joshch

Thank you so much! This fixed it for me.

Dear Digilent community, I am currently running into a common mode error with a thermocouple attached to the mcc134 hat. When plugged into a handheld reader, the thermocouple gives a valid reading, however when attached to the hat, it gives a common mode error. I have also tried plugging in other thermocouples to the hat, with said other thermocouples working correctly. This thermocouple has worked with the hat in the past, just several days ago, with no changes to the code. The TC is currently attached to a metal vessel, and works with the hat when unattached. I suspect it is some grounding issue, however I am not sure how to handle this issue. Thanks in advance. The TC in question is https://www.mcmaster.com/3857K212/ In summary: TC works with handheld thermocouple tester, while attached to the metal vessel TC worked several days ago, on the same hat, on the same port, with the same code Other TCs work on the same hat, on the same port The TC in question does not work on any other ports either I now get a common mode error when the TC is attached to the metal vessel, yet I can get actual readings when not attached to the metal vessel.

To all who can help and those experiencing similar problems, I currently have two MCC 134 hats connected on my raspberry pi, with one of them at address 0, and the other at address 1. When running daqhats_list_boards, the board at address 0 appears, but the one at address 1 does not. I can confirm that both boards work however, as I am able to get TC data off both hats. My goal is to update/write the eeprom of the board at address 1 so that I no longer get the warning "warning - address 1 using factory EEPROM default values". When looking at documentation, the recommendation seems to be to use the DAQ HAT Manager utility, however I do not have the Raspberry Pi OS desktop interface, and am interfacing with my raspberry pi through putty. Is there a way to write the EEPROM of the hat without using said DAQ HAT Manager utility? Thanks in advance, any and all help is welcome.