Btt octopus 1.1 pro unable to get inductive probe to work

General Discussion
1

Basic Information:

Printer Model:
MCU / Printerboard:
Host / SBC
klippy.log

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Describe your issue:

…i changed electronics on twotrees sk1, with mb btt octopus pro 1.1, raspberry pi 4b , toolhead mks THR42 , fystec canbus. ive managed set up klipper and all the configs etc. but one stumbling block the inductive sensor does not work , i have now change twice thinking sensor maybe faulty.

its connected to the toolhead board mks thr42 to the dedicated probe port 5v and i measured with a multimeter while printer is on and i see its receiving 4.9v and 5v yet it does not work when attempting to home always nozzle crashing.

i dont know what ive done wrong, please somebody help

2

Hello @ynm078 !

Please attach it to your next post.

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3

What is the part number of the inductive sensor that you’re using?

How do you know that it is supposed to work with a 5V supply? (Many don’t.)

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klippy(3).zip (23.8 KB)

5

previous toolhead board shows it was 5v it was connected

2_e06e4a15-98ec-4f78-8601-d8715a5aa023
2_e06e4a15-98ec-4f78-8601-d8715a5aa0231000×1000 12 KB

6

IMG_20250706_163637
IMG_20250706_1636371864×4096 513 KB
previous toolhead board

7

Any other changes? A longer hotend?
The probe can’t work if the nozzle crashes before the probe is close enough to trigger.

8

probe does not trigger at all, usually a green light illuminates

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same probe from previous set up

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all components are from the same as factory

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image
image740×741 68.1 KB

We’ve all done it… any chance the plug is in backwards?

12

You said you measured the voltage across “V” and “G”.

Have you measured the “S” voltage? Can you measure it when you bring something metal close to the sensor?

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No plugged In correctly I’ve gone through these people possible mistakes

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I haven’t measured S but I’ve tried raising the build plate CLose to the nozzle to see if there is any reaction but no

15

I suggest you unmount the sensor from the toolhead but leave the connections in place and then look at the signal pin (using a Voltmeter) while bringing something metal towards it (a build plate, pliers, etc.) to see if it changes state.

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