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Thread: Connect USB-RS485/DMX adapter to Pixels!

  1. #1
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    Default Connect USB-RS485/DMX adapter to Pixels!

    The engineers were screwing around last week and decided to see what might happen if they connected DIGWDF's USB-RS485/DMX adapter to a strip of WS2811 12volt pixels. So they tried this...

    ** Adapter power ground and pixel strip ground to the power supply's ground
    ** Adapter power +V and pixel strip +V to the 12vdc power supply's +V.
    ** Adapter D+ output to the pixel strip's data input line.
    ** ESP module loaded with the pixel version of Shelby's ESPixelStick firmware

    esp-rs485-pixels.jpg

    SHAZAM, CAPTAIN MARVEL!!! As it turns out, this little gizmo is like a magical, universal adapter -- it works like a charm!!! It works by using the adapter's 75176 chip as a voltage level shifter from the ESP's 3.3v output to a more normal 5vdc with good, strong current to put plenty of signal down the data wire. Only the D+ output from the 75176 chip is used; the D- is unconnected. Of course, the voltage that powers the adapter must be the same as the voltage needed for the pixels, but that's no biggie....

    So now, for peanuts you can pick up a kit with all thru-hole parts and connect it to a Renard controller, any DMX controller, a LOR controller or even directly to pixels!
    Last edited by dirknerkle; 05-06-2018 at 07:19 PM.

    http://digwdf.com/store/
    The store were you can find blinky-flashy gizmos that you never knew existed!

  2. #2
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    Default Re: Connect USB-RS485/DMX adapter to Pixels!

    Just to be clear, you are using DMX capable hardware, but the software is NOT outputting DMX on the tx line. It is outputting a pixel data stream through the DMX compliant hardware.

    There is no USB here and this trick only works on the ESP based adapter. Still a great adaptation.


    2018 - Moving and going to visit my Daughter in New Zealand. Most likely I will be dark or nearly dark, Some static stuff that is simple to put up.

  3. #3
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    Default Re: Connect USB-RS485/DMX adapter to Pixels!

    Correct. Since the adapter is ESP-based only, only the pixel version of ESPixelStick firmware, which outputs a signal designed for pixels, will work. Outputting DMX or Renard, for example, to a pixel string or strip will not work with pixels, but they will work for a DMX or Renard controller respectfully.
    Last edited by dirknerkle; 05-06-2018 at 07:21 PM.

    http://digwdf.com/store/
    The store were you can find blinky-flashy gizmos that you never knew existed!

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