// LIBARARY ARDUINO NANO RTC AND LCD I2C ADAFRUIT :
#include <Wire.h>
#include "RTClib.h"
#include <LiquidCrystal_I2C.h>

// SERIAL RTC AND LCD I2C :
RTC_DS1307 rtc;
LiquidCrystal_I2C lcd(0x27, 16, 2);

//INTRODUCING THE DAY IN RTC :
char daysOfTheWeek[7][12] = {"Minggu", "Senin", "Selasa", "Rabu", "Kamis", "Jumat", "Sabtu"}; 

void setup() {

  // SET RTC AND LCD I2C :
  lcd.init ();
  lcd.backlight ();
  while (!Serial); // for Leonardo/Micro/Zero

  Serial.begin(57600);
  if (! rtc.begin()) { 
    lcd.println("Couldn't find RTC"); // ! artinya tidak sama dengan 
    while (1);
  }

  if (! rtc.isrunning()) {
    lcd.println("RTC is NOT running!");
    // Kalau mau program pertama harus disetting dahulu dengan menghapus commandnya dahulu 
    
    //following line sets the RTC to the date & time this sketch was compiled
    //rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    // This line sets the RTC with an explicit date & time, for example to set
    // November 20, 2023 at 3am you would call:
    // rtc.adjust(DateTime(2023, 11, 20, 11, 10, 0));

} }

void loop() {

  // DISPLAY IN LCD I2C :
    DateTime now = rtc.now(); 
    
    lcd.setCursor (3,0);
    lcd.print(now.year(), DEC);
    lcd.print('/');
    lcd.print(now.month(), DEC);
    lcd.print('/');
    lcd.print(now.day(), DEC);
    lcd.setCursor ( 1,1 );
    lcd.print(daysOfTheWeek[now.dayOfTheWeek()]);
    lcd.print (" ,");
    lcd.print(now.hour(), DEC);
    lcd.print(':');
    lcd.print(now.minute(), DEC);
    lcd.print(':');
    lcd.print(now.second(), DEC);
    lcd.println();
    
    delay ( 1000 );

}


// NAMA  : MUHAMMAD RAFI BAIHAQI
// KELAS : 12 LISTRIK 1
// ABSEN : 26