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If you ever were stumped by multiplexing and charlieplexing, typically used with LED arrays and LED displays, the here is a good introduction and implementation of the concept. Especially cool is the illustration that demonstration the difference between the two. True to the adage of picture is worth thousand words, the illustrations explain at a glance the concepts that are outlined here Multiplexed Display and Charlieplexed Display.

BerryJam – Driving 4×7 LED with 4 resistors only kinda Charlieplexing.

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