This got me so close to figuring my case out! I have a Shelly 2 dimmer I’m trying to install into my two-way on/off switches. With this method I managed to get the 2nd switch to perform correctly (on/off) while the Shelly does its job too (full control). But the 1st switch is completely irresponsive. Is this expected because I’m using a wrong Shelly model?
Hello I wanted to confirm with this you can control if the light is of or on always from the shelly module and that if another switch turns it on you are aware of it. Is this the case?
So in my current setup I can use the module as one more switch in the 2 or 3 way switches. But the module is unaware if the light is on or off, its just one more switch. I can turn the light on/off with the module but if another switch turns it on I am unaware.
The only way I have seen to be able to do it is to put the module after the last switch directly to the light, but sadly I dont have access to Live or Neutral in the last switch.
Correct. If either of the two switches turns on, HA is aware of it and adjusts state accordingly.
I appreciate I’m replying to an old topic but I’m just coming across this situation myself - making a two way switch smart - but with old style wiring where there is no neutral at the switches.
The top diagram above is exactly my scenario. I can’t put a device at either switch as one switch ONLY has a permanent live and one switch ONLY has a switched live. Neutral is at the light fitting.
What I can’t find a firm answer to is what goes into the SW terminal on the shelly to tell it the either switch has been activated.
The above diagram shows the grey wire - which appears to be the switched live out of one of the switches (which can be picked up at the ceiling).
However this means it carries mains voltage 230v when its switched, and all the information I can find online is that the SW terminals on these devices should NOT have 230v applied to them, and only a ‘dead’ switch wire that effectively closes the relay.
Can anyone help me clear this up?
Even the shelly diagrams above show 230v going to SW through the switches from the mains so it looks like they can have it.