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the world of DMX for a newb..

September 16, 2011 | 2:23 am

Hello all,

Just wanting a little advice for a beginners DMX set up. I’ve been working with max/msp/jitter for a while now with audio and midi, and have had a few idea’s for projects that would require turning other items on or off via a computer/sequencer.

So I’ve researched my way into the world of DMX, and this is what I’m thinking of getting:

An enttec DMX USB Pro

And either:

a Elation Control DP-415 4-Channel DMX Dimmer

OR

a Chauvet DMX-4 Dimmer/Relay Pack

The idea being that I can control up to 4 different channel (not sure if this is correct terminology) of on/off information to devices that would usually plug straight into a wall outlet.

Granted, I’m in australia, so I have to get adapters to edison plugs, and make sure voltage and everything are ok. Speaking of which, the Chauvet has a step down transformer in it, so I’m leaning towards that at the moment.

Any comments welcomed! I don’t have any peers doing this sort of work with their art!

Many thanks! – ToddAK


September 16, 2011 | 11:29 am

The Enttec DMX unit is a good option, although you will need the following external to use it with Max.

http://www.nullmedium.de/dev/dmxusbpro/

A dimmer-pack allows you to vary the voltage of an electrical supply to dim a lighting fixture. Be warned however that you can’t plug just anything into a dimmer. Anything with complex electronics, or indeed anything more complicated than a simple bulb is it risk of being damaged if supplied by a dimmer. This is because dimmers do not produce a smooth sine wave of AC voltage, there are numerous spikes and harmonics in the supply.

On the software side of things, take a look at the following link. The manual also has a lot of advice for using DMX rigs.

http://www.theimpersonalstereo.com/software/imp-dmx/


September 16, 2011 | 1:49 pm

What exactly are you turning on/ off? If it's just DC powered stuff you could do it very cheaply with an Arduino (without having to code using Maxuino) and a very simple circuit that uses a transistor as a switch. I'm sure theres something you could do with AC stuff but I wouldn't mess with it!

Attached circuit, just replace solenoid with your DC item, power with your required power source and PIC output would be a pin from the Arduino.

[attachment=170981,2631]

Attachments:
  1. transistorsolenoid.png

September 19, 2011 | 6:22 am

Actually, I’m needing to turn fluro lighting tubes on and off, its for a performance based piece.

I saw ‘dimmer’ on this model and assumed I could use it to send on/off signals to electrical appliances (like lights or stereo’s, for example), OR then if I had lights only, I could use a dimmer switch.

Is this right? Like I said, still learning :)

I have never played with anything arduino related, so its like looking down another wormhole at the moment. I would like to stay based in the max/msp world if possible, as my projects tend to build on each other over time. But the idea of a ‘maxuino’ sounds a little more tempting. But I’m still not sure of the advantages of doing so. Is it just the fact that you can run it off relatively cheap hardware as opposed to a computer set up?


September 19, 2011 | 8:22 am

Sounds like you want to go with a DMX dimmer/relay pack. For tubes you want to use the relay switching mode, NOT the dimmer mode (as far as I know). The Chauvet pack you linked enables you to set some channels to relay mode and some to dimmer mode which is nice and adaptable, whereas the Elation one looks like you can only set the whole pack as dimmer or relay mode.

Arduino combined with Max and Maxuino enables you to do a lot of hardware interfacing without having to get out of your Max comfort zone, but in this case you’d either be playing with high voltage AC which is dangerous and not recommended, or I suppose you may be able to find an off the shelf inverter to convert a low voltage DC power source into AC which could be tacked on to the circuit I attached. I don’t know enough about that to advise you really.


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