280::SAMPLING_X2, /* Temp. oversampling */ Adafruit_BMP280::SAMPLING_X16, /* Pressure oversampling */ Adafruit_BMP280::FILTER_X16, /* Filtering. */ Adafruit_BMP280::STANDBY_MS_500); /* Standby time. */ SerialUSB.println("BMP280 init over"); //i2c_scan(); } void logo_show() { display.clearDisplay(); display.setTextColor(SSD1306_WHITE); display.setTextSize(2); // Draw 2X-scale text display.setCursor(10, 0); display.println(F("Makerfabs")); display.setTextSize(1); display.setCursor(10, 16); display.println(F("Weather Station")); display.display(); // Show initial text delay(100); // Scroll in various directions, pausing in-between: display.startscrollright(0x00, 0x01); delay(4000); display.startscrolldiagright(0x00, 0x07); delay(2000); display.startscrolldiagleft(0x00, 0x07); delay(2000); display.stopscroll(); } void sensor_show() { display.clearDisplay(); display.setTextColor(SSD1306_WHITE); display.setTextSize(2); switch (show_index) { case 0: display.setCursor(0, 0); display.print("Temp:"); display.print(temperature_value); display.println(" C"); display.setCursor(0, 16); display.print("Humi:"); display.print(humidity_value); display.println(" %"); break; case 1: display.setCursor(0, 0); display.print("Humi:"); display.print(humidity_value); display.println(" %"); display.setCursor(0, 16); display.print("Wind:"); display.print(speed_value); display.println(" m/s"); break; case 2: display.setCursor(0, 0); display.print("PM2.5:"); display.setCursor(0, 16); display.print(pm25()); display.println(" mg/m3"); break; case 3: display.setCursor(0, 0); display.println("Pressure:"); display.setCursor(0, 16); display.print(pressure_value); display.println(" Pa"); break; case 4: display.setCursor(0, 0); display.print("UV:"); display.println(UV()); display.setCursor(0, 16); display.println("mW/m^2"); break; } display.display(); // Show initial text show_index++; show_index %= 5; } void sd_test() { File myFile; //SD(SPI) pinMode(SD_CS, OUTPUT); digitalWrite(SD_CS, HIGH); if (!SD.begin(SD_CS)) { SerialUSB.println("Card Mount Failed"); while (1) ; } else { SerialUSB.println("SD OK"); } if (SD.exists("example.txt")) { SerialUSB.println("example.txt exists."); } else { SerialUSB.println("example.txt doesn't exist."); } // open a new file and immediately close it: SerialUSB.println("Creating example.txt..."); myFile = SD.open("example.txt", FILE_WRITE); myFile.close(); // Check to see if the file exists: if (SD.exists("example.txt")) { SerialUSB.println("example.txt exists."); } else { SerialUSB.println("example.txt doesn't exist."); } // delete the file: SerialUSB.println("Removing example.txt..."); SD.remove("example.txt"); if (SD.exists("example.txt")) { SerialUSB.println("example.txt exists."); } else { SerialUSB.println("example.txt doesn't exist."); } } void onChange() { if (digitalRead(pinInterrupt) == LOW) Count++; // Serial.println("Key Down"); // else // Serial.println("Key UP"); } void wind_speed() { if ((millis() - lastDebounceTime) > debounceDelay) { lastDebounceTime = millis(); speed_value = Count * 8.75 * 0.01; SerialUSB.print(speed_value); Count = 0; SerialUSB.println("m/s"); } } int pm25() { int samplingTime = 280; int deltaTime = 40; int sleepTime = 9680; float voMeasured = 0; float calcVoltage = 0; float dustDensity = 0; digitalWrite(PM_LED_PIN, HIGH); // power on the LED delayMicroseconds(samplingTime); voMeasured = analogRead(PM_READ_PIN); // read the dust value voMeasured = voMeasured * 2.0 / 3.0; //5V to 3.3V delayMicroseconds(deltaTime); digitalWrite(PM_LED_PIN, LOW); // turn the LED off delayMicroseconds(sleepTime); // 0 - 5V mapped to 0 - 1023 integer values // recover voltage calcVoltage = voMeasured * (5.0 / 1024.0); // linear eqaution taken from http://www.howmuchsnow.com/arduino/airquality/ // Chris Nafis (c) 2012 dustDensity = 170 * calcVoltage - 0.1; SerialUSB.println("PM2.5:"); SerialUSB.println(dustDensity); // unit: ug/m3 return (int)dustDensity; } double UV() { int sensorValue; long sum = 0; for (int i = 0; i < 256; i++) // accumulate readings for 1024 times { sensorValue = analogRead(UV_PIN); sum = sensorValue + sum; delay(2); } long meanVal = sum / 256; // get mean value double UV_value = (meanVal * 1000 / 4.3 - 83) / 21; SerialUSB.print("The A4 is:"); SerialUSB.println(meanVal); // get a detailed calculating expression for UV index in schematic files. SerialUSB.print("The current UV index is:"); SerialUSB.print(UV_value); // get a detailed calculating expression for UV index in schematic files. SerialUSB.print(" mW/m^2\n"); return UV_value; } |
Testing Wind Weather Station
Connect the Micro-USB cable to the USB Port of the PCB. And on the other end connect the cable to the computer. Now click on the upload button and the code will be uploaded within few seconds.
