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Lesson 99: Real-Time Cloick DS3231 to build LCD and LED Clock

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Part 13: Clock and Timers

This code (99-1) is part of a lesson on using DS3231 Real-Time Clock module with Arduino.Please watch video for full details.

 * Lesson 99: LCD Clock using Arudino and DS3231 RTC module
 * Full video details:
 * In this lesson we have the following codes:
 * 1-Basic DS3231 to display on serial monitor
 * 2-Using Larm feature of the DS3231
 * 3-LCD Clock
 * 4-4 Digit LED Clock
 * 5-Unlimited Alarms using DS3231 with reset push button
 * This code is part of Arduino Step by Step Course which starts here:
 * for library of this code visit
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 * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
 * This code has been download from
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <>.

  DS3231: Real-Time Clock. Simple example
  Read more:
  (c) 2014 by Korneliusz Jarzebski

#include <Wire.h>
#include <DS3231.h>

DS3231 clock;
RTCDateTime dt;

void setup()

  // Initialize DS3231
  Serial.println("Initialize DS3231");;

  // Set sketch compiling time
  clock.setDateTime(__DATE__, __TIME__);

void loop()
  dt = clock.getDateTime();

  // For leading zero look to DS3231_dateformat example

  Serial.print("Raw data: ");
  Serial.print(dt.year);   Serial.print("-");
  Serial.print(dt.month);  Serial.print("-");
  Serial.print(;    Serial.print(" ");
  Serial.print(dt.hour);   Serial.print(":");
  Serial.print(dt.minute); Serial.print(":");
  Serial.print(dt.second); Serial.println("");


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