NPN probe on SHT42 does not react
Hi all,
I just fixed the port of the probe in the SHT42 config, by updating Klipper. (It is now PB1 as expected).
Nevertheless, the probe is reacting in wrong direction. The probe is always lightened and if I use a tool to get near by the light goes off... but Klipper shows it always as open.
These are my settings in the printer.cfg:
Inductive probe configuration
[probe]
pin: ^probe_pin
z_offset: 0.0 # Adjust this to fit your setup
Probe
[probe]
pin: ^toolboard:probe_pin
In the "old" RatOS, I used this setting:
[probe]
pin: ^probe_pin
Any idea why this is not working anymore?
8 Replies
Notice the
toolboard: prefix. That tells klipper that the pin resides on the toolboard instead of the main MCU. This is important, without it you'll be using the wrong pin and it won't work.
With regards to the light, that's not something you can change with config/wiring, that's a hardware property.Hmmm... but even that I already tried and it does not react in the endstop test
I can see that the light of the probe is switched off if I get close, but endstop test shows still open.
Tried that again, changing to ^toolboard: probe_pin and restarted the printer.
Then I put something under the probe with a steel sheet on top, to not damage the bed while homing the Z axis. It did not react, so I had to use the emergency stop-
Use QUERY_ENDSTOPS for testing
then you don't run the risk of damaging anything
oh yes, I should know that... Nevertheless, I just rerouted the probe down to the Octopus 1.1 and there it works perfect now, after setting the right configuration. May be the board has a glitch. We´ll see. Next week I get my Euclid and then I need to change the settings again. If it is just this single port which is somehow broken, I might use another one,or send this thing back.
It’s possible that PB1 can’t be used as an interrupt, but that seems unlikely
Most of these stm32’s can run all pins as either/or.
Pin-out not changed, just added a connector and a cable to it and sent it down to the board. Changed ports accordingly and... voila, it works. I will play around with it the next days. May be I will try out if the original port works, but now I need to print... So far, thanks a lot for your input.
If not try moving the pin back to PC15 (along with the pin in the config, so
^toolboard:PC15). I've been running my Z-Probe on the endstop port, so i haven't tested PB1.✅ Will try that tomorrow.
Thanks a lot