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In a smart switch such as Sonoff ZBMINI, do I need to connect both S1 and S2? I've seen tutorials only connecting S2 (on Aqara). (discuss.tchncs.de)

submitted 1 year ago* (last edited 1 year ago) by unknowing8343@discuss.tchncs.de to c/homeautomation@lemmy.world

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Essentially the title.

If only S2 (previous connection point from light switch to bulb) is truly required, then, wow, that makes things way easier to install.

I guess electrically it makes sense, I'm just weirded out it does not show in the instructions.

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[–] unknowing8343@discuss.tchncs.de 1 points 1 year ago* (last edited 1 year ago) (1 children)

After some research, all I've gathered is one report saying that you'll absolutely destroy the Sonoff if you try to do that.

I reviewed the Aqara manual, and the possibility is specified there, so that makes it quite probable that it simply is a forbidden configuration for the Sonoff, or even any smart switch that does not specify that possibility.

So, unless someone magically shows me it's possible, I am avoiding it for now, I'll learn how to pass cables through the tubes and avoid any burning for now 😅

The reasoning behind the "it will NOT work" is that Sonoff uses S1 and S2 to create a low voltage circuit. It's expecting low voltage, so it might break due to a voltage overload.

Here's a reference.

[–] kittenbridgeasteroid@discuss.tchncs.de 1 points 1 year ago* (last edited 1 year ago)

S1 and S2 are only for the activation switch. You connect the actual device that gets controlled to Line Out.

If your setup doesn't require a physical switch, then nothing gets connected to S1 and S2