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 (http://wealoneonearth.blogspot.nl/2013/03/design-note-charlieplexing-led-matrices.html) 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 […]