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[Solved] How to detect the position of a dumb wall switch?
(sh.itjust.works)
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Sonoff makes a bunch of Zigbee smart relays, that can take input from a normal switch.
It's basically just a Zigbee relay that can connect and disconnect regular wires, just like a switch does. But it also has terminals for connecting a regular switch, which then just functions as a button that controls the relay.
Something like this: https://sonoff.tech/en-eu/products/sonoff-zbmini-extreme-zigbee-smart-switch-zbminir2