From Dusty Tablet to Smart Home Hub: My DIY Home Assistant Panel

It started on a lazy Sunday when I found an old, $30 Android tablet buried in a box of forgotten gadgets. It still turned on, the screen was just a little scratched, and the battery held a respectable charge. Instead of tossing it, I wondered: could this be the missing piece for my Home Assistant setup?

Fast forward a few evenings of tinkering, a couple of coffee‑filled nights, and a handful of cheap parts, and the tablet now lives on my kitchen wall, displaying lights, climate, media and more – all without a single extra‑cost subscription.

Step 1 – Pick the right tablet. Anything running Android 6.0 or newer will do, but I’d recommend a device with at least a 7‑inch display and a decent Wi‑Fi antenna. My choice was a generic brand sold on a marketplace for $29. It had a 1280×720 screen, which is crisp enough for widgets but not so big that it overwhelms a bathroom or hallway.

Step 2 – Trim the software. I didn’t bother rooting; the stock OS was fine. First, I cleared out the pre‑installed bloatware – those "quick launch" apps that never get used. Then I installed three key pieces: the official Home Assistant Android app, WallPanel (a Kiosk‑mode webview), and Fully Kiosk Browser (as a fallback). Both WallPanel and Fully let you lock the device to a single URL, hide the navigation bar, and keep the screen on without draining the battery.

With Home Assistant’s panel_iframe integration I created a dedicated Lovelace view – a clean, icon‑heavy dashboard that fits perfectly on a tablet screen. Then I pointed WallPanel to that URL (my local Home Assistant address). The app took care of rotation, swipe gestures, and even optional voice commands via Google’s speech‑to‑text API.

Step 3 – Power it for life. Tablets love to run out of juice after a few hours, so I bought a cheap USB‑C wall charger and a Y‑cable. One side powers the tablet, the other powers a Bluetooth speaker I use for alerts. To keep the setup tidy, I routed both cables through a small wall‑plate with a built‑in USB hub. No more tangled cords hanging like spaghetti.

Step 4 – Mount it like a TV. This is where the project gets a little DIY‑ish. I ordered a VESA‑compatible tablet mount (about $12) that slides onto a standard 75 mm bracket. It fits the tablet’s dimensions snugly, and the bracket has a little hole for the charging cable. I screwed the whole assembly onto a piece of drywall using drywall anchors. The result? A flush‑mounted panel that looks like a commercial smart‑home control at first glance.

Step 5 – Add the finishing touches. A few optional extras make the experience feel polished: a motion sensor that wakes the screen when you walk by (implemented via Home Assistant’s binary_sensor.motion), a tiny night‑light strip behind the tablet for a subtle back‑glow, and a custom sound for doorbell alerts played through the Bluetooth speaker. All of these are controlled through automations in Home Assistant, so you can tweak them without ever opening the tablet again.

Looking back, the whole build cost me under $60 – a fraction of the price of a purpose‑built smart‑home hub. The biggest win, though, is the sense of ownership. I get to decide exactly which entities appear on the dashboard, the colors, the layout, even the language. And when a new integration lands in Home Assistant, I simply add it to my Lovelace view and refresh the page. No firmware updates, no subscription fees, just pure, open‑source flexibility.

If you have an old Android tablet lying around, give this a try. It’s a weekend project that pays for itself the moment you start using it to turn lights on, check the thermostat, or see who’s at the door. Happy hacking!