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I found these cute little retro 4 digit LED displays for less than $1 each so I just had to design a larger serially controlled display.
ino - 3.39 kB - 11/15/2019 at 13:29
sch - 427.97 kB - 11/15/2019 at 13:29
x-zip-compressed - 176.02 kB - 11/15/2019 at 13:29
brd - 114.58 kB - 11/15/2019 at 13:29