I’ve got an “old-school” heating controller, which has some switches to set some actions to “auto/on/off”:
I’d like to automate the physical switching of those switches for all three states. Is there some kind of motor and/or other means to achieve that? There’s all-in-all 16 of that switches and mostly relevant are five of them (which in my use cases one of them has to switch to “OFF” whereas others have to be switched to “ON”… 
Thanks for help!
Disconnect them and use two relays to switch between them.
I don’t think there is any three state relays.
would be the last resort. I’ll lose the possibility to really switch manually!
Not necessarily. You could still have these switches as input to the ESP.
But you will be using a lot of pins so probably more than one ESP.
Sorry, but I couldn’t resist (just for the fun of it):
You are prob looking to use a 16ch ESP based relay board and wire the physical switches into the common port of each one with the normally open and closed going to/from the device they control.
i.e
This will always have it in one of the states. The middle option is also an option.
Funny enough: This could be a viable solution for me!
one above and one below.
challenge would be to “know/remember” the state of the switches and especially to time the motor to push for automatic in the middle.
sounds like a fun project! Perhaps a bit over-engineered, but fun nevertheless!
