Just wanted to record this little "practice project", in case I need to refer back to it, or its useful to someone else. Normally, 12 outputs from an Arduino would be needed to drive a 4 digit 7-segment display. 4 outputs for the common connection of each digit, plus 8 outputs for the segments. Th…

Useful circuit: Charlieplexed 4 x 7-Segment display

PaulRB September 15, 2013, 2:56pm 3

Schematic.

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