GAS LEAKGE DETECTION SENSOR || MQ-135 GAS SENSOR || ANY GAS LEAKAGE DETE...

CIRCUIT:-

CODE:-

int BUZZER = 11;

int GAS_SENSOR = A0;

int SENSORTHRESHOLD = 200;

void setup() {

  Serial.begin(9600);

pinMode(BUZZER, OUTPUT);

pinMode(GAS_SENSOR, INPUT);

}

void loop() {

  int SENSOR = analogRead(GAS_SENSOR);

  

  if(SENSOR-50 > SENSORTHRESHOLD){

tone(BUZZER, 1000); // Send 1KHz sound signal...

  delay(500);        // ...for 1 sec

  noTone(BUZZER);     // Stop sound...

  delay(500);        // ...for 1sec

    }

   Serial.println(SENSOR-50);

   }