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Project Notes


Prints the system time synced from the RTC to the serial output


This is the most basic test an DS3231 RTC used to sync the Arduino system time. During setup, the clock is set from the RTC (setSyncProvider(RTC.get);). The rest of the sketch is just a simpe routine to send the date/time to the serial port.

Since the RTC is only used during setup, the RTC clock can actually be powered down or disconnected once the sketch is running.

All the required libraries may be installed from the Arduino IDE “Manage Libraries” or installed separately.

The RTC module I’m using is based on the DS3231 chip. It uses I²C for communications (analog pins 4 and 5).

This sketch is only using the very basic DS1307-compatible time functions, but the DS3231 has some interesting extra functions to explore:

  • digital temperatur sensor
  • two time-of-day alarms
  • programmable square-wave output



The Schematic

The Build

Credits and References

About LEAP#166 RTCArduino
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This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is my personal collection of electronics projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

The projects are usually inspired by things found wild on the net, or ideas from the sources such as:

Feel free to borrow liberally, and if you spot any issues do let me know. See the individual projects for credits where due. There are even now a few projects contributed by others - send your own over in a pull request if you would also like to add to this collection.