const int gasSensorPin = 14;  // Digital pin from MQ-2 Dout (A0)
const int redLedPin = 1;
const int greenLedPin = 3;
const int buzzerPin = 4;

void setup() {
  pinMode(gasSensorPin, INPUT);
  pinMode(redLedPin, OUTPUT);
  pinMode(greenLedPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int gasDetected = digitalRead(gasSensorPin); // HIGH = No gas, LOW = Gas detected
  Serial.print("Gas Detected: ");
  Serial.println(!gasDetected); // Show 1 when gas is detected

  if (gasDetected == LOW) { // Gas is detected
    digitalWrite(redLedPin, HIGH);
    digitalWrite(greenLedPin, LOW);
    digitalWrite(buzzerPin, HIGH);
    delay(500);
    digitalWrite(buzzerPin, LOW);
    delay(500);
  } else { // No gas
    digitalWrite(redLedPin, LOW);
    digitalWrite(greenLedPin, HIGH);
    digitalWrite(buzzerPin, LOW);
  }

  delay(100);
}