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DMX library not working with custom pins ESP-C3 #5530
Description
What happened?
When compiling from source and redefining the hard-coded dmx output pin as mentioned in [https://kno.wled.ge/interfaces/dmx-output/](the wiki), the changed pins won't show up in WLEDs new pin overview. Also, no DMX signal is being produced. Only a constant PWM signal can be observed on the GPIO
To Reproduce Bug
- Compile WLED from source
- Enable DMX Output in
wled00/wled.h - Set the DMX Output pin to
5insrc/dependencies/dmx/ESPDMX.cpp - Observe the GPIO with an oscilloscope
- Observe GPIO 2 still occupied by DMX in the pin overview on ESP32
- No DMX output on GPIO 2 as well
Expected Behavior
- Selected Pin 5 marked as used for DMX
- DMX signal on pin 5
Install Method
Self-Compiled
What version of WLED?
2602141 / v0.15.4 / installed via git clone https://github.com/Aircoookie/WLED.git
Which microcontroller/board are you seeing the problem on?
ESP32-C3
Relevant log/trace output
Anything else?
No response
Code of Conduct
- I agree to follow this project's Code of Conduct
Activity
DedeHai commentedon Apr 23, 2026
Just FYI: for a pin to show in the pin info it must be registered through the pin manager.
netmindz commentedon Apr 24, 2026
Is being looked at as part of #5216
Mdbelen commentedon Apr 28, 2026
Alternatively, if you like you could also test the branch in #5522 and compile with options
-D WLED_ENABLE_DMX -D DMX_TXPIN_DEFAULT=5Would be a charm if you reported your results there.
nmeurer commentedon Apr 29, 2026
I just compiled #5522 and confirm that it is indeed working. DMX output is there (tested with 3 channels) and pin 5 shows being used in pin overview.
This would solve both my issues I'm having
github-actions commentedon Aug 28, 2026
Hey! This issue has been open for quite some time without any new comments now. It will be closed automatically in a week if no further activity occurs.
Thank you for using WLED! ✨