Duet 3 Toolboard 1LC - IO0 input/output dual purpose (Neopixel)

[RogerPodacter]

I have my Inductive Z probe connected to IO0 on the toolboard, using only 3 pins: 5V, GND, IO0.in. Could i use the last pin IO0.out and connect it to a NeoPixel, using it for completely different device function? I assume i would just define the pin in config.g like normal?

Could i also daisy chain the GND and 5V for the NeoPixel? Note i am only connecting a single NeoPixel which uses 60 mA of current.

[gloomyandy]

@rogerpodacter The current toolboard firmware does not support Neopixels.

[RogerPodacter]

@gloomyandy ok thanks. so my option is to go to the mainboard of the Duet 3 Mini 5+. i see the dedicated LED pins need an external 5V power supply. couldnt i use a regular IO such as IO2.out or IO3.out since i'm only powering 2-3 individual NeoPixels? it has 5V power.

My current setup is using a PanelDue 5i 4-wire, a Y endstop, and 2 thermistors. then everything else goes thru the toolboard 1LC. the documentation says 5V supplies 1A total, 200-300 mA for internal, then PanelDue and other peripherals. All i have

[dc42]

@rogerpodacter we're looking at supporting LED strips on some expansion boards in firmware 3.5. On the tool board, the most suitable pins for supporting LED strips would be IO0.out (but that would mean that you couldn't use a BLTouch) or the PA23 test pad near the corner of the version 1.2 and 1.3 tool boards.

The tool board uses a linear regulator to drop the 12V supply to 5V. If you ran a single Neopixel LED at the maximum 60mA, this would increase power dissipation in the regulator by (60 * (12 - 5)) = 420mW.

[RogerPodacter]

@dc42 sounds like its better to just go directly wired to the mainboard even for 2 LED's which i am using to illuminate my nozzle. I'm good with that, thx!

[R4ffers]

@rogerpodacter that's what I did.

[dc42]

@r4ffers the alternative when we support Neopixels connected to the tool board would be to use a buck converter on the tool board powered from VIN.

We may replace the linear regulator on the tool board by a buck regulator in a future version, to allow for powering a few Neopixels.

[R4ffers]

@dc42 that sounds excellent

[T3P3Tony]

To confirm this is logged as a feature request for a future firmware version:
https://github.com/Duet3D/RepRapFirmware/issues/782

T3P3 created this issue 24 Apr 2023, 19:55 in Duet3D/RepRapFirmware

closed Neopixel support on TOOL1LC #782

[dc42]

This has been implemented in firmware 3.5.