I just got the whole Atomo line final prototypes back and we kicked the tires to make sure they were at least functional. I needed something to really test the concept of the design approach for the system, so I picked up 40m of RGB LEDs in Shenzhen and proceeded to put something together.
So, I started with building a single module to drive as many LEDs as I could from one card. The limitation was that I wanted to do a non-matrixed display, so 1:1 drive for each IO control signal. I've got up to 8A of power for each module to work with, and I had 6 pins of GPIO that could drive, so we are looking at a max of 12V (the limit for the LEDs I had) and about 1.3A per each channel. The first test module allowed for way more than that, and then I designed a PCB version with slightly smaller FETs that will only handle up to around 4A each.