Rules - map variables to each other?

[flatsiedatsie]

This may be a little far out, but I'd be curious if there are any ways to generate this functionality.

• I have a device with a humidity sensor ( between 0 and 100% ).
• I have a device with a servo that can rotate ( between 0 and 100% )

I'd like to map the value of the first to the value of the second, so that when the first one changes, the second one follows. For example, if I glue a little paper arrow to the servo I could make an analog data dashboard.

This functionality could be used in many more situations though.

• Turn an air fan higher the warmer/dustier it gets.
• Turn a light brighter the darker it gets.

A user may also want to invert this.

• Increase the speed of the bubble blowing machine the less people are in the room.

Thinking out loud, a hack might be to create 10 rules, each going something like:
if humidity > 90, then set servo to 95%
if humidty > 80, then set servo to 85%
etc

I'd be curious if functionality like this would be interesting, or if it would just complicate things (pun intended).

[mrstegeman]

I believe this is a duplicate of #805.