#include "RTClib.h"
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
RTC_DS1307 rtc;
#define tombol1 2
#define tombol2 3
#define led1    8

int jam,menit,detik,tgl,bulan,tahun;
int menu;
char buff[33];

void setup() {
  pinMode(tombol1, INPUT_PULLUP);
  pinMode(tombol2, INPUT_PULLUP);
  pinMode(led1,OUTPUT);
  lcd.init(); lcd.backlight();
  lcd.setCursor(0,0); lcd.print("  JAM DIGITAL  "); 
  lcd.setCursor(0,1);
  if (!rtc.begin()) lcd.print("RTC ERRORR");
  else              lcd.print("RTC Okeeee");
  delay(1000); lcd.clear();
}

void loop() {
  if(digitalRead(tombol1)==LOW) {
    menu = menu+1; delay(300);
  }

  if(menu==0) {
    DateTime now = rtc.now();
    jam   = now.hour();
    menit = now.minute();
    detik = now.second();
    tgl   = now.day();
    bulan = now.month();
    tahun = now.year();
    sprintf(buff,"JAM %02d:%02d:%02d WIB",jam,menit,detik);
    lcd.setCursor(0,0); lcd.print(buff); delay(300);
    sprintf(buff,"JAM %02d %02d %02d WIB",jam,menit,detik);
    lcd.setCursor(0,0); lcd.print(buff); delay(300);
  }
  else if(menu==1) {
    lcd.setCursor(0,0); lcd.print("   SETTING JAM   ");
    sprintf(buff,"JAM %02d:%02d:%02d WIB",jam,menit,detik);
    lcd.setCursor(0,1); lcd.print(buff);
  }
  else if(menu==2) {
    lcd.setCursor(0,0); lcd.print("  SETTING MENIT  ");
    sprintf(buff,"JAM %02d:%02d:%02d WIB",jam,menit,detik);
    lcd.setCursor(0,1); lcd.print(buff);
  }
  else if(menu==3) {
    lcd.setCursor(0,0); lcd.print("   SETTING TGL   ");
    sprintf(buff," TGL %02d-%02d-%04d ",tgl,bulan,tahun);
    lcd.setCursor(0,1); lcd.print(buff);
  }
  else {
    menu=0;
  }
}