Rainbowduino 3.0b driver from Seeeeduino with 8×8 LED Matrix
The b is an ATmega328 so make sure you select the right board. Selecting the wrong board (ATmega168 for example) will cause a failure to upload. If you aren’t sure if avrdude is actually sending packets, go to Arduino: Preferences and check Verbose error reporting. Then you’ll get the full picture.
Their instructions say put the LED matrix with the print side over the “Green Drive Green” side of the Rainbowduino (looking at it from below). However, this failed to function. Either ours is backward, or the instruction is wrong. Either way, we have our print side aligned to the Blue Red side and now it works!