[__jonas]

Newer said it was a hard problem in general, it's hard for me with my limited familiarity with electronics, that's why I was curious how it was done here.

I recall the last time I wanted to do this, my problem with it was that my microcontroller had a different voltage requirement than the LEDs and I tried to put together a little circuit that delivered the right voltage to the microcontroller and LED matrix from a single 5V power supply. I think it worked kind of ok and then not anymore and I had trouble figuring out where I went wrong, most likely did some bad soldering somewhere.