First step was easy - mount matrix on Rainbowduino, apply power, look at colourful display, smile.
Now, nothing works. I built the example code, used a usbtiny programmer to write the CMD v2.0 to the Rainbowduino, built the Seeedmaster code, downloaded it to a 2009 and connected them. Applied power to both - black matrix
Is there a way to test this? Or a minimum piece of code running on the Rainbowduino to show that the programming and leds are working?