Project 18: Budget Magic Mirror (Under $80)

We’ve all been there: you stare blankly at your reflection in the bathroom mirror while trying to remember if your morning meeting got moved, wishing the glass could just tell you. Sure, you could drop two grand on a commercial smart mirror, or you could do what any self-respecting maker would do—violently dismantle an old computer monitor you found in a thrift store, duct-tape it to a piece of plastic, and pray you don’t release the magic blue smoke when you plug it in.

If you’re tired of debugging spaghetti code and just want a project that looks straight out of a sci-fi movie, this is it. We’re going to build a Budget Magic Mirror for under $80 by sandwiching a Raspberry Pi behind a two-way mirror. No soldering irons required today, though if you’ve been working through our Academy Lessons, you probably have a few burns on your fingers already anyway.

How the “Magic” Works

The secret to this project is a sheet of two-way mirror acrylic. In a bright room with a dark backing, it acts exactly like a regular mirror. But when a bright screen emits light from behind it, the text and images pass straight through the reflective surface.

By running a black background on our screen, only the bright white text (time, weather, calendar) shines through, floating seamlessly on the mirror.

The Gear You Need

To hit our budget goal, you’ll need to scavenge an old LCD monitor. The rest of the components are very affordable:

Raspberry Pi Zero 2 W - The brains of the operation. It’s tiny, cheap, and has enough power to run the display interface. (Check out Lesson 194 for a primer on microcontrollers if you’re new to Pi-like boards).
Two-Way Mirror Acrylic Sheet (12x12 or custom cut) - The magic glass itself.
An Old Computer Monitor (Ideally 19” to 24”) - Check thrift stores, Craigslist, or your closet. You will be stripping off the plastic bezel.
A Shadowbox or Custom Frame - To hold the monitor and mirror sandwich together.
HDMI Cable & Power Supplies - Proper power regulation is key. Revisit Lesson 169 on Power Regulation so you don’t fry the Pi.

Step 1: Upcycling the Monitor

The first step is carefully removing the plastic bezel and casing from your old monitor to make it as thin as possible. You only want the raw LCD panel and its control board.

Warning: Be careful around the power supply board, as capacitors can hold a charge even when unplugged. (We covered this in Lesson 102: Capacitors!)

Step 2: The MagicMirror² Software

We will be using the incredibly popular open-source platform MagicMirror². It’s supported by a massive community and has hundreds of customizable modules.

Install Raspberry Pi OS Lite on your microSD card and configure your Wi-Fi credentials.
SSH into your Pi and run the MagicMirror installation script:

curl -sL https://raw.githubusercontent.com/MichMich/MagicMirror/master/installers/raspberry.sh | bash

Once installed, edit the config.js file (using JSON format) to add your location for weather, link your Google Calendar, and customize the layout.

Step 3: Framing the Mirror

Cut your two-way acrylic to match the internal dimensions of your frame.
Place the acrylic into the frame (ensure the mirrored side faces outward).
Place your raw LCD panel directly behind the acrylic.
Use black construction paper or electrical tape to mask off any areas of the mirror that are not covered by the screen. This prevents light bleed.
Secure everything with brackets or strong tape, and mount the Raspberry Pi to the back of the monitor.

Wrapping Up

Plug in the monitor and the Raspberry Pi. Within a minute, the screen will boot into the MagicMirror interface, giving you a futuristic, floating heads-up display right in your hallway or bathroom.

The best part? You can always SSH back into the Pi later to add new modules like Spotify Now Playing, transit schedules, or even voice control! If you want to integrate some IoT flair later, check out Lesson 188: Introduction to MQTT.