#include "RTClib.h"
RTC_DS1307 rtc;
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);
char buffer[20];
char Day[7][7]= {"Minggu","Senin","Selasa","Rabu","Kamis","Jumat","Sabtu"};


void lcdv()
{
  lcd.init();
  lcd.backlight();
  lcd.clear();
}

void rtcv()
{
      if(!rtc.begin())
    {
      lcd.home();
      lcd.print("RTC Not OK, time set"); 
      delay(1000);
      abort();
    }

  
    if(!rtc.isrunning()) 
    {
    lcd.home();
    lcd.print("RTC Not OK, time set");  
    delay(1000);
    rtc.adjust(DateTime (F(__DATE__),F(__TIME__)));
    }

}

void loop()
{
DateTime waktu=rtc.now();
lcd_display(waktu);
serial_display(waktu);
delay(1000);
}

void lcd_display(DateTime waktu)
{
lcd.setCursor(0,0);
lcd.print(Day[waktu.dayOfTheWeek()]); 
lcd.setCursor(0,1);
lcd.print(waktu.hour()); 
lcd.setCursor(2,1);
lcd.print(":"); 
lcd.setCursor(3,1);
lcd.print(waktu.minute()); 
lcd.setCursor(5,1);
lcd.print(":");  
lcd.setCursor(6,1);
lcd.print(waktu.second()); 


sprintf (buffer, "%s %02d/%02d/%4d",Day[waktu.dayOfTheWeek()],waktu.day(),waktu.month(),waktu.year() );

lcd.setCursor(0,2);
lcd.print(buffer);

sprintf (buffer, "%02d:%02d:%02d",waktu.hour(),waktu.minute(),waktu.second() );
lcd.setCursor(0,3);
lcd.print(buffer);
}

void serial_display(DateTime waktu)
{
sprintf (buffer, "%s %02d/%02d/%4d",Day[waktu.dayOfTheWeek()],waktu.day(),waktu.month(),waktu.year() );
Serial.print(buffer);

sprintf (buffer, " %02d:%02d:%02d",waktu.hour(),waktu.minute(),waktu.second() );

Serial.println(buffer);

}

void setup()
{

Serial.begin(9800);
lcdv();
rtcv();
}