void loop() {
    DateTime now = RTC.now();
    lcd.clear();
    lcd.print(now.hour(), DEC);
    lcd.print(':');
    lcd.print(now.minute(), DEC);
    lcd.print(':');
    int seconds = now.second();
    if (seconds < 10)
      lcd.print("0");
    lcd.print(seconds, DEC);
    delay(3000);
}