#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include "HX711.h"
#include "DHT.h"
#include <ESP32Servo.h>

// Pin definisi
#define DHTPIN 4
#define DHTTYPE DHT22
#define MQ2PIN 34
#define TRIGPIN 13
#define ECHOPIN 12
#define DT 19
#define SCK 18
#define SERVOPIN 14
#define LEDPIN 27
#define BUZZERPIN 26

// Objek sensor dan perangkat
DHT dht(DHTPIN, DHTTYPE);
HX711 scale;
Servo servo;
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Variabel
bool lidOpen = false;
unsigned long lastOpen = 0;

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

  // Inisialisasi sensor dan perangkat
  dht.begin();
  lcd.init();
  lcd.backlight();
  servo.attach(SERVOPIN);
  servo.write(0); // posisi tertutup

  pinMode(MQ2PIN, INPUT);
  pinMode(TRIGPIN, OUTPUT);
  pinMode(ECHOPIN, INPUT);
  pinMode(LEDPIN, OUTPUT);
  pinMode(BUZZERPIN, OUTPUT);

  // Load Cell
  scale.begin(DT, SCK);
  scale.set_scale(1);  // Ganti nilai ini setelah kalibrasi!
  scale.tare();
}

void loop() {
  // --- Sensor DHT ---
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();

  // --- Sensor MQ-2 ---
  int gasValue = analogRead(MQ2PIN);
  bool gasBahaya = gasValue > 1000;

  // --- Sensor Berat (Load Cell) ---
  float berat = scale.get_units();
  Serial.print("Berat mentah: ");
  Serial.println(scale.get_units());

  // --- Sensor Ultrasonik ---
  long duration;
  float distance;
  digitalWrite(TRIGPIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGPIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGPIN, LOW);
  duration = pulseIn(ECHOPIN, HIGH);
  distance = duration * 0.034 / 2;

  // --- Kontrol Servo berdasarkan jarak ---
  if (distance < 20 && !lidOpen) {
    servo.write(0);  // Buka tutup
    lidOpen = true;
    lastOpen = millis();
  }

  if (lidOpen && millis() - lastOpen > 5000) {
    servo.write(90);   // Tutup kembali setelah 5 detik
    lidOpen = false;
  }

  // --- LCD Display ---
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("H:"); lcd.print(hum); lcd.print("% ");
  lcd.print("W:"); lcd.print(berat, 1); lcd.print("kg");

  lcd.setCursor(0, 1);
  if (gasBahaya) {
    lcd.print("GAS TERDETEKSI!");
    tone(BUZZERPIN, 1000);
    digitalWrite(LEDPIN, (millis() / 200) % 2); // LED berkedip
  } else {
    lcd.print("    GAS AMAN   ");
    noTone(BUZZERPIN);
    digitalWrite(LEDPIN, LOW);
  }

  delay(500);
}