I’m looking for a way to automate a central heating thermistostat (different from a thermostat in that it gives a changing resistance to room temperature rather than simple on/off). The best way I can think of is a rotary servo, like the ones for key turning but finely changeable in a 360 degree range. I would remove the knob and attach the servo to the shaft.
Has anyone seen something like this as a project or current hardware?
Hi
How does it contol the heating by varying resistance? If you give more info it will spark more interest from people.
Thanks Spiro,
The pictured Thermistostat works with a brand of warm air heating. The device detects the room temperature using a thermistor and this generates a resistance value to the heating system. The system then intelligently regulates the gas and fan system to maintain the given temperature selected on the dial. It’s NOT like a thermostat that is simply on/off.
I would like to be able to automatically control the dial setting on the Thermistostat as I think building a replacement automated unit might be too complex with no circuit diagrams!
Thanks Spiro,
That might just do it!! 
Do you have the link to the project?
There is bound to be more polished projects out there. Google search might be better than searching in Homeassistant.
