DS3231 Time Set Arduino Real Time Clock With Serial Monitor Easily

I will make a project on DS3231 Time Set Arduino Real Time Clock With Serial Monitor.

The DS3231 is a very accurate & widely used Real-Time Clock (RTC) module. This module is used in Arduino based projects. This module also works with Raspberry Pi. So let’s start DS3231 Time Set Arduino Real Time Clock With Serial Monitor.

ds3231 rtc module with cr2032 coin battery

Before connecting DS3231 with Arduino, make sure you have inserted CR2032 battery into DS3231. It is recommended to use Rechargeable cell. But you can also use non rechargeable cell.

Components Used:(Click to Buy)

Library of DS3231 Time Set Arduino

Now open your Arduino IDE and go to the Library manager from the menu bar.
Now search for RTCLib and select the latest version to download. This library is provided by Adafruit as you see in the image below.

rtclib for ds3231 by adafruit in arduino ino

Connect DS3231 with Arduino UNO

After adding the library we have to connect DS3231 with Arduino UNO. Connection is very simple as you can see the diagram below.

DS3231 Time Set Arduino

If you face any issue after a connection in the above diagram, then reconnect SCL and SDA to A5 and A4.

Clock with Temperature using DS3231 & SSD1306 in Arduino

DS3231 Time Set Arduino using program

After all the connection done we have to write a simple code to update the current into the DS3231 module.

Remember only write time once after installing the CR2032 coin battery. As long as there is power in the battery, you will not get any error in the time.

You can use the following code to update the time.

ds3231 rtc module with cr2032 coin battery

Code Explain of DS3231 Time Set Arduino

The code is a very simple one. It will set the time & then display the time in the serial monitor from DS3231.


In line 18, rtc object is setting the time according to your computer time. It will set the present clock time of your system.

rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));

In line 19, you can set the time manually just sending the date time value to the function in the order of year, month, date, hour, min, second.
In the following code, we are setting time if system. So we commented the line 19.

Arduino Sketch of DS3231 Time Set Arduino

Output of DS3231 Time Set Arduino

After opening the serial monitor in 9600 baud rate you can see the following output i.e. Time fetched from DS3231.

DS3231 Time Set Arduino

Share with Friends
5 1 vote
Inline Feedbacks
View all comments