How to invert filament sensor?

Fuganater

Hello!

I have a Duet 2 Wifi running 2.05 FW. I'm trying to add a filament sensor and while it works, it is working inverted. I can't for the life of me figure how how to invert the sensor.

I'm using this sensor: https://www.amazon.com/TriangleLab-Filament-Runout-Detector-Printer/dp/B07DHD8WHF

I also tried just a standard endsotp switch and I get the same results.

Here is what is in my config.g
; Filament sensor
M591 D0 P1 C3 S1 ; Set Filament sensor Simple type (High) for extruder drive 0, connected to endstop input 3 (E0)

Please let me know if there is a simple fix for this. I've tried:

P1 and P2
S1 and S0
Inverting the ground and sensor pin. Doesn't work as the board doesn't full boot due to a short.
Tried multiple switches.

Thanks so much for the help!

Fuganater

Well I solved this because I didn't understand RRF. (I've literally been at this for nearly a week)

I was looking under "Machine Properties" and was going by that. I expected the signaling to change there but that is not the case.

I had to just send M591 D0 to get what the ACTUAL status of the filament sensor was.

With P1, it was wrong. With P2, it inverted it and triggered when filament was not present.

Hopefully this helps another noob like me out.

fcwilt

Hi,

Glad to hear you got it sorted.

Good job.

Frederick