So i have a school project i am doing i am trying to replicate this guide i found in this site Arduino Playground - BarebonesPIDForEspresso
and i am having some issues, my thermocouple is not givving me correct tempratures, for instance when i put the thermocouple in boiling water i get 120-130 F, if anyone can help my i would apreciate it. Any information you need about my thermocouple or anything else just let me know
Any information you need about my thermocouple or anything else just let me know
No, that's OK. We don't need to know anything about your thermocouple, your circuit, or your code. We have crystal balls.
Well, mine are brass, actually, so I guess I can't help you.
can i post the aliexpress link that i got them from ?
koutsou96:
can i post the aliexpress link that i got them from ?
I don't know. Can you?
This is the thermocouple i use, with a ad595 amplifier and an arduino uno
Please see reply #1 again. Now, we know which thermocouple you are using, but nothing else.
This i exactly how i have my arduino set up, the only difference is the thermocouple
Weird. The blurb says "Stainless Steel High Temperature Mayitr K type Thermocouple 0~400C Temperature Sensor 100mm Probe 3m Cable Wire Length", further down it says " Max Measuring Temperature: 120°C & Above "
How is "120c and above" a max temperature? What happened to 400?
As for calibration, beats me. Normally I'd start with the datasheet for the thermocouple, but the page doesn't appear to have a link.
As it is, you might just have to grab a thermometer and find out what numbers you actually get at various water temperatures. The sales blurb claims that the device is stable. Hook it all up, print out what numbers you actually get on the analog input when the water is at the correct temperature, and explain to the PID controller that that's the number it should be aiming for.
That is what i've been trying to do, i stabilize to around 100F cause the only thermometer i have around has a max of 120F but when i try to read high temperatures like boiling water i get temperatures from 120 to 130F on the PID
i think i have found the issue but have no clue as to how to fix it, seems like the ad595 amplifier also has a "thermometer" on it and its reading the ambient temperature and lowering my thermocouple readings. When i rub the amplifier with my hand the temperatures start to go crazy as shown in the photo, is there a way to stop the amplifier from giving its own input ?
