Scalable-RGB-LED-Matrix

Watch a 4x6 - Matrix on YouTube:
http://www.youtube.com/watch?v=DeNzGhN-fe8

This thing is a LED-Matrix ... the Cubes are 8cm x 8cm x 3cm .. the Chip for controlling the LED's is a WS2803 (get them at ebay) .. a WS2803 is a constant-current-led-driver with 18 channels .. meaning with 1 chip you can control 18 leds or 6 rgb leds.
Please note a RGB-LED is having different voltages per color ... but the same current ;-) .. so a constant current driver will ensure the voltages are automatically set by the chip .. you dont have to care about that.

Okay .. this tiny Chips are SPI-Controller ... so they have a Input-CLOCK-Pin and Input-DATA -Pin ... AND best of all ;-) Clock-Out-Pin and Data-Out-Pin .. so you can chain this chip with 2 wires :-)

e.g. for the 15 x 6 RGB-LED-Matrix i'am building .. a build 6 Cube-Columns ... every column is powered by one WS2803 Chip which is connected to the next column .. its quite easy to build a giant LED-Matrix with this driver .. please notice .