I wanted to play with the new ATtiny424 which happens to have a built in 32768hz oscillator. So decided to build a binary kitchen timer. I have some mini Christmas tree's (made with attiny10) and thought a building would go good with it.

The schematics and code is here:

https://www.shermluge.com/electronics/attiny424/attiny424-binary-kitchen-timer-internal-clock

Enjoy

Other creations:
https://www.thingiverse.com/shermluge/designs