Well, problem is programming-related, but main problem is a naming, so I guess it's a correct place to ask.
I have various type of devices designed to affect environment conditions. Typical examples would be heater (affects temperature) or sprinkler (affects humidity). It should turn on/off if measured value are above or below specified limit. So I save a
sensor to measure conditions and
... to try to affect these conditions.
Can you think of any generic name (
...) which would describe this kind of device?