Build Instructions

Collapse

• 1

  Run a Program

  // The load resistance on the board #define RLOAD 22.0 #include "MQ135.h" #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);
  MQ135 gasSensor = MQ135(A0);
  int val;
  int sensorPin = A0;
  int sensorValue = 0;
  void setup() {
  Serial.begin(9600);
  pinMode(sensorPin, INPUT);
  display.begin(SSD1306_SWITCHCAPVCC);
  display.clearDisplay();
  display.display();
  }
  void loop() {
  val = analogRead(A0);
  Serial.print ("raw = ");
  Serial.println (val);
  // float zero = gasSensor.getRZero();
  // Serial.print ("rzero: ");
  //Serial.println (zero);
  float ppm = gasSensor.getPPM();
  Serial.print ("ppm: ");
  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(ppm);
  display.display();
  display.clearDisplay();
  delay(2000);
  }

View all instructions