Thanks for troubleshooting the code. Looking at it more…It works with one sensor but not with both on the same I2C hub. It seems that there is a problem when both grounds are connected to the hub with the sleep/RTC pin. I have tried multiple hubs/cables to no avail. Starting to think it is a conflict with one of the sleep functions/libraries because I can run 2 sensors on this hub just fine if I don’t have the sleep code.