#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include "RTClib.h"
LiquidCrystal_I2C lcd(0x27, 20, 4);
RTC_DS3231 rtc;
void scanI2C() {
  Serial.println("Scanning I2C devices...");
  for (byte addr = 1; addr < 127; addr++) {
    Wire.beginTransmission(addr);
    if (Wire.endTransmission() == 0) {
      Serial.print("Found device at 0x");
      if (addr < 16) Serial.print("0");
      Serial.println(addr, HEX);
    }
  }
}
void print2dLCD(int val) { if (val < 10) lcd.print("0"); lcd.print(val); }
void print2dSerial(int val) { if (val < 10) Serial.print("0"); Serial.print(val); }
void setup() {
  Wire.begin();
  Serial.begin(9600);
  scanI2C();
  lcd.init();
  lcd.backlight();
  if (!rtc.begin()) {
    Serial.println("RTC not found!");
    while (1); }
  if (rtc.lostPower()) rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
}
void loop() {
  DateTime now = rtc.now(); lcd.setCursor(0, 0);
  print2dLCD(now.day()); lcd.print("/");
  print2dLCD(now.month()); lcd.print("/");
  lcd.print(now.year()); lcd.setCursor(0, 1);
  print2dLCD(now.hour()); lcd.print(":");
  print2dLCD(now.minute()); lcd.print(":");
  print2dLCD(now.second()); Serial.print("Tanggal: ");
  print2dSerial(now.day()); Serial.print("/");
  print2dSerial(now.month()); Serial.print("/");
  Serial.print(now.year()); Serial.print("  Waktu: ");
  print2dSerial(now.hour()); Serial.print(":");
  print2dSerial(now.minute()); Serial.print(":");
  print2dSerial(now.second()); Serial.println();
  delay(1000);
}