#include <LiquidCrystal_I2C.h>
#include <RTClib.h>
#include <Servo.h>

LiquidCrystal_I2C lcd(0x27,16,2);
RTC_DS1307 RTC;
//RTC_DS3231 RTC;

unsigned long waktu_sebelumnya = 0;
const int buzzer=11;
const int relay=9;

Servo servo1;

void setup() {
  lcd.init();
  lcd.backlight();
  RTC.begin();
  pinMode(buzzer,OUTPUT);
  pinMode(relay, OUTPUT);
  digitalWrite(relay,HIGH); //memastikan keadaan awal relay mati
  servo1.attach(10);
  servo1.write(0); // katup tertutup
  lcd.setCursor(4,0);
  lcd.print("Project");
  lcd.setCursor(2,1);
  lcd.print("Jam Digital");
  delay(3000);
  lcd.clear();
}

void loop() {
  //tone(buzzer,500);
  //digitalWrite(buzzer,HIGH);
  unsigned long waktu_sekarang = millis();
  DateTime baca_rtc = RTC.now();
  tampilan_utama();

  int alarm_jam=24;
  int alarm_menit=00;

  if (baca_rtc.hour() == alarm_jam && baca_rtc.minute() == alarm_menit)
  {
    tone(buzzer,500);
    servo1.write(180); // katup terbuka
    digitalWrite(relay,LOW); //Relay menyala
    lcd.setCursor(0,1);
    lcd.print(" Waktunya Makan ");
    delay(3000);
    lcd.clear();
    while (baca_rtc.hour() == alarm_jam && baca_rtc.minute() == alarm_menit)
    {
      tampilan_utama();
      noTone(buzzer);
      servo1.write(0); // katup tertutup
      digitalWrite(relay,HIGH);
    }
  }
  if(waktu_sekarang - waktu_sebelumnya >= 10800000) // Tiap 3 Jam (60000 detik = 1 menit (60000 x 60 menit = 3600000 x 3 jam = 10800000))
  {
    waktu_sebelumnya = waktu_sekarang;
    tone(buzzer,500);
    servo1.write(180); // katup terbuka
    digitalWrite(relay,LOW); //Relay menyala
    lcd.setCursor(0,1);
    lcd.print(" Waktunya Makan ");
    delay(3000);
    lcd.clear();
  }

  else 
  {
    noTone(buzzer);
    servo1.write(0); // katup tertutup\
    digitalWrite(relay,HIGH);
  }
}

 void tampilan_utama()
{
  DateTime baca_rtc = RTC.now();
  lcd.setCursor(0,0);
  lcd.print("DATE: ");
  lcd.print(baca_rtc.year());
  lcd.print("/");
  lcd.print(baca_rtc.month());
  lcd.print("/");
  lcd.print(baca_rtc.day());
  lcd.setCursor(0,1);
  lcd.print("TIME: ");
  lcd.print(baca_rtc.hour());
  lcd.print("/");
  lcd.print(baca_rtc.minute());
  lcd.print("/");
  lcd.print(baca_rtc.second());
  lcd.print("  ");
}