Filament Sensor

davidewen

Help needed coding a filament run-out sensor.

The documentation I've been able to find is not very user friendly.
https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_filament-out_sensors

My sensor is a 3-wire V G S switch.
I have it wired to io_0, but I can not figure out how to program it so it works.
I discovered there is also a "trigger" that needs to happen to pause the print and allow changing of the filament.

Any help is much appreciated.

Phaedrux

When kind if sensor is it exactly?
What Duet board are you using?
What firmware version?
How exactly have you wired it up so far?

davidewen

@phaedrux

Sensor: 3-wire mechanical switch. Like an end stop switch.
Board: Duet 3 Mini 5+ (Mini5plus)
Firmware: RepRapFirmware for Duet 3 Mini 5+ 3.3 (2021-06-15)
Wired: io_0 (5v to V), (Gnd to Gnd) (S to io0.in)

davidewen

@phaedrux

Sensor is the stock Ender 6 filament sensor

achrn

See https://duet3d.dozuki.com/Wiki/Gcode#Section_M591_RepRapFirmware_Num_3

I don't know anything about the Ender 6 filament sensor, but if it behaves like a real switch (i.e., return either low when filament present and high when absent, or vice versa) then you want something like this in config.g:

M591 D0 P2 C"io0.in" S1

That says extruder zero (D0), a sensor that is low when filament present (P2) on pin io0 (C"io0.in") and enabled (S1).

You don't need to also declare a trigger.

davidewen

@achrn
Thanks for the response.

Yes, this is a switch that pressed = filament, unpressed = no filament.

When I physically press and release the lever, the LED light shows up on the switch, but in Duet Web using M591 D0, I get the same status when the switch is in either state.
Here's my gcode: M591 D0 P1 C"io0.in" S1
I've also tried M591 D0 P2 C"io0.in" S1

So P1 or P2 gives me a response in console, but the state doesn't change when the switch does.

Here's a video showing the switch in both states and the LED on the switch lighting.
IMG_0107 (trimmed)-1.mp4

Here's the console response with the switch in both states.
console.txt

alankilian

@davidewen

On the io_0 connector, try jumpering io0.in to ground and run M591 D0
Then, jumper it to +5 Volts and run M591 D0 again.

Post the results.

If you see proper responses from M591 D0, they your sensor or wiring is not functioning.

If you do not see the proper results, then your configuration or your Duet board is not functioning.

achrn

Do you have a multimeter to put on the signal wire and see what the voltage is being presented to the duet as the switch switches?

I found a schematic on the web (of doubtful provenance) thats suggested the switch would be high when filament present.

davidewen

@alankilian

I'm in the middle of a long print.
I will test when it is finished.

davidewen

@achrn

5v which I suspected.
I have it wired to the 5v on io0 pin header

Wiring is:
V to 5v on io0
G to G on io0
S to io0.in
(I'm assuming this is correct and that it's not supposed to be wired to the io0.out)

kb58

@davidewen using X.in is correct.

achrn

@davidewen said in Filament Sensor:

@achrn

5v which I suspected.

And does it drop to 0V when the filament is absent?

davidewen

@alankilian

Jump:
G to io0.in

Result:
M591 D0
Simple filament sensor on pin io0.in, disabled, output high when no filament, filament present: yes

Jump:
5v to io0.in

Result:
M591 D0
Simple filament sensor on pin io0.in, disabled, output high when no filament, filament present: no

So, based on your post, my wiring is incorrect.

alankilian

@davidewen

OK, that's good news, it shows that your board and configuration are working properly.

Now connect the sensor and measure the voltage between io0.in and ground on the Duet.

Press the switch, what is the voltage?
Release the switch, what is the voltage?

If the voltage does not change, you can measure the voltage between S and G on the PCB of your switch.

If it changes on the PCB but not at the Duet, you've got a bad connector or wire.

If it does not change on the PCB, follow the traces on either the NO or NC terminals on the switch back to the Power and Ground connections on the connector and see if there's a break somewhere.

davidewen

@alankilian

Thanks for your help Alan.
The wiring was incorrect. Now that I have it correct, it's working.