Hi, quick question,
I have a K type thermocouple that is about 1 meter away from the MAX6675 module. I don't have a lot of space to run wires. Can I use thin 32AWG wire or does it need to be thicker?
As the current is very low you just have to take care that the used wiring has a low resistance, else the results may be not as accurate as you would expect. But the wires don't have to be thick.
Thanks, basically trial and error. Will try and see the difference if any.
If you connect the thermocouple to copper wire and then to the module, expect to have an offset in your reading. Each change in materials causes a voltage change (that is how a thermocouple works). Most of the thermocouple chips are made to compensate for the one change in materials from the thermocouple to the module, but will not compensate for any additional junctions.
Would it then make sense to move the MAX6675 to the termocouple and then run the 3 SPI lines to the Arduino? Then again idk how that affects the communication
The most common answer of my google search of the maximum SPI bus length, is 3m/10ft, longer if you take and make other design considerations in selecting the wire. It looks like 1m SPI connection should work. You could also get longer thermocouple. The length of the wire allowed between the module and the welded junction is 100 feet.
Ill just test and see what gives the best result. Thanks for the help