I have 2 K-type thermocouples running on individual MAX31855 boards on a Raspberry Pi 3. The MAX31855 boards share a CLK pin but have separate CS and DO pins, similar to the set up given here: Multiple thermocouples on raspberry pi
Everything works great until i place both thermocouples on a metal surface which causes both thermocouple readings to be "NAN". I guess its a grounding issue? Is there a way to solve this?
Thanks in advance