If i send 101 in theory nothing should happen. 100 should mean its the brightest. 0 is obv off. 255 means data start and 254 means reset the address.

That program isnt quite finished. The idea is that each chip picks up 16 bytes of data. 1 chip handles the first 8 and the other handles the second lot of 8. Resetting the address should only happen if a button is being held down when the command goes out.

Ive got the lights running a test pattern now so ill see if they break