Getting ready to use my cooler as a refrigerator for Thanksgiving and Its have trouble maintaining 40 degf. I’m attaching a short video of what the Spark display is doing… I have disconnected the temperature sensors one at a time and it is still doing this. I have restarted the Spark and the RaspberyPi.
It looks like something is causing errors in onewire communication.
I have seen this in the past because of very long onewire cables or a noisy VFD controlling a pump, causing electromagnetic interference.
If you have 2 onewire sensors running in opposite directions, this could maybe make the problem worse by forming dipole antenna.