Emulating a two way light switch with rules

Setup, Configuration and Use Scripts & Rules
,
1

I have two way switches controlling the lights in the corridor and I want to replace them with z-wave wall switches. The problem I see is that there are nobody is selling two way switches and all the diagrams I saw are dealing with z-wave modules wired to the mechanical switches.

I think I can emulate two way switch by wiring the light to one of the z-wave wall switches and using the other just as a “dummy” that will just send or receive status updates from the first. The question is how to do it? Should I use associations or rules? I think that rules would be better but perhaps I’m mistaken? And if using rules, can I also use a group:switch?

2

Yes you need to use rules:

You need to do something like this:

rule "Two way Switch"
when
    Switch1 changed or
    Switch2 changed
then
    if (Light.state == ON) {
        Light.sendCommand(OFF)
    } else if (Light.state == OFF) {
        Light.sendCommand(ON)
    }
end
1 Like
3

Thank you. I’ll try it this weekend. Right now I have to dig into the wall to find which of the wires is the Live and which are just the Com lines going to the other switch.

4

Be careful with that!!
You want to stay alive to play with OH!!

1 Like
5

I am trying to grasp what your problem is as my technical English is not that good. I understand that you have 2 switches that both operate the light in the corridor.
I have had the same setup a couple of times and I found 2 solutions:

  1. Use one switch to switch the light and slave the other switch to this switch within the zwave protocol. Do this through the Habmin interface.

  2. In an other case I used only one Fibaro zwave switch with a momentary switche on one side . The other side I fitted with only a momentary switch which wires I doubled on the Fibaro switch.

I favor the second as it takes less money out of your pocket.

6

I already have the two z-wave wall switches so there is no money saving potential there. The question was which approach is the best, either trying to work through z-wave association or a rule. I was personally in favor of a rule and I like the idea of Vincent, which I’ll try after physically replacing the switches.

7

Remember that both solutions I provided are not OpenHab depended. That for me is always a designrule not to involve complications if not necessary