Once uploading is done, open the Serial Monitor. You can see the wind speed value along with the Temperature, Pressure, altitude value from BMP280 Sensor. From the DHT11 Sensor, you will see the value for Humidity, Temperature and Heat Index Value. So this means the sensors are working pretty well.
The OLED Display will also display the weather parameter like temperature, humidity, pressure, wind speed, UV Index.
MQTT Based Wind Weather Station using GSM & Arduino
Let’s convert this product into IoT Based product using the GSM GPRS Applications. We will use the MQTT Connection to transmit Weather Station Data using GSM & Arduino. It has a little difficulty if you don’t have any knowledge about MQTT.
Here is a complete code for the MQTT weather Station. You can copy the code and upload it to the Arduino Zero board.
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sendData("AT+CGDCONT=1,\"IP\",\"ntnet\"", 1000, DEBUG); |
From the above line, you need to change the SIM APN. I am staying in Nepal and using Nepal Telecom SIM, so my APN is ntnet. You can check your APN from the service provider.
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#include <stdio.h> #include <string.h> #include <Wire.h> #include <Adafruit_BMP280.h> #include <Adafruit_GFX.h> #include <Adafruit_SSD1306.h> #include <DHT.h> #include <SD.h> #define DEBUG true #define PWR_KEY 9 #define RST_KEY 6 #define LOW_PWR_KEY 5 #define VCC_PIN 2 #define VDD_PIN 7 #define BUZZER_PIN 12 #define SD_CS 4 #define pinInterrupt A0 #define PM_READ_PIN A1 #define PM_LED_PIN 10 #define DHTPIN 13 //#define DHTPIN A0 #define DHTTYPE DHT11 DHT dht(DHTPIN, DHTTYPE); bool ModuleState = false; #define SCREEN_WIDTH 128 // OLED display width, in pixels #define SCREEN_HEIGHT 32 // OLED display height, in pixels #define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin) Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); #define BMP280_I2C_ADDRESS 0x76 #define BMP280_DEVICE_ID 0x58 Adafruit_BMP280 bmp; // I2C int humidity_value = 0; int temperature_value = 0; int speed_value = 0; int pressure_value = 0; int show_index = 0; int Count = 0; int runtime = 0; int sensortime = 0; int dhttime = 0; int Mqtttime = 0; unsigned long lastDebounceTime = 0; // the last time the output pin was toggled unsigned long debounceDelay = 1000; // the debounce time; increase if the output flickers void setup() { SerialUSB.begin(115200); Serial1.begin(115200); pinMode(VDD_PIN, OUTPUT); pinMode(VCC_PIN, OUTPUT); pinMode(BUZZER_PIN, OUTPUT); pinMode(PM_LED_PIN, OUTPUT); pinMode(pinInterrupt, INPUT_PULLUP); attachInterrupt(digitalPinToInterrupt(pinInterrupt), onChange, FALLING); pinMode(PWR_KEY, OUTPUT); pinMode(RST_KEY, OUTPUT); pinMode(LOW_PWR_KEY, OUTPUT); digitalWrite(VDD_PIN, LOW); delay(500); digitalWrite(VDD_PIN, HIGH); digitalWrite(VCC_PIN, LOW); delay(500); digitalWrite(VCC_PIN, HIGH); digitalWrite(BUZZER_PIN, HIGH); delay(500); digitalWrite(BUZZER_PIN, LOW); digitalWrite(RST_KEY, LOW); digitalWrite(LOW_PWR_KEY, HIGH); digitalWrite(PWR_KEY, HIGH); digitalWrite(PWR_KEY, LOW); delay(3000); digitalWrite(PWR_KEY, HIGH); delay(10000); ModuleState = moduleStateCheck(); if (ModuleState == false) //if it's off, turn on it. { digitalWrite(PWR_KEY, LOW); delay(3000); digitalWrite(PWR_KEY, HIGH); delay(10000); SerialUSB.println("Now