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I am working on a tiny binary wristwatch. It is based on a 8 pins AVR, an RTC (to save power) and of course LEDs!

The main feature of this watch is its size as it is supposed to fit in a women wristwatch. This brings some interesting problems to be solved:

  • there is no room for a big battery, so it has to draw a few micro amperes,
  • there is only 8 pins on the microcontroller, but 10 LEDs to control.

Here is how it looks like:

electronic board
size comparison electronic
board preview

More posts to come with details.