I have multiple thermocouples (TCs) going to MAX31855 ADCs (1 per TC), which all connect to a common SO bus going to an Uno. The schematic is attached. The setup works fine for a single TC, but all output readings go to zero when hooked up in series. There is a common voltage bus (5V from Uno --> 3.…

Thermocouples, MAX31855 ADC and Uno Problems

kg4wsv August 13, 2012, 8:04pm 2

Sorry, I can't read eagle 6 files.

Code?

Are you driving the CSn lines high, except for the one you're reading? The MAX31855 has an active low CS.

-j

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