Real Time Clock and Temperature Monitor using DS3231 Module

Hi guys welcome to this tutorial. One of the most important thing everyone wants to keep track of daily is, time and with easy to use platforms like the arduino it is very easy to create your own timepiece and in the case of this tutorial add a temperature monitor to it.

Real Time Clock and Temperature Monitor using DS3231 Module

For this tutorial, we will be creating a real time clock and temperature monitor using the simple and easy to use DS3231 module.


The DS3231 is a very low power RTC chip, it has the ability to keep time with incredible accuracy such that even after power has been disconnected from your product, it can run for years on a connected coin cell battery. This module has the ability to communicate via I2C or SPI but for this tutorial we will be using the I2C mode for communications between our arduino and the DS3231. The module also comes with a quite accurate temperature sensor which we will be using to get temperature readings. The collected temperature and clock data is then displayed on the 16×2 LCD via the Arduino.

Required Components

The following components will be needed for this tutorial. They can be purchased via the links attached.

1. DS3231 module 
2. 16×2 LCD module or shield
3. Arduino Mega, or any other variation
4. Jumper wires
5. Potentiometer (if not using an LCD shield)
6. Small Breadboard 


Connect all components as shown in the Fritzing schematics below, kindly note the LCD connection will not be needed if using the shield.

Since the DS3231 is going to communicate via I2C then its I2C pins will be connected to the arduino’s I2C (SDA and SCL) pins which on the mega are located on pin A0 and A1 or pin 20 (SDA) and 21 (SCL) of the arduino mega.

RTC - Arduino MEGA
SDA - Pin 20(SDA)
SCL - Pin 21(SCL)
VCC - 5v

Next connection is between the LCD and the Arduino. If you are using the screen and keypad shield whose link is attached above, all you will just need to do is plug it in to your arduino as shown below.

Read more: Real Time Clock and Temperature Monitor using DS3231 Module

About The Author

Ibrar Ayyub

I am an experienced technical writer with a Master's degree in computer science from BZU Multan University. I have written for various industries, mainly home automation, and engineering. I have a clear and simple writing style and am skilled in using infographics and diagrams. I am a great researcher and is able to present information in a well-organized and logical manner.

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