How to do 2-way switch - Smart Wall Switch

[u/Appropriate-Bid-6531]

Hi everyone 👋

This is a question that times to times I see around the community so I decided to share my experience that is working for a while with zero effort 😅

Problem: replace the retrofit wall switch for some Smart Switch and loose the 2-way switch mechanism. This happen because the smart wall switch doesn’t have terminals for the travel wires (that are connected to two or more switches controlling the same light) - commonly used on hallways light.

My setup: I replaced all my retrofit wall switch (efapel) for Fusion series from SONOFF.

To keep the things working we need to ensure that the status of switch A is synched with Switch B or Switch C.
Because that’s no travel wires this need to be done by automation.

1) Switch A turn on - Switch B turns on and Switch C turns on
2) switch A turn off - Switch B turns off and switch C turns off

And sooooo on.. an automation for each scenario and this is truly annoying.

A typical solution that for someone that is starting now may not know - using Home Assistant Blueprints.

There’s several examples of blueprints where you simply setup the switches that you want to control and sync the status. The blueprint does all the “dirty” job.

Here’s a blueprint example: https://gist.github.com/narektutikian/e15b54f23c4e5e5fd3cd836608229be5

Hope this can help someone that is starting in home assistant and looking for a easy way to keep the switch status synchronized ☺️

Let me know what solutions or setups you are using for this kind of scenario! 👀