Step 3: Circuit Design

There is nothing especially complicated about the device itself. Full schematic could be found here. Attached to the step is a simple diagram that explains basic components.

It was not trivial to put everything into a small box. Since I wanted to manufacture everything at home, multi-layered circuit design did not quite work. So, I had to fake a multi-layered board with an Arduino shield-like circuit. Blue lines on the attached schematics represents bottom layer, red lines are connections via shield headers.

I used photoresist method to etch the actual board. 

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