shadowbrush:
ScottG:
What exactly did you change in the code? I have three thermocouples connected to three Adafruit breakout boards. One is connected to a motor housing. The other to are in thermowells measuring water temp. I have had lots of problems (mostly reading 32F) maybe this grounding issue is the cause.I commented out Adafruit_MAX31855.cpp, line 71-74:
// if (v & 0x7) {
// // uh oh, a serious problem!
// return NAN;
// }
The MAX31855 will return the type of error that would get you the 32F reading. Use Adafruit_MAX31855::readError(). I don't have the error codes here, but it will tell you whether the probe is open or grounded. Holger
Just tried your suggestion, but it didn't help. My temp reading are fine when I only have one thermocouple hooked up, but as soon as I have more then one, I have problems. I'm giving up on thermocouples and am going to switch to 1-wire temp sensors.