#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <OneWire.h>
#include <DallasTemperature.h>

// Inisialisasi LCD I2C (0x27 alamat LCD, 16x2 ukuran LCD)
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Inisialisasi sensor DS18B20
#define ONE_WIRE_BUS 3 // Pin sensor suhu DS18B20
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

// Inisialisasi Relay
#define RELAY_HEATER 4  // Relay pemanas
#define RELAY_FAN 5     // Relay pendingin

void setup() {
  lcd.begin(16, 2); // Menentukan ukuran LCD 16x2
  lcd.backlight();

  pinMode(RELAY_HEATER, OUTPUT);
  pinMode(RELAY_FAN, OUTPUT);

  digitalWrite(RELAY_HEATER, LOW); // Awalnya mati
  digitalWrite(RELAY_FAN, LOW); // Awalnya mati

  sensors.begin(); // Memulai sensor DS18B20
}

void loop() {
  sensors.requestTemperatures(); // Mengambil data suhu
  float suhu = sensors.getTempCByIndex(0); // Membaca suhu dalam Celcius

  lcd.setCursor(0, 0);
  lcd.print("Suhu: ");
  lcd.print(suhu);
  lcd.print(" C ");

  if (suhu > 30) { 
    digitalWrite(RELAY_FAN, HIGH);  // Kipas pendingin ON
    digitalWrite(RELAY_HEATER, LOW); // Pemanas OFF
    lcd.setCursor(0, 1);
    lcd.print("Pendingin Aktif ");
  } 
  else if (suhu < 20) { 
    digitalWrite(RELAY_FAN, LOW);  // Kipas pendingin OFF
    digitalWrite(RELAY_HEATER, HIGH); // Pemanas ON
    lcd.setCursor(0, 1);
    lcd.print("Pemanas Aktif  ");
  } 
  else { 
    digitalWrite(RELAY_FAN, LOW);  // Kipas pendingin OFF
    digitalWrite(RELAY_HEATER, LOW); // Pemanas OFF
    lcd.setCursor(0, 1);
    lcd.print("Stabil          ");
  }

  delay(2000); // Tunggu 2 detik sebelum membaca ulang suhu
}