Hackaday 555 Timer Contest:

Join Hackaday and Digi-Key for the return of the 555 Timer Contest! We loved seeing the creativity of all the entries in this contest a decade ago. 2021 marks the fiftieth anniversary of the 555 timer design, and building something cool around the 555 is a perfect way to celebrate.

Design something cool that uses the 555 timer chip or one of its variants (556, 558, low power versions, etc.), or even build your own 555 from discrete components. If it has the classic 555 circuit as a central part of the design, it's fair game.

You're not limited only using 555s, but the timer chip should be central to the circuit. In other words, we don't want to see a design where the 555 just plays an ancillary role. The timer chip should be the point of the design.

Hackaday and Digi-Key have partnered on this contest to offer three winners an online shopping spree to the Digi-Key warehouse!



Thanks to our partner Digi-Key, three top projects will be awarded a $150 shopping spree to Digi-Key.


Judges will be on the look out for entries that are worth special recognition in the following special categories.


Need some inspiration? Here are some projects to check out that should get your ideas flowing:

How to Enter

Start a new project on Hackaday.io. Share images of your project and tell the story of how you designed and built it in the description of your project.

Once you have published your project, look in the right sidebar for the "Submit project to..." menu to enter it in 555 Timer Contest:

Judging Criteria

Here are some criteria judges will have in mind while reviewing entries:

555 Timer Contest Rules

Important Reminder: Previously created projects may be submitted to the contest, but they must be updated within the timeframe of this contest. Previously created projects submitted with no updates will be disqualified

To get started, start a project on hackaday.io and upload your project.

A big thanks to Joe Kim for the amazing art!