Just started my new DMD. This will be a 128×32 RGB DMD with a 4mm pitch. Total display size will be around 5″x20″ so it is almost twice as large as a normal DMD but it will be in color. I ordered a single 32×32 matrix (seen above) and took some sample code from adafruit’s website to get it working.
Since the proof of concept is working I will expand it to the 128×32 by adding 3 more modules and running the display off of a Ti Stellaris LaunchPad. The Stellaris LaunchPad runs at 80Mhz so it will be plenty fast enough to do the matrixing. It will have an onboard SD Card so it can pull the images off of it. The main controller of the pinball machine will use an I2C bus to tell the LaunchPad which image to display.