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

LiquidCrystal_I2C lcd(0x27, 16, 2); // Alamat default untuk LCD I2C

const int LM35_pin = A0; // Pin untuk sensor LM35
const int button1_pin = 2; // Pin untuk tombol 1
const int button2_pin = 3; // Pin untuk tombol 2
const int button3_pin = 4; // Pin untuk tombol 3
const int buzzer_pin = 5; // Pin untuk buzzer

int temperature = 0;
bool isCelsius = true;
bool programActive = false;

void setup() {
  lcd.init();                      // Inisialisasi LCD
  lcd.backlight();                 // Aktifkan backlight
  pinMode(button1_pin, INPUT);
  pinMode(button2_pin, INPUT);
  pinMode(button3_pin, INPUT);
  pinMode(buzzer_pin, OUTPUT);

  Serial.begin(9600);
}

void loop() {
  if (programActive) {
    int button1State = digitalRead(button1_pin);
    int button2State = digitalRead(button2_pin);
    int button3State = digitalRead(button3_pin);

    

    if (button1State == HIGH && temperature < 60) {
      temperature += 10;
      delay(200); // Debouncing
    }

    if (button2State == HIGH && temperature > 0) {
      temperature -= 10;
      delay(200); // Debouncing
    }

    if (button3State == HIGH) {
      isCelsius = !isCelsius;
      delay(200); // Debouncing
    }

    if (temperature < 10) {
      digitalWrite(6, HIGH); // LED 1 menyala
      digitalWrite(7, LOW);
      digitalWrite(8, LOW);
      digitalWrite(9, LOW);
      digitalWrite(10, LOW);
    } else if (temperature > 50) {
      digitalWrite(6, LOW);
      digitalWrite(7, LOW);
      digitalWrite(8, LOW);
      digitalWrite(9, LOW);
      digitalWrite(10, HIGH); // LED 5 menyala

      // Bunyikan buzzer saat suhu > 45 derajat
    if (temperature > 50) {
  // Bagian lain dari kode
  if (temperature >= 45) { // Mengubah kondisi menjadi ">=" agar sesuai dengan kasus >45 derajat
    tone(buzzer_pin, 1000); // Mengaktifkan buzzer saat suhu >=45 derajat
  } else {
    noTone(buzzer_pin); // Mematikan buzzer jika suhu <45 derajat
  }
}
    } else {
      int ledNum = (temperature - 10) / 10; // Hitung nomor LED berdasarkan suhu
      for (int i = 6; i <= 10; i++) {
        if (i == (ledNum + 6)) {
          digitalWrite(i, HIGH); // LED sesuai dengan rentang suhu menyala
        } else {
          digitalWrite(i, LOW); // Matikan LED lainnya
        }
      }
      noTone(buzzer_pin); // Matikan buzzer jika suhu dalam rentang aman
    }

    lcd.setCursor(0, 0);
    lcd.print("Suhu: ");
    if (isCelsius) {
      lcd.print(temperature);
      lcd.print(" C");
    } else {
      int tempF = celsiusToFahrenheit(temperature);
      lcd.print(tempF);
      lcd.print(" F");
    }

    delay(1000); // Update setiap detik
  } else {
    // Matikan semua LED dan tampilkan pesan
    for (int i = 6; i <= 10; i++) {
      digitalWrite(i, LOW);
    }
  }

  // Aktifkan atau nonaktifkan program dengan tombol 3
  if (digitalRead(button3_pin) == HIGH) {
    programActive = !programActive;
    delay(200); // Debouncing
  }
   if (programActive) {
     Serial.print("Suhu: ");
    if (isCelsius) {
      Serial.print(temperature);
      Serial.println(" C");
    } else {
      int tempF = celsiusToFahrenheit(temperature);
      Serial.print(tempF);
      Serial.println(" F");
    }
  }

}

int celsiusToFahrenheit(int celsius) {
  return celsius * 9 / 5 + 32;
}