Charlieplexed Arduino 8×8 LED Grid Display Shield made and simulated in 123D Circuits

edit: Wow, this won an awesome prize! Very many thanks guys! Charlieplexing ( is a powerful method for driving a large number of LEDs from a relatively small amount of IO pin and without using any extra components. The technique makes use of the fact that a LED will only let current through in one direction. So if you con ...

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