turnning the A9/A9G on."); } sendData("AT+CCID", 3000, DEBUG); sendData("AT+CREG?", 3000, DEBUG); sendData("AT+CGATT=1", 1000, DEBUG); sendData("AT+CGDCONT=1,\"IP\",\"ntnet\"", 1000, DEBUG); sendData("AT+CGACT=1,1", 1000, DEBUG); sendData("AT+MQTTCONN=\"test.mosquitto.org\",1883,\"mqttx_0931852d35\",120,0", 1000, DEBUG); String topic_W = "AT+MQTTPUB=\"/public/TEST/makerfabs-W\",\""+(String)30+"\",0,0,0"; String topic_T = "AT+MQTTPUB=\"/public/TEST/makerfabs-T\",\""+(String)73.5+"\",0,0,0"; String topic_H = "AT+MQTTPUB=\"/public/TEST/makerfabs-H\",\""+(String)46.8+"\",0,0,0"; String topic_P = "AT+MQTTPUB=\"/public/TEST/makerfabs-P\",\""+(String)pressure_value+"\",0,0,0"; //String topic_H = "AT+MQTTPUB=\"/public/TEST/makerfabs-H\",\""+(String)h+"\",0,0,0"; SerialUSB.println(topic_T); //sendData(topic_T, 1000, DEBUG); SerialUSB.println(topic_H); i2c_dev_init(); logo_show(); dht.begin(); } void loop() { wind_speed(); if ((millis() - sensortime) > 1000) { SerialUSB.println("Read bmp"); bmp_read(); //i2c_scan(); sensortime = millis(); } //DHT is slow if ((millis() - dhttime) > 4000) { SerialUSB.println("Read dht"); dht_read(); dhttime = millis(); } if ((millis() - runtime) > 2000) { sensor_show(); runtime = millis(); } if ((millis() - Mqtttime) > 16000) { String topic_P = "AT+MQTTPUB=\"/public/TEST/makerfabs-P\",\""+(String)pressure_value+" Pa\",0,0,0"; String topic_W = "AT+MQTTPUB=\"/public/TEST/makerfabs-W\",\""+(String)speed_value+" m/s\",0,0,0"; String topic_T = "AT+MQTTPUB=\"/public/TEST/makerfabs-T\",\""+(String)temperature_value+" C\",0,0,0"; String topic_H = "AT+MQTTPUB=\"/public/TEST/makerfabs-H\",\""+(String)humidity_value+" %RH\",0,0,0"; sendData(topic_T, 1000, DEBUG); SerialUSB.println("send T"); sendData(topic_H, 1000, DEBUG); sendData(topic_W, 1000, DEBUG); sendData(topic_P, 1000, DEBUG); Mqtttime = millis(); } } bool moduleStateCheck() { int i = 0; bool moduleState = false; for (i = 0; i < 5; i++) { String msg = String(""); msg = sendData("AT", 1000, DEBUG); if (msg.indexOf("OK") >= 0) { SerialUSB.println("A9/A9G Module had turned on."); moduleState = true; return moduleState; } delay(1000); } return moduleState; } String sendData(String command, const int timeout, boolean debug) { String response = ""; Serial1.println(command); long int time = millis(); while ((time + timeout) > millis()) { while (Serial1.available()) { char c = Serial1.read(); response += c; } } if (debug) { SerialUSB.print(response); } return response; } void i2c_scan() { Wire.begin(); byte error, address; int nDevices; static int s = 0; SerialUSB.print(s++); SerialUSB.println(". Scanning..."); nDevices = 0; for (address = 1; address < 127; address++) { // The i2c_scanner uses the return value of // the Write.endTransmisstion to see if // a device did acknowledge to the address. Wire.beginTransmission(address); error = Wire.endTransmission(); if (error == 0) { SerialUSB.print("I2C device found at address 0x"); if (address < 16) SerialUSB.print("0"); SerialUSB.print(address, HEX); SerialUSB.println(" !"); nDevices++; } else if (error == 4) { SerialUSB.print("Unknown error at address 0x"); if (address < 16) SerialUSB.print("0"); SerialUSB.println(address, HEX); } } if (nDevices == 0) SerialUSB.println("No I2C devices found\n"); else { SerialUSB.print(">>>> Found total "); ; SerialUSB.print(nDevices); SerialUSB.println(" devices\n"); } } void dht_read() { // Reading temperature or humidity takes about 250 milliseconds! // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor) float h = dht.readHumidity(); // Read temperature as Celsius (the default) float t = dht.readTemperature(); // Read temperature as Fahrenheit (isFahrenheit = true) float f = dht.readTemperature(true); // Check if any reads failed and exit early (to try again). if (isnan(h) || isnan(t) || isnan(f)) { SerialUSB.println(F("Failed to read from DHT sensor!")); return; } // Compute heat index in Fahrenheit (the default) float hif = dht.computeHeatIndex(f, h); // Compute heat index in Celsius (isFahreheit = false) float hic = dht.computeHeatIndex(t, h, false); SerialUSB.print(F("Humidity: ")); SerialUSB.print(h); SerialUSB.print(F("% Temperature: ")); SerialUSB.print(t); SerialUSB.print(F("°C ")); SerialUSB.print(f); SerialUSB.print(F("°F Heat index: ")); SerialUSB.print(hic); SerialUSB.print(F("°C ")); SerialUSB.print(hif); SerialUSB.println(F("°F")); humidity_value = (int)h; temperature_value = (int)t; } void bmp_read() { SerialUSB.print(F("Temperature = ")); SerialUSB.print(bmp.readTemperature()); SerialUSB.println(" *C"); SerialUSB.print(F("Pressure = ")); SerialUSB.print(pressure_value = bmp.readPressure()); SerialUSB.println(" Pa"); SerialUSB.print(F("Approx altitude = ")); SerialUSB.print(bmp.readAltitude(1013.25)); /* Adjusted to local forecast! */ SerialUSB.println(" m"); SerialUSB.println(); } void i2c_dev_init() { // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x32 Serial.println(F("SSD1306 allocation failed")); for (;;) ; // Don't proceed, loop forever } SerialUSB.println("SSD1306 found"); if (!bmp.begin(BMP280_I2C_ADDRESS, BMP280_DEVICE_ID)) { SerialUSB.println(F("Could not find a valid BMP280 sensor, check wiring!")); while (1) ; } SerialUSB.println("BMP280 found"); /* Default settings from datasheet. */ bmp.setSampling(Adafruit_BMP280::MODE_NORMAL, /* Operating Mode. */ Adafruit_BMP280::SAMPLING_X2, /* Temp. oversampling */ Adafruit_BMP280::SAMPLING_X16, /* Pressure oversampling */ Adafruit_BMP280::FILTER_X16, /* Filtering. */ Adafruit_BMP280::STANDBY_MS_500); /* Standby time. */ SerialUSB.println("BMP280 init over"); //i2c_scan(); } void logo_show() { display.clearDisplay(); display.setTextColor(SSD1306_WHITE); display.setTextSize(2); // Draw 2X-scale text display.setCursor(10, 0); display.println(F("Makerfabs")); display.setTextSize(1); display.setCursor(10, 16); display.println(F("Weather Station")); display.display(); // Show initial text delay(100); // Scroll in various directions, pausing in-between: display.startscrollright(0x00, 0x01); delay(4000); display.startscrolldiagright(0x00, 0x07); delay(2000); display.startscrolldiagleft(0x00, 0x07); delay(2000); display.stopscroll(); } void sensor_show() { display.clearDisplay(); display.setTextColor(SSD1306_WHITE); display.setTextSize(2); switch (show_index) { case 0: display.setCursor(0, 0); display.print("Temp:"); display.print(temperature_value); display.println(" C"); display.setCursor(0, 16); display.print("Humi:"); display.print(humidity_value); display.println(" %"); break; case 1: display.setCursor(0, 0); display.print("Humi:"); display.print(humidity_value); display.println(" %"); display.setCursor(0, 