DerKnopf LED ring

by hzeller.
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2 layer board of 1.19x1.26 inches (30.20x32.00 mm).
Shared on November 6th, 2016 21:32.

IR receiver and charlieplexed LED ring around volume control. Used in https://github.com/hzeller/DerKnopf but can be useful for other things as well. 6-wire charlieplexing for 30 LEDs, lined up exactly with 1/32 turn for 32-detent encoder; two spacing.

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