The company Feller sells a wall mountable ‘Smart Light Control’: this provides 4 push buttons compatible with the Philips Hue system (on, off, dimming, etc). Unlike many other remote controls and buttons it is a great design and available in different colors. Feller does have a ‘classic’ wall switch series too, so this one is perfect to replace or augment an existing installation and make it ‘smart’.
Feller Smart Light Control
Another cool feature is that it is a ‘battery-less’ switch using EnOcean Energy Harvesting: the energy to transmit a wireless message is generated by the push itself: so no need to replace batteries after a few months or years.
Why doing this? It is part of my ongoing project to update and upgrade a bathroom (see Building a DIY High Density Philips Hue LED Stripe), so more to come probably over the next weeks.
I intended to use the Feller switch as a replacement for a ‘classic’ switch. However it came as a version to mount *on* the wall using adhesive stripes or mount it on top of the wall, but not as replacement for an existing switch :-(.
Feller Smart Light Control unboxing
What is missing is a mounting bracket or ‘bridge’ which I have found out later: they sell this as an extra for around $10: just a piece of plastic with 4 screws 😦
Feller Mounting Bridge
The solution: make a 3D printed version 🙂
Feller Mounting Bridge Model
You can find the files on Thingiverse. Printing a single bridge only takes around 10 minutes.
3D printed bridges for Feller
Installation
Carefully remove the covers of the switches:
Removed covers
Then take out the inner part with the electronics:
electronics
WARNING: 230 Volts are dangerous!!!!!! Leave this to someone authorized dealing with electrical installations!Â
Have the old switch removed. Keep the Feller aluminum bracket or use a new one.
Alu Bracket
Using two normal wood screws, mount the 3D printed bridge behind the aluminum bracket.
Mounted 3D printed bridge
Using the two screws provided in the package, mount the cover on top of it:
Mounted backplane
Then click-in the electronics board (check the marker with ‘up’ on the back):
Inserted Electronics
Finally, click-in the covers:
Finished mounting
That’s it! With this I have replaced my classic switch with an intelligent battery-less switch.
Happy lighting 🙂
Links
- Feller Smart Light Control: https://www.feller.ch/de/Produktangebot/Funktaster
- EnOcean Energy Harvesting: https://www.enocean.com
- Philips Hue: https://www.philips-hue.com
- Files on Thingiverse: https://www.thingiverse.com/thing:4713996
MCU on Eclipse 
Nice. I think more people need to use their 3D printers for little projects like this more.
I’ve done a ton of little projects like this using my printer.
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I use my 3D printer mostly for this kind of things: small replacement parts or mounting points and enclosures for boards. To me this is the primary benefit of such a machine: making things which are otherwise not available.
I decided to publish this one as I feel many others might lack such a Feller bridge piece as I have seen in forums, with the hope to be useful for someone else.
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