MAX31855 Problem

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MAX31855 Problem

Postby JackJohn77 » Fri Jun 21, 2019 2:22 am

Hi, I'm having problem reading temperature from a max31855, I can't read a temperature from the thermocouple (adafruit library send a nan value) but the internal temp reading works.

So I think the problem either come from the thermocouple or the chip. I also observed when poking around with a multimeter that the T+ and T- pin are grounded to the ground pin itself, is that normal ?
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Re: MAX31855 Problem

Postby tayken » Sun Jun 23, 2019 12:42 am

According to the code the chip thinks thermocouple is not attached: https://github.com/adafruit/MAX6675-lib ... 75.cpp#L40

Probably there is a short somewhere. I would take off the thermocuple and start poking around with a multimeter to find any shorts on the board. Seeing how T- pin is right next to GND pin, there may be a short there.
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