Re: [uracoli-devel] New project: wireless DMX board

[Charles Goyard]

Hi Axel,

Axel Wachtler wrote:
> A full DMX stream contains a lot of redundancy, since the channels are
> most of the time rarely updated. So I came to the conclusion that
> just the gateway node, that is connected to the DMX master
> controller, needs to provide DMX compliant timing for the full data
> stream. That would be possible with an ATmega128RFA1, since it can
> run at 16 MHz, so the 250kbit/s should be manageable. However with
> 64 cycles between two bytes to send is a challenging realtime
> programming exercise.

Indeed it's tricky.

Now I recall I once opened a enttec USB dmx pro box, and it has two AVRs
inside. I guess the first does the timing stuff and sends the diff to
the second one, and the second just sends the dmx frames in loop.

The difference is also that the enttec box can receive act both as a
master or a slave.

Many thanks for your suggestions,

btw: tell me your postal address off-list and I send you a DMX projector
!

Cheers,

-- 
Charles