Tricky switched RGBW installation



Hi Everyone,

I have a socket under my island, controlled by a switch on the wall, intended to drive some island lighting (this is a socket my electrician installed at my request so I could easily retrofit under-island lights). This just has a live and neutral loop going to it. I also have access to a socket on the ringmain on the island. My goal is to install a Fibaro RGBW controller on the island to drive some LED tape lighting.

Like this…

What I’d like to figure out is how to have the wall switch turn the lights on/off (I’ll control brightness and colour from an app). I think I can do this:

Which would put 12v through the wall switch using the existing neutral and switched live wires, and obviously isolating it from the 240v live (!).

Would this work and would the switch toggle on/off in tandem with the app…?

@RobinWinbourne ? :slight_smile:

(Mark C) #2

can you not just put the 240/110v switchsed supply into the 12v transformer, the way the switch will isolate the transformer as well. normally these come back on on the state they were turned off from?

(Simon Tether) #3

If wired with the PSU in the switched socket, when the switch was off the app wouldn’t be able to turn the lights on ?

(Mark C) #4

ho often are you going to do it manually vs how often via the app?


I want to be able to control it via the app or via the switch at any time. If I wire it as you suggest Mark, the automation functionality via z-wave will be offline.

(Robin) #6

Assuming the wall switch is a toggle switch, you will need to change parameter 14 to ‘21845’ which will allow a single toggle switch to control all 4 channels at the same time (RGBW, Toggle, Brightness Mode).

By default, the unit wants 4nr momentary switches, but you don’t have enough wires to pull that one off.

The manual is very vague on parameter 14, but Fibaro provide a calculator here:

Your last sketch is correct btw. :+1:

(Ben Erkens ) #7

Make the wall switch a Smart switch.

Then you can toggle it by hand and by anything the SmartThings could do.

Grtn Ben


HI @RobinWinbourne, re parameter 14, would the settings for each of the four ports be (in binary):
0000 - nothing
0000 - nothing
0000 - nothing
= 0101 0000 0000 0000 which is 20480 in decimal?
I’d then wire the switch into port one?

(Robin) #9

I don’t think so… the description for brightness mode stated single switch… and all channels will need to be in brightness mode.

Use the calculator they provide… I wouldn’t try doing the binary conversions yourself.

(Pete) #10

Has anyone been able to add a simple on/off wall switch to turn the lights on and off? It could turn on to last used state or just turn on the white channel of the RGBW strip.

I have smarthings hub v2, but haven’t set it up yet since there’s no internet installed at the moment.


(Robin) #11

Yes, I have several working with various combinations of 1-4 switches.

You’ll need to tweak parameters, which can’t be done without internet, v1 or v2.

(Pete) #12

What actual switch can I use and would it be wired to IN1 and GROUND? I currently have a typical 110V light switch to use.

(Robin) #13

Regular toggle switch will work fine… wired to In1 and ground.

You’ll need to change parameter 14 to 25668 (if you wan the device to remember last colour before it was turned off) or 17476 without memory more:



Parameter 14 values need to be calculated using the Fibaro tool provided on their website:


Okay so I have learnt soooo much around the Fibaro RGBW module and it’s setup. I have finally got it working with smarthings using the right device handler :slight_smile:

Now I am configuring the switch as per above but feeling slightly out of my depth!

I have found some of the settings under parameter 14 that look like this

But where do I input the calculated value?


And in which case what do I do with the other values it then wants me to set!?

As usual THANKS in advance…

(Robin) #15

That particular handler calculates the value for you… just choose the 4 switch options (as you have already done), set everything else to the recommended defaults.


Thanks @RobinWinbourne I will give it a go across the weekend.

One other question… in terms of wiring it to a toggle switch - I actually have a momentary but will have to swap it out - … It is a twin and earth cable. I obviously don’t to pass any electricity to the fibaro (because it won’t be 12v) but I noted your comments around wiring it to In1 and ground. Any clues on what the wiring diagram would look like for using the twin & earth cable!?

(Robin) #17

I don’t get your question… cable type is irrelevant??? If cores are bunched together in a single cable, the diagram would not change.

Post a sketch of your existing wiring and I may be able to advise.


Sorry @RobinWinbourne I didn’t get the chance to respond to you on this and have been busy working rather than doing what I want to do…finish my home automation project :slight_smile: \

Anyway so I think I need to use the retractive switch twin and earth cable with the live going to IN1 on the RGBW module and the Neutral going to GND (without any power going from the lighting circuit as the LED driver is already supplying 12v)

is that correct? Will it allow dimming using this function from parameter 14? Or should I look at additional/alternative config for dimming? Wall_switch_with_Fibaro_RGBW_-RGBW_Controller-_Smart_Home_Forum_by_FIBARO

(Robin) #19

correct as drawn, however note that IN1 will only toggle the red channel.

You will need additional switches for IN2 and IN3 to control Green and Blue channels.

I setup two of these modules with a single momentary switch each on Sunday, and they are not behaving nice. I need to play about with some of the other switch settings but I ran out of time… I won’t be back on site for 3 weeks now.

(Alwas) #20

Hey Robin, I have a momentary switch via IN1 controlling all four channels, I’m using them for white led strips.