Anton Poluektov- The case is relatively thick (12.5mm total thickness). This is limited by the chosen CR2032 battery holder which is itself 5.5mm thick, and of course it should be placed on the back of the PCB, so one should add the thickness of LCD/switches to this value. A better solution would be to make the cutout in the PCB for the battery and find a thinner holder, but I failed so far to find the good one. Alternatively, I could use two smaller 1.5V batteries placed on the front side of the PCB. To be investigated for the next iteration of PCB.
Issues with PCB and enclosure design
A project log for OpenRPNCalc
Open-source and open-hardware custom scientific RPN calculator
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