The year is drawing to a close, and we have a project for you to while away the remaining hours. Take the Coin Cell Challenge!

The point of the is to do something interesting with a cell. That’s it! It’s a challenge that can be as simple or as involved as you want. Low power is where it’s at these days, so if you’ve never used the hardware sleep modes in your favorite microcontroller, that would make an excellent challenge entry. us what you’re able to do with short wake periods, and talk about when and why that wake happens. Or go a completely different route and build your own cell!

[Ben Krasnow] makes the most of a tiny power source

The twenty entries will each receive a $100 Tindie credit so they can score some excellent gear. Three top winners in some special areas who will each be awarded a $00 cash prize. We’re looking for something interesting that demonstrates longest life (Lifetime Award), something that burns through that coin cell as if it’s going out of style (Supernova Award), and something that fills us with disbelief (Heavy Lifting Award) because it shouldn’t be possible with “just a coin cell”.

One of our biggest inspirations for this contest was [Ben Krasnow] who managed to squeeze enough juice out of a miniscule coin cell to power his Flashing Light Prize entry, only because he reduced internal resistance by heating the cell with an air gun (here’s the Hackaday coverage of that project). And [Elliot Williams] wrote a great guide on what kind of juice you can expect to get out of a cell. Take these to heart and do something interesting this weekend. Enter now!

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