We need to document this more. I start by putting here the sources of the modified firmware: 40h-intensity.tgz. Demos are visibles here: http://www.vimeo.com/761495.
Quick instructions to use this firmware:
You need a programmer to upload the firmware
You need serial-pyio which has some niceties to make the modified firmware compatible with regular applications. Download the source from the svn repository, or wait for the next release…
You can now send new led messages : /40h/led [x] [y] [intensity], with intensity going from 0 to 15.