int gasPin = A0;   // Pin sensor gas MQ-2
int ledPin = 8;    // LED indikator
int gasValue;      // Variabel penyimpan data gas
int batas = 300;   // Ambang batas (bisa disesuaikan)

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(gasPin, INPUT);
}

void loop() {
  gasValue = analogRead(gasPin);  // Membaca sensor gas

  if (gasValue > batas) {
    digitalWrite(ledPin, HIGH);   // LED menyala → bahaya
  } else {
    digitalWrite(ledPin, LOW);    // LED mati → aman
  }

  delay(300);
}