Here's a Soviet themed launch-code box, complete with missile switch covered toggles, a Feather with red 14-segment display for the countdown timer, and stress-inducing piezo buzzer. Use it for an escape room, prop, or wedding proposal. Your players, or potential spouse-to-be, will need to enter the correct five-switch sequence to defuse the device before all is lost. (Note: this project is a harmless prop, not an actual bomb.)

Build your own Overwatch Lucio Blaster! Use Arduino, NeoPixels, MP3 Music Maker, Audio FX board, and a 20 watt amplifier to drive the impressive blasting sound effects, lights, and music from this Overwatch prop gun! In part three, turn prototype circuit into a permanent one, 3D print and assemble the final gun.

Perfect for magic tricks, escape rooms, and slightly unorthodox birthday parties -- this seemingly innocuous, sealed deck of cards contains a secret. When the puzzle is solved, the deck is thrown in the air, tossed to a friend, or dropped a short distance. Freefall is detected by the Circuit Playground embedded within, and it beeps a secret Morse code message.

This simple-yet-effective method of building a mystery box uses only a solenoid, a reed switch, and batteries to create a locked box that can be opened using a carefully positioned magnetic key.

Build your own Overwatch Lucio Blaster! Use Arduino, NeoPixels, MP3 Music Maker, Audio FX board, and a 20 watt amplifier to drive the impressive blasting sound effects, lights, and music from this Overwatch prop gun! In part two, combine the electronics into an integrated system.

Build your own Overwatch Lucio Blaster! Use Arduino, NeoPixels, MP3 Music Maker, Audio FX board, and a 20 watt amplifier to drive the impressive blasting sound effects, lights, and music from this Overwatch prop gun! In part one, design and build the individual components.

The NeoPixels can change color based on accelerometer tilt, making it a terrific angle-based brush. The addition of a battery pack for power and a potentiometer for adjusting brightness make this a perfect light paintbrush!

Animating NeoPixels can be challenging when using purely coding methods. This technique allows you to create traditional animation-style exposure sheets to control the color, position, and timing of your NeoPixel animation on the Circuit Playground.

Here's a guide to quickly and easily adding exciting, colorful lighting effects to your props. Using the accelerometer, speaker, and NeoPixel LEDs built into the Circuit Playground, you can have sounds and lights for idle animations, along with two different effects triggered by waving and striking your foam sword, cosplay blaster, magic wand, and more.

Build a creepy, glowing test tube display... if you dare. A Feather microcontroller makes the UV LEDs shine to create dazzling effects in the fluorescent pigment-and-water filled test tubes. Easy-to-assemble black iron pipe forms the base of this labware set. The perfect prop for your own haunted house or creepy laboratory.

Make your own PZ-1 MIDI pizza box DJ controller using a Circuit Playground, which speaks MIDI directly to your software, such as Traktor, Mixxx, and others. With a stencil and conductive paint you'll create a delicious controller layout.

Long, random passwords are the most secure, but can be difficult to remember and tricky to type. Build this Circuit Playground Password Vault to remember and enter them for you! Store up to ten passwords and enter them into a computer over USB at the push of a button. You'll even create a unique unlock sequence so your passwords stay secure, and build a rugged 3D printed case to take it on the go.

The Circuit Playground's NeoPixels are used as indicators for day of the week and class periods, color coded per subject. You can enter a complex schedule that varies daily in the sketch, and then click the buttons on your Circuit Playground to find out which class is next.

Trade Chewbacca's famous grunts and growls in this talking electronic toy mask for some sounds of your own choosing. Using the Audio FX Board, it's easy to modify the lovable Wookie to sound like Pee Wee Herman, a joyful vlogger, or any other sound you like.

Bring some delightful 8-bit flair to your Christmas tree (or any other holiday foliage) with this Super Mario star power-up, the Starduino! 3D print the custom-designed model, made to lovingly nestle a 16 LED NeoPixel ring and Arduino Gemma in its belly. Then, program the GEMMA with a super fancy blinky pattern of goodness and light.