#include <LiquidCrystal_I2C.h>  // Library LCD I2C
#include <RTClib.h> // Library Real Time Clock (RTC)
#include <Wire.h>   // Library untuk I2C

#define SERIAL_OPTION 0  // Komunikasi Serial=0, Tidak=0

LiquidCrystal_I2C lcd(0x27,16,2); // Alamat I2C: 0x3F atau 0x27
RTC_DS1307 RTC;

void setup() {
  if (SERIAL_OPTION) Serial.begin(9600);   // Inisialisasi Komunikasi Serial

  lcd.init();   // Inisialisasi LCD
  lcd.backlight();  // Nyalakan Backlight LCD

  RTC.begin();    // Mulai Real Time Clock

  // RTC.adjust(DateTime(2022,9,30,18,13,40));  // Hanya gunakan sekali untuk mengatur waktu dan tanggal awal, kemudian komentar baris ini
}

void loop() {
  
  DateTime now = RTC.now();

  if (SERIAL_OPTION) {
    Serial.print(now.year()); Serial.print("/");
    Serial.print(now.month()); Serial.print("/");
    Serial.print(now.day()); Serial.print(" ");

    Serial.print(now.hour()); Serial.print(":");
    Serial.print(now.minute()); Serial.print(":");
    Serial.print(now.second()); Serial.print("\n");
  }
  
  lcd.setCursor(0,0); lcd.print("TANGGAL: ");
  lcd.print(now.year()); lcd.print("/"); lcd.print(now.month()); lcd.print("/"); lcd.print(now.day());
  lcd.setCursor(0,1); lcd.print("WAKTU: ");
  lcd.print(now.hour()); lcd.print(":"); lcd.print(now.minute()); lcd.print(":"); lcd.print(now.second());

  delay(1000);
}