16); display.print("Wind:"); display.print(speed_value); display.println(" m/s"); break; case 2: display.setCursor(0, 0); display.print("PM2.5:"); display.setCursor(0, 16); display.print(pm25()); display.println(" mg/m3"); break; case 3: display.setCursor(0, 0); display.println("Pressure:"); display.setCursor(0, 16); display.print(pressure_value); display.println(" Pa"); break; } display.display(); // Show initial text show_index++; show_index %= 4; } void wind_speed() { lastDebounceTime = millis(); Count = 0; while(!((millis() - lastDebounceTime) > debounceDelay)); if ((millis() - lastDebounceTime) > debounceDelay) { //lastDebounceTime = millis(); speed_value = Count * 8.75 * 0.01; SerialUSB.print(speed_value); Count = 0; SerialUSB.println("m/s"); } } int pm25() { int samplingTime = 280; int deltaTime = 40; int sleepTime = 9680; float voMeasured = 0; float calcVoltage = 0; float dustDensity = 0; digitalWrite(PM_LED_PIN, HIGH); // power on the LED delayMicroseconds(samplingTime); voMeasured = analogRead(PM_READ_PIN); // read the dust value voMeasured = voMeasured*2.0/3.0;//5V to 3.3V delayMicroseconds(deltaTime); digitalWrite(PM_LED_PIN, LOW); // turn the LED off delayMicroseconds(sleepTime); // 0 - 5V mapped to 0 - 1023 integer values // recover voltage calcVoltage = voMeasured * (5.0 / 1024.0); // linear eqaution taken from http://www.howmuchsnow.com/arduino/airquality/ // Chris Nafis (c) 2012 dustDensity = 170 * calcVoltage - 0.1; //SerialUSB.println(dustDensity); // unit: ug/m3 if(dustDensity < 5) dustDensity = 0; return (int)dustDensity; } void onChange() { if (digitalRead(pinInterrupt) == LOW) Count++; // Serial.println("Key Down"); // else // Serial.println("Key UP"); } |
Checking the data on MQTT Dashboard
First, you have to get an MQTT broker such as the Mosquitto which is used in the demo. Second, define a client ID which is the only one. This is done in the Android App. So download the Android App from the link below.
Open the Android App and type the information to the MQTT client: the server URL is test.mosquitto.org, the server port is 1883, the server name is makerfabs-g.
Use the MQTT client and subscribe to the topics which are “/public/TEST/makerfabs-T“, “/public/TEST/makerfabs-H“, “/public/TEST/makerfabs-W“, “/public/TEST/makerfabs-P“. It will receive the temperature, humidity, pressure and wind speed.
Video Tutorial & Guide
This is how you can design your MQTT Based Wind Weather Station using GSM & Arduino to monitor the Wind Weather Data remotely.
2 Comments
Didn’t read closely enough. This device only has 2G connectivity. There is no other way to get the data off the board so at least in the USA it is basicaly useless. Wifi would have been nice.
I tried to adapt your sketch for the board on the LGTF 28P chip (Chinese clone of Arduino Nano), but when compiling, I got an error stating that we do not have enough flash memory (111% or 33186 bytes with 29696 bytes available). It turns out that a lot of program memory is occupied by the old OLED library from Adafruit. Please, try a lighter library for OLED from russian developer @Alex_Giver: https://github.com/GyverLibs/GyverOLED
It also has lightweight libraries for other sensors, displays, keyboards, various algorithms, and more: https://github.com/GyverLibs