Simple 4 channel DMX controller

[bcd]

Very nice.

One thing to be aware of is the DMX spec says there must be a minimum of 24 channels in a DMX message, so some cheaper devices might not be able to receive the dmx channels correctly.

One option is to send out 20 '0's at the end of the HSEROUT statement.

bill

[skimask]

Very nice.
bill

So, if I understand your comment correctly, this simple implementation really works (aside from the 24 channel minimum that you mentioned) ?

I don't know how DMX works, don't know the actual protocol, never used it, never had a need to use it (can't be too crazy hard as long as a guy reads the protocol documentation thoroughly).
BUT, every once in awhile, about once or twice a year, usually before Christmas, a few new folks log on here, and make a big to-do out of this, that, and the other thing, and can't get a DMX controller to work.
I guess I'm just wondering what the big deal was...after all, if code above works, well, jeeze, that's not so tough...

[Darrel Taylor]

I guess I'm just wondering what the big deal was...

This is the Transmit end of the DMX system.

The "big deal" comes on the Receiving end.
It's struggling to PWM some large number of channels at the same time it's receiving the DMX data at 250Kbaud.

Seems to be a favorite "First Time" project.


eggman,

Short, sweet, and to the point.
Very nice indeed.

[skimask]

This is the Transmit end of the DMX system.
The "big deal" comes on the Receiving end.
It's struggling to Dim some large number of channels at the same time it's receiving the DMX data at 250Kbaud.
Seems to be a favorite "First Time" project.

I suppose it would be a struggle, for the noob, trying to keep the RCREG from overflowing, while performing other tasks.
At any rate, I'm bookmarking it. It may 'only' be the TX end, but reverse engineering some useful RX code doesn't look too difficult.

[charudatt]

This thread code looks goofed up any chances of including a txt file for the benefit of others.

Thanks.

[mackrackit]

Check it now.

[charudatt]

Thanks DAVE.