3Gang box Wall HA display

jpremor · March 19, 2026, 10:38pm

Hey all,

As I finish my basement and had some automated lights with different controllers (smartthings, wifi, etc). The idea was a central location to turn on/off, set dimmer, color. The 3 gang wall switches was the best place for a display with Home assistant dashboard as people normally look for that spot to switch lights.

Spent some time looking around the internet for something ready and couldn’t find. Very likely there are others around but I was too incompetent to find.

I got today to a nice implementation that I’m very happy with and will now install in my other house floors.
I’m running a Rasp 3B+. Chose the cheapest capable for the task and it’s doing a great job. Got a display on Amazon from China but performs well and connects to the rasp like the native raspberry display. Also chose one with the smallest bezel possible. You will find commercial displays worse than this .
Found nice USB cable (short and capable of keeping the raps voltage, had to return many) and charger (holding the power needed, many returned as well). Did some wiring to the point it’s easy to install like any light or typical switch, but only two wires (ground not needed).
Made a 3D printed housing for the setup (many protos). Got to a nice design. No screws, no visible gaps, housing touches the wall. A bracket installed first, holds it all to the 3-gang.

Here it is.

Interesting is that this thing sits aside of a originally planned Ecobee and I can definitely remove from the wall now. I’m still thinking about it. Will need a sensor in a fixed location to replace it.

This rasp is running a specific light OS in kiosk mode. This was the most painful thing to implement. It boots directly to this dashboard, logging in a specific home assistant user account for this display.
In the rasp I also have an interface with MQTT that allows me to change display settings like below. You can see undervoltage events if they happen.

At the end it made a nice replacement for my 3 ugly standard switches, exactly the way I expected it to be. As I add to other house floors, I’ll post more photos. I plan on adding a 3 gang box where I currently have 1 gang. Just need something like this:

If you are interested please reach out.

jpremor · April 23, 2026, 7:54pm

Installed the second display. Now in a finished floor.

Here is an example how the USB charger goes inside the box.

The backside of the display with a short USB cable and the right USB charger to avoid under voltage warnings or resets on the raspberry pi.

Then on the wall. The location was specified by the builder to have a display for the alarm system they sell with the house but had a cover plate. Now it has something useful.

To start this is my dashboard, will keep adding and adjust things later. There are two main lights in the living room and kitchen that are dimmable and some other lamps are on/off. I plan on adding other features from the garage in here as the garage is there in the next door on the right.

Other things I completed.
To prepare for those with no technical skills, I created a setup wizard in a default webpage of the full page os to enable the user to setup WiFi, mqtt connection, host name of the device, URL of the dashboard, etc. Then after configuring and rebooting, it will automatically go to your dashboard. No need to know how this works, just follow the steps. Below the wizard first step to setup the WiFi.

With all that done, I decided to try to sell on eBay. Hope to get interest from others as much as the results were above my expectations.
If you like to be an early tester, I can send you at a much reduced price. Just message me or reply here.

Nick4 · April 23, 2026, 8:33pm

Nice, well done!

What OS is that so it can run in kiosk mode?

jpremor · April 24, 2026, 1:41pm

It’s the FullpageOS but I customized.