#Solved. K500 thermocouple install

1 messages · Page 1 of 1 (latest)

jaunty fern
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Is there some additional context to this question? I mean, at the simplest level, i feel like the answer is "You plug it into a thermistor port and a heater port, same as any hotend"

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Wait...I just realized

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k500? Like, a thermocouple?

heady granite
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Yeah, I've tried that, but I can't get klipper to read the values properly. I've tried everything. It seems to me that using this sensor is not just plug and play like for PT1000 for example.
I've found out something about MAXxxxxx temperature sensors, but I don't really know how to set it up.

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Yes, thermocouple.

jaunty fern
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Sorry, I was thinking t-d500, which is a normal, if slightly annoying thermistor

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A thermocouple though, ya, that's a whole other thing

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And a fairly problematic one, unfortunately

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The octopus definitely isn't equipped to read that with on board hardware

heady granite
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K500 thermocouple install

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I was searching for the answer whole day and couldn't find anything useful.

jaunty fern
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It can be read by something like a max31855, which klipper does support, but you'd need to get that, and wire it into an aux port or something

heady granite
jaunty fern
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Mind if I ask how you ended up with that particular temp sensor?

heady granite
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I just wonder if someone knows something, or if I should just switch the sensor for PT1000.

jaunty fern
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I know something

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I'm telling you

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You would need a max31855 module, such as the adafruit one

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You would need to wire it into an accessible spi bus (there are a couple available)

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And then you would need to configure klipper to read it. (The config is reasonably straight forward)

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Or, as you say, you could just get the pt1000 version

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That is definitely the simplest, best supported path

heady granite
jaunty fern
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Fair enough

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Back in the early days of 3d printing, thermocouples were used a fair bit

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Not so much these days though. I think some of the duet hardware may have built in support, but that's the only place I've seen it

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Every where else, you're unto additional modules

heady granite
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Triangle Lab is selling new heating core with K500, so I thought that its just a new type of sensor and at that time I wasn't really questing it if it will be a big peoblem to install.

jaunty fern
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Though tbf, I think that adafruit module I mentioned is $15 , so it's not a huge barrier

heady granite
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Is there some kind of guide how to use it with Adafruit?

jaunty fern
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Nothing super specific. There's an "spi3" port on the octopus that should be available for wiring it in (3 wires for spi proper, plus power& gnd)

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And then just the config snippet for that chip from the klipper docs

heady granite
jaunty fern
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That appears to be a usb interface?

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I'm taking this guy

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(Though I'm sure you can find clones of it on ali too)

heady granite
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Perfect, this is the amplifier I saw today somewhere. Thanks a lot.

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I've read, that Octopus v1.1 already has a amplifier like this. Am I wrong?

jaunty fern
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Not to my knowledge, but show me a link and prove me wrong!

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The octopus pro has a max31865 (note the second last digit), but thats only on the pro, and the 65 is for rtds, not thermocouples

heady granite
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You are definitely right. All of this is completely new topic for me and I'm kind of overwhelmed from that.
At least now I know, that there is now way I can make it work just by changing my config.

jaunty fern
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Unfortunately correct. It is not fundamentally a software problem

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Hmm. One other thing to throw in to your consideration

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How long is the lead on the thermocouple?

heady granite
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around 1 m or 3 feet? 1,5m max

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you think that the extra lenght could be a problem?

jaunty fern
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So we're kinda at the edge of my knowledge here, don't take this as a complete answer

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But I believe when extending thermocouples, you have to make sure to use the exact same type of wire as the original

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Having a wire type change messes up the readings

heady granite
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wow

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I thought that I will upgrade my hotend and after that my Trident will finally run smoothly, but it will just collect dust instead 😂

jaunty fern
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I wonder if the temp sensor in the ace is swappable

heady granite
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I'm definitely changing K500 for PT1000.
Sometimes I'm questioning why I went the DIY route and didn't buy Prusa or Bambu Lab instead.

heady granite
jaunty fern
heady granite
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You are 100% right, but these types of moments are real pain in the ass 😄
I did found the amplifier for 3$, so I will give it a try, but the PT1000 is definitely my plan B.

jaunty fern
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Feel free to ping me when you have parts in hand

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Do you have what you need to wire it up to that aux port?

heady granite
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Don't know. What do I need?
I did bought a EBB 35 with MAX31865 a while ago. Will I be able to connect it directly to it or should I switch to PT1000 instead?