Shut down Neopixels on external MCU when main MCU is powered off

General Discussion
1

Hi!

I am currently running a modified Sovol SV06, with X, Y and dual Z on the main board.
Extruder stepper is running on a secondary Raspberry Pi Pico and so is two strings of NeoPixels.

Is there a way to make the secondary MCU shut down the NeoPixels when it is detected that the main MCU goes down when I flip the switch to the PSU?

Since this is more of a general question than a configuration specific question I didn´t post my Klippy.log.

2

You’re not powering both by the same PSU? Why would you want power to that secondary pico when the main board is offline?

3

Sorry, I knew that I probably left som information out

  1. The Neopixels are powered by a separate 5V wall plug
  2. The Pico is powered by the RPi 3B+ that runs Klippy.

The easy way to solve this would probably be to add a relay that is controlled by the 24V from the PSU to cut the 5V from the Wall plug but that was not my question :slight_smile:

4

See Configuration - Moonraker
You can control GPIOs, external relays etc with Moonraker.

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5

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