While waiting for the PCBs to arrive I have been refining the firmware more. It is now possible to set the Hue, Saturation and Brightness separately in single byte commands. The 3 byte RGB command has been augmented with additional commands to set each colour separately.

There is also now an 8-bit RGB command which enables selection of 255 colours from a single byte (well 255 colours plus black). It uses the format BBGGGRRR. So red and green both have 8 possible combinations and blue has 4 giving the full 256 options. Below is the new command set and what colours are available with the 8-bit palette (please note the colours on screen WILL display differently compared to the LED output!)

Here is a quick video of my test unit randomly selecting palette colours: