#include <DHT.h>

// Pin konfigurasi
#define DHTPIN 15        // DHT22 di pin GPIO15
#define DHTTYPE DHT22    // Tipe sensor DHT
#define FLAME_PIN 4      // Flame sensor di pin GPIO4
#define MQ2_PIN 34       // MQ-2 sensor analog di pin GPIO34

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  dht.begin();
  pinMode(FLAME_PIN, INPUT);
}

float estimatePPM(int analogValue) {
  // Kalibrasi sederhana berbasis eksperimen: cocok untuk simulasi Wokwi
  // Nilai analog 843 ~ udara normal (0 ppm), >1000 mulai terdeteksi gas
  float ppm = (analogValue < 850) ? 0 : (analogValue - 850) * 10;
  return ppm;
}

void loop() {
  delay(1000); // 1 detik antar pembacaan

  float temp = dht.readTemperature();
  float hum = dht.readHumidity();
  int gasValue = analogRead(MQ2_PIN);
  float ppm = estimatePPM(gasValue);
  int flame = digitalRead(FLAME_PIN);

  // Tampilkan suhu, kelembaban, gas, dan flame
  Serial.print("Temp: ");
  Serial.print(temp);
  Serial.print(" C, Hum: ");
  Serial.print(hum);
  Serial.print(" %, Gas: ");
  Serial.print(gasValue);
  Serial.print(" (Est. ");
  Serial.print(ppm);
  Serial.print(" ppm) - ");

  // Klasifikasi gas
  if (ppm >= 5000) {
    Serial.print("Kemungkinan CH4, ");
  } else if (ppm >= 3000) {
    Serial.print("Kemungkinan Asap, ");
  } else if (ppm >= 2000) {
    Serial.print("Kemungkinan LPG, ");
  } else if (ppm >= 1000) {
    Serial.print("Kemungkinan CO, ");
  } else if (ppm > 0) {
    Serial.print("Konsentrasi Rendah, ");
  } else {
    Serial.print("Udara Aman, ");
  }

  // Flame detection
  Serial.print("Flame: ");
  Serial.println(flame);
}