Tobias Hocke has built a cool binary clock that is based around the ATmega8515 microcontroller. Slap in a 9 volt battery and push a few buttons to set the time and you have a clock that very few people can read. Check out his site for a full schematic so you can build your own.
ATmega8515 Binary Clock
![](http://dev.hackedgadgets.com/wp-content/2/_binary_clock.jpg)
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