#define GAS_PIN A0
#define BUZZER_PIN 7
#define THRESHOLD 400
void setup() {
  pinMode(GAS_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  Serial.begin(9600);
  Serial.println("Sistem Pendeteksi Gas MQ-2 Aktif...");
}

void loop() {
  int gasValue = analogRead(GAS_PIN); 
  Serial.print("Nilai Gas: ");
  Serial.println(gasValue);
  if (gasValue > THRESHOLD) {
    tone(BUZZER_PIN, 1000);
    Serial.println("BAHAYA: Kebocoran Gas Terdeteksi!");
  } else {
    noTone(BUZZER_PIN);
  }
  delay(500);
}