this post was submitted on 28 Jul 2025
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Lights are one of the areas where I think automation is genuinely useful, but my rule with anything "Smart" is that it has to be able to run 100% locally.
It also needs to fail gracefully. A smart switch needs to fail to a dumb switch, not "no switch".
and retire gracefully, where the device becomes open source and available to the community of owners who have invested in it.
You're absolutely correct. I have few smart switches around the house and automations for yard lights and stuff like that are pretty nice to have but I still have the physical switch where the dumb switch was to interact with if the automations are down or I just want to override them. The ones I use even accept the same faceplate than traditional ones so there's no change on anything unless you want to automate things.
Exactly this. I use Shelly relays in the switch boxes and use the physical switch as an input to the Shelly relay. I have a couple AliExpress zigbee relays too that work well.
The trick is with three/four way switches where the smart relay needs continuous power and to be physically located at the end of the chain where power is actually switched to the light or outlet. Took me a while to figure that out but an SPDT relay with 120V coil solves that. The problem is space: fitting the relay to provide continuous power to the smart relay and the smart relay itself into a standard junction box with a physical switch and all the usual mess of wiring is not easy.