work I started by making printed circuit boards using the thermal transfer method, but this was not without problems because the printer did not want to accept coated paper.
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Next, all milling I make using hand dril. In final version I plane to use two layers PCB but in prototype - all additional connection using wires and capton tape.
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Finally assembled prototype have thickness 4mm determined by coin cell. In next generation I plane to use liion 2,4mm.
Current consumption oscillate about 3mA width running CPU and 87uA for power down and running LCD.
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