I had this problem …
… and came up with this solution:
I ended up with an Aeotec Nano-Dimmer in each bedside lamp under the control of their local switches. These, in turn, are under the control of (associated with) another Nano-Dimmer behind my wall switch.
This post addresses my next problem: How do I make this wall switch look like all the others in my house? For example, like this:
All I need is the look of this switch – not its smarts. I bought one off eBay just for its touch plate and LED assembly. For the touch sensitive smarts, I got this
This can be powered off the “Touch Panel” interface of the Nano-Dimmer. The top pin provides 3.3V and right below it is ground.
The power connection can be made with this
The dumb touch pad from the Legrand Adorne switch can be used to extend that of the smart touch pad. To do so, I mounted these together with double stick tape and bridged their pad connectors with a short bit of wire.
Unfortunately, the smart touch pad will not integrate directly with the Nano-Dimmer. I used this as an adapter:
I powered the relay of the adapter separately/directly from the Nano-Dimmer 3.3V supply.
The COM and NO outputs of the relay are connected to the COM and S1 terminals of the Nano-Dimmer.
The input (IN and GND) of this adapter drives an LED circuit. This is an LED (embedded into an opto-isolator which switches the relay), an indicator LED and a current limiting resistor. This LED circuit is not much different from the LED circuit built-in to the smart touch pad which lights while the pad is being touched. See
In fact, the relay adapter’s LED circuit can be used to replace that of the smart touch pad: Remove R3 and the LED from the smart touch pad. Then bridge over the pads of R3 with a bit of wire and wire the pads of the LED to the IN and GND connectors of the adapter, observing polarity. Use hot glue as a strain relief on the wires so that they don’t rip off the surface mount pads (I ruined one!).
I drilled a hole slightly above the LED (just removed) on the smart touch pad to poke the Legrand Adorne indicator LED through. The rest of the Legrand Adorne 120V AC LED circuit (diode and 820KΩ resistor) was discarded and replaced with a current limiting resistor to achieve the proper dimness when driven by the 3.3V DC Nano-Dimmer supply. I had/chose a 10KΩ resistor but 47KΩ probably would have been better. The LED and resistor were hot-glued in place.
I mounted the touch pad assembly in a Legrand Adorne metal plate and secured it from the back with hot glue. I shortened the relay assembly slightly so that it would fit above the smart touch pad and between the metal tabs on the plate. Like everything else, I hot-glued it in place.
With this Nano-Dimmer’s external switch configured as “momentary”, pressing and holding the touch pad will cause the Nano-Dimmer to alternately brighten and dim its load. Likewise, if the Nano-Dimmer is associated with others (as the one in my wall is associated with those in my lamps), those may be dimmed.
The hard part was stuffing all of this in a one gang electrical box!