#include "DHT.h"

// Konfigurasi DHT22
#define DHTPIN 2
#define DHTTYPE DHT22
DHT dht (DHTPIN, DHTTYPE);

// Konfigurasi Potensiomter sebagai Simulator MQ-2
#define MQ2_PIN A0 // Pin analog untuk potensiometer

// Pin Output
#define led 12
#define buzzer 11
#define relay 4

// Threshold
const float SUHU_BAHAYA = 60.0;  //  ℃
const float KELEMBABAN_BAHAYA = 30.0; // %
const int GAS_BAHAYA = 200;        // ppm (asap)

void setup () {
  Serial.begin (115200);
  dht.begin();

  pinMode(led, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(relay, OUTPUT);

  Serial.println(F("Sistem Deteksi Kebakaran (Wokwi)"));
}

void loop() {
  // Baca sensor
  float suhu = dht.readTemperature();
  float kelembaban = dht.readHumidity();

  // Baca nilai potensiometer (0-1023)
  int gasValue = analogRead(MQ2_PIN);

  // Validasi data
  if (isnan(suhu) || isnan (kelembaban)) {
    Serial.println(F("Error membaca DHT22!"));
    return;
  }

  // Deteksi bahaya
  bool bahaya = (suhu >= SUHU_BAHAYA) ||
                (kelembaban <= KELEMBABAN_BAHAYA) ||
                (gasValue >= GAS_BAHAYA);

  // Kontrol output
  digitalWrite (led, bahaya ? HIGH : LOW);
  digitalWrite (relay, bahaya ? HIGH : LOW);
  if (bahaya) {
    // Frekuensi 1kHz, durasi 500ms
    tone(buzzer, 500, 1000);
    } else {
      noTone (buzzer) ;
    }

    // Tampilkan data
    Serial.print(F("Suhu: "));
    Serial.print(suhu);
    Serial.print(F("℃ | "));
    Serial.print(F("kelembaban: "));
    Serial.print(kelembaban);
    Serial.print(F("% | "));
    Serial.print(F("Gas: "));
    Serial.print(gasValue);
    Serial.print(F("/1023"));
    delay(2000);
}