Raspberry Pi as Wifi DMX controller

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doughadfield
Posts: 19
Joined: Mon Nov 06, 2017 4:40 pm
Real Name: Doug Hadfield

Raspberry Pi as Wifi DMX controller

Post by doughadfield » Sat Nov 11, 2017 3:06 am

I've been using the RPi version of QLCPLUS for a little while now, and it's so powerful it amazes me. The RPi (model 3, with built-in wifi) can be used as a passthrough wifi to DMX controller, but with QLCPLUS intellegence, so the workflow is as follows:
boot the Pi - it automatically comes up into wifi passthrough mode (input set to E1.31 on the wifi address, output set to UART). Run QLCPLUS on laptop, with output set to E1.31. Laptop qlcplus is now driving the lights through the Pi, which is acting as wifi to DMX interface.

Once the workspace has been configured and is working right, simply get onto the Pi web page from the laptop and download the workspace directly to the Pi. The whole show can now run natively from the Pi, and the laptop can be shut down and put away. the Pi web interface can be accessed from a tablet or phone, to operate the virtual console.

The above flexibility and functionality is truly amazing!! Especially for gigging bands like mine, where we don't have a dedicated lighting guy and laptops are cumbersome and risky to use on stage.

I'm an engineer by trade, so I made up a very cheap and easy uart to DMX adaptor, using an MC3487 chip (https://www.ti.com/lit/ds/symlink/mc3487.pdf) which cost less than £1 and can drive four separate DMX links from the Pi (single universe, but four cable daisy-chains). There are no components to worry about other than simply the chip itself (and perhaps a decoupling capacitor across the power pins) so it is incredibly simple and cheap to get going! If anyone is interested, let me know and I'll draw out the circuit for you. I built mine without even the need for a circuit board, just soldering directly to the chip pins, so the entire interface is actually built into the cable.

What an amazing product this is!! :-)

Doug

doughadfield
Posts: 19
Joined: Mon Nov 06, 2017 4:40 pm
Real Name: Doug Hadfield

Re: Raspberry Pi as Wifi DMX controller

Post by doughadfield » Fri Nov 17, 2017 1:50 am

Hi again, I also posted this in the RPi section of the forum, where I also posted a description and circuit diagram of the MC3487 based interface.

Check it out ;-)

Doug

siegmund
Posts: 552
Joined: Mon Nov 02, 2015 11:03 am
Location: Germany
Real Name: Lukas

Re: Raspberry Pi as Wifi DMX controller

Post by siegmund » Sat Nov 18, 2017 10:24 am

For the record: Here is a direct link to the other post (:

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