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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.

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.

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.