// Pin Definition
#define MQ135_PIN 34      // Sensor gas MQ135
#define EXHAUST_PIN 26    // Relay Exhaust
#define SPRINKLER_PIN 27  // Relay Sprinkler

void setup() {
  Serial.begin(115200);
  
  // Setup pin mode
  pinMode(EXHAUST_PIN, OUTPUT);
  pinMode(SPRINKLER_PIN, OUTPUT);
  
  // Initial state
  digitalWrite(EXHAUST_PIN, LOW);
  digitalWrite(SPRINKLER_PIN, LOW);
  
  Serial.println("System Started!");
  Serial.println("Gas Monitor System");
  Serial.println("================");
}

void loop() {
  // Baca sensor
  int gasLevel = analogRead(MQ135_PIN);
  
  // Tampilkan data ke Serial Monitor
  Serial.print("Gas Level: ");
  Serial.println(gasLevel);
  
  // Logic otomatis
  if(gasLevel > 200) {  // Deteksi asap
    digitalWrite(EXHAUST_PIN, HIGH);
    digitalWrite(SPRINKLER_PIN, HIGH);
    Serial.println("PERINGATAN: Asap Terdeteksi!");
    Serial.println("Status: Exhaust ON, Sprinkler ON");
  }
  else if(gasLevel > 100) {  // Gas berbahaya
    digitalWrite(EXHAUST_PIN, HIGH);
    digitalWrite(SPRINKLER_PIN, LOW);
    Serial.println("PERINGATAN: Gas Berbahaya!");
    Serial.println("Status: Exhaust ON, Sprinkler OFF");
  }
  else {
    digitalWrite(EXHAUST_PIN, LOW);
    digitalWrite(SPRINKLER_PIN, LOW);
    Serial.println("Status: Normal");
    Serial.println("Status: Exhaust OFF, Sprinkler OFF");
  }
  
  Serial.println("================");
  delay(1000);  // Delay 1 detik
}