The circuit for this project requires a few soldered connections. Follow the diagram below to see how the circuit is constructed.

This circuit includes an optional switch that will allow the user to toggle the clock daylight savings time (+ one hour). 

Start building this circuit by connecting the power and GND lines to the terminal blocks on the DC power adapter.

Solder Time

The Feather needs Female headers soldered on. Solder male headers (included with the 'Wing) onto the RTC FeatherWing.

Solder the jumper cables from the terminal block to the Feather M4 and Featherwing.

Plug RTC FeatherWing into Feather M4 Express.

Flexible Power Source

This circuit arrangement will allow you to conveniently power your clock via a micro USB cable or a 5V DC power supply interchangeably.

The small coin cell battery in the RTC FeatherWing will keep time for you even if the clock is unplugged, so you never have to worry about setting the time.

Daylight Savings Time

To account for the spring forward and fall back cycle we go through every 6 months, a small switch can be added to the circuit to allow the user to toggle the time forward an hour and back when needed.

Toggle Switch

Bend the legs of the slide switch 90 degrees.


Solder one wire from the middle leg of the switch to the GND line.


Connect the left leg of the switch to pin #6 on the RTC FeatherWing.

Now, flipping this switch to the left will activate Daylight Savings mode, adjusting the clock one hour forward. 

This guide was first published on Jul 12, 2019. It was last updated on Mar 01, 2024.

This page (Circuit Diagram) was last updated on Jul 08, 2019.

Text editor powered by tinymce.