After looking into that I still wasn't getting any good results, so I went over to my circuit and looked if all was well connected: No! I incidentally connected the ground of the arduino to the wrong strip on my breadboard (really stupid little mistake), so there was no reference for the dmx >> not working.
When that was fixed, I got it working (HOURAY!) with the fading up and down script in combination with the old 0005 software!. I edited it so it now responds to the serial data coming from maxmsp, giving me a nice rgb colour mixer.
I agree with you on the showtec quality though. Some downsides:
- weird bug: sending a value of 127 on any rgb channel makes all leds flicker in a cray manner. (128 works fine)
- not all leds are perfectly aimed (the red ones have a bigger angle), so not all colours mix well (yellow in particular is really bad: a green center with a red halo). A solution for this would probably be some sort of lens that I can place in front of the par?
Thing is, I really need 6 of these working together for an exhibition, and there is virtually no budget, so I'm bound to these units. (rgb and not producing any heat > perfect)
Besides it all working now, I am still really curious what the _SFR codes mean, and the asm() in the 0008 script (from szakal & papp). Does anyone know?