MQ2 Smoke Detector

• TOSEI says:

  May 6, 2020 at 11:12 am

  TEST OK:

  HARDWARE
  Osoyoo UNO Board (Fully compatible with Arduino UNO rev.3) x 1
  MQ2 Smoke Detector x 1
  M/M jumpers
  USB Cable x 1
  PC x 1

  Pin Definitions :
  VCC : 3.3V-5V ⇔ UNO 5V
  GND : The Ground ⇔　UNO GND
  A0 : I/O Interface of MQ2 ⇔　UNO PIN A0

  Sample source :
  volatile float sensorValue;

  volatile float sensorVolt;

  volatile float RS_air;

  volatile float R0;

  volatile float rate;

  void setup()

  {

  Serial.begin(9600);

  sensorValue = analogRead(A0);

  sensorVolt = (sensorValue / 1024) * 5.0;

  RS_air = (5.0 – sensorVolt) / sensorVolt;

  R0 = RS_air / 9.8;

  rate = RS_air / R0;

  }

  void loop()

  {

  for (int x = 0; x <= 100; x = x + (1)) {

  sensorValue = sensorValue + analogRead(A0);

  }

  sensorValue = sensorValue / 100.0;

  Serial.print("sensorValue = ");

  Serial.print(sensorValue);

  Serial.println("");

  Serial.print("sensor_volt = ");

  Serial.print(sensorVolt);

  Serial.println("v");

  Serial.print("R0 = ");

  Serial.print(R0);

  Serial.println("R0");

  Serial.print("rate = ");

  Serial.print(rate);

  Serial.println("%");

  delay(1000);

  }

  Log in to Reply