Arduino RDM Relay

by DavidB56

6.0K2111

Intro: Arduino RDM Relay

So far I have been using DMX but that meant I would have to reprogram my arduino every time I want to change the DMX start address so I decided to switch to RDM.

STEP 1: Gather the Parts

  • MAX485 (RS485 tranciever)
  • Female and male xlr's
  • Arduino uno rev3
  • Relay of your choice
  • N-channel mosfet
  • led
  • 4.7k Ω resistor
  • 220 Ω resistor
  • Breadboard or pcb
  • Jumper wires
  • DMX/RDM tester
  • 12 volt power supply

STEP 2: Build the Circuit

STEP 3: Arduino Code

  • install the DMXSerial2 library using the library manager
  • upload the code

STEP 4: Test the Device

For testing this device you will need an RDM tester or controller

  • plug your RDM relay into your RDM tester or controller
  • power them both up and then you can check if the device is listed in your RDM tester or controllers device list

8 Comments

KevinV13 1 year ago

Hello, I did try the code you made. And I upload it succes. But when I try to read the RDM. I don’t get a RDM fixture in my Dmx cat. Is there sometime special to change. The only thing that is different from your is that I use a SN75176BP, and not a MAX485. Do you that that is the problem ?
And I also use a, old arduino uno. The one with a USB B connector on it.

I hope you can help me.
Kind regard,
Kevin

helderazi 4 years ago

Nice work!!
Unfortunately not to upload the sketch... Did you have to do anything special to upload it?

DavidB56 3 years ago

You may have to disconnect the rx/tx lines form the arduino while uploading

rlasure 3 years ago

Cool! Nice project. How hard would it be to add three more relays?

DavidB56 3 years ago

It wouldn’t be difficult all you’d have to do is slightly alter the code and hardware

Saitejac 5 years ago

Did you test this by connecting DMXCat?

DavidB56 5 years ago

For testing i used an Enttec usb interface, my own diy DMX/RDM-usb interface and an old DMX/RDM tester

MoreRickless 6 years ago

I've been building electronic projects (for fun) for 53 years & I still have no idea what RDM or DMX means. Please remember that this forum is for those who don't know as much as the writer about the subject at hand - or what's the point? My search on the net for definitions comes up with a dozen so far, none of which have anything to do with this project.