#include <RTClib.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
RTC_DS1307 rtc;

#define tombol1  5
#define tombol2  6
#define tombol3  7
#define led     13
int menu,jam,menit,detik,tanggal,bulan,tahun;
char tampil[20];

void setup() {
  lcd.backlight(); lcd.init();
  lcd.setCursor(0,0); lcd.print("  JAM DIGITAL  ");
  if(rtc.begin()) {
    lcd.setCursor(0,1); lcd.print("  RTC OKE  ");
  }
  else {
    lcd.setCursor(0,1); lcd.print("  RTC ERROR  ");
  }
  delay(2000);
  pinMode(tombol1, INPUT_PULLUP);
  pinMode(tombol2, INPUT_PULLUP);
  pinMode(tombol3, INPUT_PULLUP);
  pinMode(led,OUTPUT);
}

void loop() {
  DateTime now = rtc.now();
  jam     = now.hour();
  menit   = now.minute();
  detik   = now.second();
  tanggal = now.day();
  bulan   = now.month();
  tahun   = now.year();
  if(digitalRead(tombol2)==LOW) {
    menu = menu + 1;
    delay(300);
  }
  
  if(menu==0) {
    lcd.setCursor(0,0); lcd.print("  JAM DIGITAL  ");
    sprintf(tampil,"JAM %02d:%02d:%02d WIB",jam,menit,detik);
    lcd.setCursor(0,1); lcd.print(tampil);
  }
  else if(menu==1) {
    lcd.setCursor(0,0); lcd.print("  SETTING JAM  ");
    lcd.setCursor(0,1); lcd.print("Jam     = "); lcd.print(jam);
    lcd.print("     ");
  }
  else if(menu==2) {
    lcd.setCursor(0,0); lcd.print(" SETTING MENIT ");
    lcd.setCursor(0,1); lcd.print("Menit   = "); lcd.print(menit);
    lcd.print("     ");
  }
  else if(menu==3) {
    lcd.setCursor(0,0); lcd.print(" SETTING TANGAL");
    lcd.setCursor(0,1); lcd.print("Tanggal = "); lcd.print(tanggal);
    lcd.print("     ");
  }
  else if(menu==4) {
    lcd.setCursor(0,0); lcd.print(" SETTING BULAN ");
    lcd.setCursor(0,1); lcd.print("Bulan  = "); lcd.print(bulan);
    lcd.print("     ");
  }
  else if(menu==5) {
    lcd.setCursor(0,0); lcd.print(" SETTING TAHUN ");
    lcd.setCursor(0,1); lcd.print("Tahun  = "); lcd.print(tahun);
    lcd.print("     ");
  }
  else menu=0;
}