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self actuating toggle switch?
(midwest.social)
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this post was submitted on 01 Feb 2025
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I'll throw my ideas in the ring. Warthog project on YouTube made these magnetic switches 3 years ago. I don't think they're quite what you're after though.
I just drafted this scuffed concept as well. No clue what your control looks like, or if an nmos would even work here (assuming com is ground) but perhaps this could work? It outright disconnects the physical switch to enable the electronic switch to take control. Perhaps you could somehow sense digitally when the spdt switch is toggled?
It would need some changes so it could be pulled to either side but that is the closest framework I’ve seen yet!
You could also consider a type C latching relay and a momentary switch as others have suggested.
Momentary stays disconnected in a middle position, then momentarily goes up or down. You could have that drive the relay coil one way or the other, and perhaps use some LEDs to indicate which side is on or off. You could then digitally drive the relay as well. It does mean you lose the latching of the switch, but its likely far less expensive.