This article starts out with basic LED arrays and controlling them with an Arduino. Then it gets into the more complex stuff, like controlling the array with a computer. Finally, he explains how to use a web-cam and Processing to convert the video signal into an 8X8 LED matrix. All the source code and schematics are available to download on the site.
The final one is a question from Ray. The Processing program takes input from a webcam through the use of JMyron. The camera image is down-sampled to 8×8 with black and white information only. Each 8×8 frame is sent to the Arduino board to display in the LED panel. The image hardly resembles the original but in itself looks quite nice.
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