/* CCs The following code is based on the work of the following people. MeshTastic: https://meshtastic.org/docs/getting-started/ SGP30: AdaFruit example code - https://learn.adafruit.com/adafruit-sgp30-gas-tvoc-eco2-mox-sensor/arduino-code SCD30: AdaFruit example code from Arduino IDE OLED Screen: Rui Santos : https://randomnerdtutorials.com/esp32-ssd1306-oled-display-arduino-ide/ LED: FastLED example code from Arduino IDE VMA320 Code from here : https://learn.adafruit.com/thermistor/using-a-thermistor Some debugging was done with ChatGPT Code arrangement by me: Patrick Dezséri */ /* //Basic Library #include #define RX_PIN 44 //RX Pin of your controller that will send the data to the MeshTastic Node #define TX_PIN 43 //TX Pin of your controller that will send the data to the MeshTastic Node // Math library #include // I2C Communication #include // SCD30 - CO2 Sensor #include Adafruit_SCD30 SCD30; void SCD30_STAR(bool); //function to initialize the CO2 Sensor - SCD30 void SCD30_Sensor(); //CO2 Sensor - SCD30 float SCD30_T; float SCD30_Humidity; float SCD30_CO2; // I2C Scanner ----------- void I2C_Scan(); //I2C Scanner, no Pin required, To check I2C devices connected to the board // For the OLED Display #include #include #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) #define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32 Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); #include void OLED_STAR(bool initialize); //function to initialize the OLED Display void OLED_DISPLAY(); //function to display the data on the OLED Display //LED void BlinkLED(int time); // ---------- Setup ---------- void setup() { Serial.begin(115200); // USB for debug Serial1.begin(921600, SERIAL_8N1, RX_PIN, TX_PIN); // UART for Meshtastic node Wire.begin(); // Initialize I2C communication pinMode(LED_BUILTIN, OUTPUT); // Set the built-in LED as output // Initialize the CO2 Sensor - SCD30 SCD30_STAR(true); // Initialize the OLED Display OLED_STAR(true); } // ---------- Loop ---------- void loop() { //I2C_Scan(); // Uncomment to scan I2C devices //Sensors SCD30_Sensor(); //OLED Screen OLED_DISPLAY(); // UART to Node (Meshtastic) Serial1.println(""); Serial1.print("T: "); Serial1.print(SCD30_T); Serial1.println(" °C"); Serial1.print("Humidity: "); Serial1.print(SCD30_Humidity); Serial1.println(" %"); Serial1.print("Co2: "); Serial1.print(SCD30_CO2); Serial1.println(" ppm"); BlinkLED(1500); delay(5000); } // ---------- Function definitions ---------- // ---------- CO2, T and Humidity Sensor - Sensirion SCD30 void SCD30_STAR(bool initialize){ Serial.println("Adafruit SCD30 test!"); // Try to initialize! if (!SCD30.begin()) { Serial.println("Failed to find SCD30 chip"); while (1) { delay(10); } } Serial.println("SCD30 Found!"); // if (!SCD30.setMeasurementInterval(10)){ // Serial.println("Failed to set measurement interval"); // while(1){ delay(10);} // } Serial.print("Measurement Interval: "); Serial.print(SCD30.getMeasurementInterval()); Serial.println(" seconds"); } void SCD30_Sensor(){ if (SCD30.dataReady()){ Serial.println("Data available!"); if (!SCD30.read()){ Serial.println("Error reading sensor data"); SCD30_CO2 =-1; SCD30_Humidity=-1; SCD30_T=-1;; } //Serial.print("Temperature: "); //float T = SCD30.temperature; SCD30_T = SCD30.temperature; SCD30_T = round(SCD30_T * 10.0) / 10.0; //Serial.print(SCD30_T); //Serial.println(" degrees C"); //Serial.print("Relative Humidity: "); //float Humidity = SCD30.relative_humidity; SCD30_Humidity = SCD30.relative_humidity; SCD30_Humidity = round(SCD30_Humidity * 10.0) / 10.0; //Serial.print(SCD30_Humidity); //Serial.println(" %"); //Serial.print("CO2: "); //float CO2 = SCD30.CO2; SCD30_CO2 = SCD30.CO2; SCD30_CO2 = round(SCD30_CO2 * 10.0) / 10.0; //Serial.print(SCD30_CO2); //Serial.println(" ppm"); //Serial.println(""); } else { //Serial.println("No data"); //SCD30_CO2 =-1; //SCD30_Humidity=-1; //SCD30_T=-1; } delay(100); } // ---------- Integrated LED Blinking void BlinkLED(int time) { digitalWrite(LED_BUILTIN, HIGH); Serial.println("ON"); delay(time); digitalWrite(LED_BUILTIN, LOW); delay(time); Serial.println("OFF"); } // ---------- I2C Scanner void I2C_Scan() { byte error, address; int nDevices; Serial.println("Scanning..."); nDevices = 0; for(address = 1; address < 127; address++ ) { Wire.beginTransmission(address); error = Wire.endTransmission(); if (error == 0) { Serial.print("I2C device found at address 0x"); if (address<16) { Serial.print("0"); } Serial.println(address,HEX); nDevices++; } else if (error==4) { Serial.print("Unknown error at address 0x"); if (address<16) { Serial.print("0"); } Serial.println(address,HEX); } } if (nDevices == 0) { Serial.println("No I2C devices found\n"); } else { Serial.println("done\n"); } delay(5000); } // ---------- OLED Display void OLED_STAR(bool initialize){ // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) { Serial.println(F("SSD1306 allocation failed")); for(;;); // Don't proceed, loop forever } // Show initial display buffer contents on the screen -- // the library initializes this with an Adafruit splash screen. display.display(); delay(2000); // Pause for 2 seconds // Clear the buffer display.clearDisplay(); } void OLED_DISPLAY(){ // Clear the display buffer display.clearDisplay(); // Text Settings display.setTextSize(1); // Normal 1:1 pixel scale display.setFont(); // Choose a font display.setTextColor(WHITE); // Draw white text display.setCursor(0, 0); // Start at top-left corner display.setRotation(0); // Rotate the display 0 to 3 times 90 degrees // Display the values display.print("Temp: "); display.print(SCD30_T); display.println(" C"); display.print("CO2: "); display.print(SCD30_CO2); display.println(" ppm"); display.print("Humidity: "); display.print(SCD30_Humidity); display.println(" %"); // Display the buffer contents on the screen display.display(); } //*/