This site includes the board layout and code to make this ATmega128 powered LED sign. If you speak German here is the original German site.

“Again such a crazy project of me. It began with the fact that I with EBay a mountain LED of modules ersteigert. And from this this enormous LED became panel. Whom is too enormous, there is also a small brother.

Here times the technical data:

* 128×64 two-colored LEDs
* approx. 80x40cm largely
* Power input computationally max. 110A/5V = 550W
* Ethernet interface
* Processor ATmega128 with 16MHz ”


Via: Make