deʃhipuI have four units assembled and ready to go. I might make one more from the parts I have left, but the button colors are wrong, so not sure.
I changed the way the display works. Pressing one of the three button no longer switches the display on -- there is a separate small button on the side that does it, and that also switches which counter is being displayed. I think that this is much more convenient, plus saves power.
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Smart use of the first digit!
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Initially I had lowercase "a", "b" and "c" letters in there, but lowercase "a" looks ugly on 7-segment display.
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