Great! You might be able to do it with a scene in the app. Perhaps others can offer some ideas on that.
i have the same scenario, but i don't have space to install the sonoff 4ch pro.
I was wondering if somehow i can achieve the same only using T1 switches. What do you think?
Thanks a lot.
And, what if I want to do the same as Varun but using 2 Sonoff Wall Swithces? How should I wire the circuit?
As far as I know you can't use the wall switches with existing 3-way switches left in place as the original poster wanted to do. They only provide Normally Open contacts. You can replace both switches with wall switches by using one as the actual switch and one as a dummy switch with the two connected with a scene. This setup has been discussed many times on this forum. Search it.
I once proposed a 3-way switch that included a current monitor both here and on other forums but I am not aware of any manufacturer who has yet offered one. A switch with NO and NC contacts could be used to replace a 3-way switch and the current monitor would tell the app if the light was on or off. If someone would produce one of these simple devices they would have a true replacement 3-way switch that would work in harmony with the old existing mechanical switches.
Thanks for both answers.
Varun, how should I wire the circuit to make it work, and how should I set the scenes?
Did anyone manage to create a EWE scene using 2 channels of the 4CH Pro, so that one Alexa command could toggle 2 channels together?
I would like to implement the intermediate X-over switch circuit which is achievable, but the EWE control of 2 channels is lacking.