I purchased few of these boards from China and haven’t been able to make it work with any available Arduino libraries, https://www.ebay.com/itm/222202249304 I get the following serial readings: MAX31855 test Internal Temp = 23.37 Something wrong with thermocouple! 2 nan Internal Temp = 23.37 …

MAX31855 K Type Thermocouple Breakout Board Temperature 1350°C for 3V-5V

system April 10, 2018, 3:37am 4

Appears the TC is connected backwards, the red wire is NEGATIVE.

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