Afternoon, I'm having some issues with my NTC thermistor and would appreciate some extra input.
I have calibrated the thermistor, and it should switch on and off a heat source according to the temperature.
After some tweaking, I was able to get the environment to stabilize at around 29 degrees on both the thermistor reading and the manual mercury-like thermometer.
It was fine a few days ago. Now I have returned to it, switched the circuit on again, and after leaving to stabilize I discover the manual thermometer is reading 25 degrees, but the thermistor still reading 29!?
This has happened a few times now. I'm certain there is no differing power drain caused by other entities in the circuit.