Inductive Probe not working (led always on)
Hey guys, I need help getting a inductive probe from pepperl & fuchs to work.
Today I got an inductive probe from Pepperl & Fuchs (NPN NO) and I connected it to my octopus 1.1. Its connected according to the ratrig doku and the octopus pinning. But for some strange reason, the LED of the probe is always on. No matter if I touch metal or not.
Any Idea what could be the issue?
Regards!
50 Replies
foreign-sapphire•16mo ago
foreign-sapphire•16mo ago
that indicates the probe itself doesn't work or is miswired
wiring looks correct
foreign-sapphire•16mo ago
I know, BUT this is actually already the second probe that I ordered cause the first one showed the same behavior. But i dont think its likely that both are broken
https://files.pepperl-fuchs.com/webcat/navi/productInfo/pds/304615-0117_ger.pdf?v=20230215161412
What i'm trying to say is you can't change this behavior via config
If it doesn't change the state of the LED when you touch metal to it, it doesn't detect your metal.
Most likely it wants more voltage
Even though it says it works from 5-30.
In that case you'll have to use the probe port, which doesn't work with NPN probes (if that's a Octopus 1.1 i'm seeing).
So you'd have to get a schotky diode to solder in.
foreign-sapphire•16mo ago
... ah ja. do you have more information for that? funny thing is that this probe is sold by squishworx as PINDA
Did the probe come with a wiring diagram? Could be that it isn't wired like it normally would be?
it's rare that they fuck the colors up
According to the wire colors in the pic it's wired correctly
foreign-sapphire•16mo ago
foreign-sapphire•16mo ago
thats in the data sheet
Wait, isn't that picture showing it is connected to the bl touch port and not the prob port?
GitHub
BIGTREETECH-OCTOPUS-V1.0/BIGTREETECH Octopus - PIN.pdf at master · ...
This is Octopus open source material. Contribute to bigtreetech/BIGTREETECH-OCTOPUS-V1.0 development by creating an account on GitHub.
foreign-sapphire•16mo ago
foreign-sapphire•16mo ago
its the same port?
Ok, sorry. My brain is fried after a long day at work
basically you just solder in a BAT85 diode in the signal wire.
and connect the red wire in your pic to 12 or 24V.
foreign-sapphire•16mo ago
so you really think 5V isnt enough for this probe
Before you do anything, measure the output on the signal wire with a multimeter
foreign-sapphire•16mo ago
ok what results do u expect
I don't know. I can see it says 5-30v in the datasheet. So that's my best guess, if it doesn't change the state of the LED when holding metal to it.
If it was functioning correctly, the signal wire would be ~5V when the probe senses metal, and ~0V when it doesn't. When connected to 5V that is.
foreign-sapphire•16mo ago
between black and blue I have 0,xx v
at all times?
foreign-sapphire•16mo ago
ja
Yeah so it's not working
It's not sensing metal
Only thing i can think of trying is using a higher voltage (because it's a 5-30V probe, it works best closer to 30V)
foreign-sapphire•16mo ago
can I just hook it up to 24v
Yes as long as the signal pin isn't connected directly to a GPIO pin
(because then it'll fry the mcu)
foreign-sapphire•16mo ago
I mean for testing if the LED status changes
Same answer 😄
foreign-sapphire•16mo ago
yes
I unplug black
so - sorry for asking again - the led should trigger with only VCC and GND connected? no need to stimulate the pullup resistor?
foreign-sapphire•16mo ago
foreign-sapphire•16mo ago
24v does the trick.
conscious-sapphire•16mo ago
Where did you end up plugging it in? Out of curiosity for my build
foreign-sapphire•16mo ago
24v. Just to test. @miklschmidt had the idea that 5v isn’t enough
conscious-sapphire•16mo ago
ahh, interesting
thanks
Right so you want a BAT85 in the signal line.
Squishworx should probably stop selling those as a superpinda as those are 5V exclusively
They're also NPN NC, which you very much want for safety
foreign-sapphire•16mo ago
I will tell them
I know.
Seems like the Squishworx channel was deleted over night??
They deleted their user, seems like they vanished from the discord.
So the channel was deleted archived
foreign-sapphire•16mo ago
Great timing 🙂
It's still viewable here: #squishworx-🇺🇸
Honestly a little odd. Shoot them an e-mail.
foreign-sapphire•16mo ago
I did.
In the meantime I ordered another probe from Amazon
Where are you located? DE or US?
There are multiple sources for SuperPinda's in the EU, not sure about the US though.
foreign-sapphire•16mo ago
Since last June I am in NY. For 3-5 years
Aah
Lol squishworx even has the actual superpinda: https://squishworx.com/prusa-superpinda/
@_sebastianm i'd recommend you get that one 
gonna have a bad time with a janky probe. Of course i don't know what you found on amazon.
Aah the one you bought is a Pinda 2 replacement, ie. not a SuperPinda. Pinda 2 is a horrible probe.
gonna have a bad time with a janky probe. Of course i don't know what you found on amazon.
Aah the one you bought is a Pinda 2 replacement, ie. not a SuperPinda. Pinda 2 is a horrible probe.foreign-sapphire•16mo ago
I heard the opposite 🙂 that’s why I bought it
But thx.
The SuperPinda is more expensive because it has passive thermal compensation, the Pinda 2 doesn't (the original one has active compensation via a built in thermistor, only supported in marlin). It'll bounce all over the place on a heated bed, so completely unreliable.
Even with the compensation they were reported to be quite janky
foreign-sapphire•16mo ago
Bummer.
That's why we recommend SuperPinda's (it's also the probe we put in the default v-core 3 kits)
foreign-sapphire•16mo ago
I know.
Are you from .de?
Squishworx answered and refunded both probes.
foreign-sapphire•16mo ago
I'm from dk
That's good customer service 👍