And one more follow-up - biggest face-palm ever: I had the GPIO cable reversed. Still seems like I fried my MAX31855 chips, but now I get readings of 0 through the RPi with it attached instead of an error at least. Once I get my hands on a new breakout board I'm a little more confident that I'll be ...

Quick followup: I've tried wiring up both the boards to an RPi with this driver/wiring suggestion then wiring them up to an Arduino, now they just seem dead - they both worked fine on the Arduino before. Given the blister I've got on my fingertip it seems likely that the chip is dead and this will b...

Thanks for the driver! It took a lot of work to actually get the SPI interfaces going, but now I'm having a lot of trouble getting a reading. With no GPIO cable attached to the Raspberry Pi I get promising output from the max31855.py script itself: pi@raspberrypi ~/max31855 $ python3 max31855.py Tes...