Build Instructions

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  Run a Program

  int sensorIn = A4;
  #include
  #include
  #include
  #define SCREEN_WIDTH 128 // OLED display width, in pixels
  #define SCREEN_HEIGHT 64 // OLED display height, in pixels
  // Declaration for SSD1306 display connected using software SPI (default case):
  #define OLED_MOSI 9
  #define OLED_CLK 10
  #define OLED_DC 11
  #define OLED_CS 12
  #define OLED_RESET 13
  Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT,
  OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);
  void setup(){
  Serial.begin(9600);
  // Set the default voltage of the reference voltage
  analogReference(DEFAULT);
  display.begin(SSD1306_SWITCHCAPVCC);
  display.clearDisplay();
  display.display();
  }
  void loop(){
  //Read voltage
  int sensorValue = analogRead(sensorIn);
  // The analog signal is converted to a voltage
  float voltage = sensorValue*(5000/1024.0);
  if(voltage == 0)
  {
  Serial.println("Fault");
  }
  else if(voltage < 400)
  {
  Serial.println("preheating");
  }
  else
  {
  int voltage_diference=voltage-400;
  float concentration=voltage_diference*50.0/16.0;
  // Print Voltage
  Serial.print("voltage: ");
  Serial.print(voltage);
  Serial.println("mv");
  //Print CO2 concentration
  Serial.print("CO2 Concentration: ");
  Serial.print(concentration);
  Serial.println("ppm");
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(18,43);
  display.println("CO2");
  display.setCursor(63,43);
  display.println("(PPM)");
  display.setTextSize(2);
  display.setCursor(28,5);
  display.println(concentration);
  display.display();
  display.clearDisplay();
  }
  delay(2000);
  }

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