int buzzer = D0;
int smoke = A0;
int sensorThres = 400;

void setup() {
  pinMode(buzzer, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int analogSensor = analogRead(smoke);

  Serial.print("Pin A0: ");
  Serial.println(analogSensor);
  // Checks if it has reached the threshold value
  if (analogSensor > sensorThres) {
    digitalWrite(buzzer, HIGH);
  }
  else {
    digitalWrite(buzzer, LOW);
  }
  delay(100);
}

//@ApePanthiya ICT