Have an Arduino or two laying around so figured I might as well give it a go there too. Pin headers I used work perfect with both rPi and Ard.
Going to work on a 3D printed holder/diffuser. Square black holes with drop in clear diffuser blocks. Should give it a more pixely look rather than the narrow streaks when painting/pov. Make it less dottie!
Adafruit Metro Mini Arduino running Adafruit DotStar library demo
Adafruit 60 pixel DotStar strip connected VIA SPI bus
ReadymadeRC 5V 5A UBEC to power it all and make it easy to power via various power sources.
There are some newer Arduinos that are clocked at 64 Mhz. Will have to see if the SPI bus will scale to 32Mhz or higher. The Uno/mini is only clocked at 16 Mhz, and the SPI bus is limited to 8mhz (1/2 clock)
Cheers!
LitterBug