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AI Overview
To create a light-sensitive alarm with a micro:bit, you’ll typically need a way to read light level (built-in on micro:bit via the LED matrix, or an external LDR/photocell) and a way to output an alarm sound (built-in speaker on micro:bit v2, or an external buzzer/speaker).
Best all-in-one kits (easiest)
- Kitronik Inventor's Kit for the BBC micro:bit ($52.05) — includes an LDR (light sensor) plus components for building sensor-triggered projects.
- Kitronik Alarm Clock Kit with ZIP Halo HD for micro:bit ($88.85) — designed around alarm-style projects and explores light and sound.
- Micro:bit Explorer's Kit ($101.95) or Micro:bit Explorer's Kit without Micro:bit v2 ($79.35) — broader kits with lots of guided tutorials for sensors + outputs.
Light sensor add-on (if you want an external photocell)
- Octopus Analog Photocell Brick OBPhotocell ($2.40) — a simple analog LDR light sensor module you can use to trigger the alarm at a chosen brightness threshold.
Sound/alarm output (if you need louder sound than the on-board speaker)
- Kitronik MI:power Board V2 for BBC micro:bit ($17.20) — adds portable power and a built-in buzzer for alarm beeps.
- Micro:bit Expansion Board Adapter ($12.15) — a breakout-style adapter with a mini buzzer, handy for simple alarm builds.
- Electronics Starter Kit for Micro:bit ($61.70) — a general-purpose kit for wiring components to your micro:bit (useful if you’re assembling the alarm from parts rather than a single kit).
Do you have a micro:bit **v2** (with built-in speaker) or an older micro:bit (v1.x)?
Do you want to use the micro:bit’s **built-in light sensing** (simpler) or an **external LDR/photocell** (more flexible placement)?
Showing 61-80 of 100 products
ProtoSnap - LilyPad Development Board
The ProtoSnap series is a new way to prototype your project without a breadboard. Everything is wired together on a single board, which makes it easy to explore the possibilities of the components before snapping them apart and building them into your project. The ProtoSnap LilyPad Development...
Polymer Lithium Ion Battery - 40mAh
This is an extremely tiny and light weight battery based on the new Polymer Lithium Ion chemistry. This is the highest energy density currently in production. Each cells outputs a nominal 3.7V at 40mAh. This may sound like not so much power, but the cell is really tiny… like, about half an inch s...
Lithium Ion Battery - 110mAh
This is a very small, extremely light weight battery based on Lithium Ion chemistry. This is the highest energy density currently in production. Each cells outputs a nominal 3.7V at 110mAh! Comes terminated with a standard 2-pin JST-PH connector - 2mm spacing between pins. These batteries require...
Lithium Ion Battery - 850mAh
These are very slim, extremely light weight batteries based on Lithium Ion chemistry. Each cell outputs a nominal 3.7V at 850mAh! Comes terminated with a standard 2-pin JST-PH connector - 2mm spacing between pins. These batteries require special charging. Do not attempt to charge these with anyth...
SparkFun Picoboard Starter Kit
The SparkFun PicoBoard Starter Kit is your go-to source to begin learning everything about the SparkFun PicoBoard and the Scratch programming environment. This kit includes your very own PicoBoard, multiple pieces of hardware to get you started, and connecting components to get you hooked up. ...
Cubelets - Maximum Cubelet
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The Maximum Cubelet is a "Think" block in the Cubelets robot construction system. It accepts multiple input values and passes along only the greatest one, acting as a filter for sensor data. Use it to build robots that respond only when a sensor exceeds a threshold — for example, pairing it with ...
Circuit Sticker Add-on Sensors and Microcontroller Kit
Circuit Stickers are electronic stickers that you can use to build glowing, sensing, and interactive projects without any complicated equipment or programming skills. All you need is your imagination. And this is an add-on sticker kit for Circuit Sticker Starter kit, with sound se...
DIY Ornament Kit - 6cm Diameter - Perfect for Circuit Playground
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Have you put up with mainstream, uninspiring, low-tech tree ornaments for too long? This season why not deck the halls with codes of holly? This DIY Ornament Kit is just the right size (6 cm diameter) for a Circuit Playground Express, 500mAh LiPoly battery, and however you'd like to dress up ...
Chibitronics Effects stickers and stencil
Effects Stickers generate an effect to control your LEDs (or other output!). This pack contains four pre-programmed and craft-friendly effects: blink, fade, twinkle and heartbeatCircuit Stickers are electronic stickers that you can use to build glowing, sensing, and interactive projects without a...
Circuit Stickers LED MegaPack (30 stickers) - White
Brighten up your projects with Chibitronics MegaPack of LED circuit stickers. This pack includes 30 LED circuit stickers. Chibitronics Chibi Lights Circuit Stickers are a creative and fun way to learn electronics. Circuit stickers are LED circuits on peel-and-stick stickers. Building circuits ...
Circuit Stickers LED MegaPack (30 stickers) - Tropical - Pink, Orange Green
Brighten up your projects with Chibitronics MegaPack of LED circuit stickers. This pack includes 30 LED circuit stickers. Chibitronics Chibi Lights Circuit Stickers are a creative and fun way to learn electronics. Circuit stickers are LED circuits on peel-and-stick stickers. Building circuits ...
Circuit Stickers LED MegaPack (30 stickers) - Colour - Red, Yellow Blue
Brighten up your projects with Chibitronics MegaPack of LED circuit stickers. This pack includes 30 LED circuit stickers. Chibitronics Chibi Lights Circuit Stickers are a creative and fun way to learn electronics. Circuit stickers are LED circuits on peel-and-stick stickers. Building circuits ...
DIY Electro Dough Kit
Explore fun ways to learn and play with electronic dough. Make creations that buzz and light up.Perfect for family time at the kitchen table, Electro Dough is a fun combo of play and learning. A Tech Will Save Us bestseller, Electro Dough comes with a recipe to make your own conductive dough, and...
Adafruit CharliePlex LED Matrix Bonnet - 8x16 Cool White LEDs
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The Adafruit CharliePlex LED Matrix Bonnet features a 16×8 grid of cool white LEDs driven by the IS31FL3731 charlieplex driver over I2C. Simply plug it onto any Raspberry Pi with a 2×20 header for a bright, programmable 128-LED display — no soldering required. Each of the 128 LEDs supports indiv...
Adafruit CharliePlex LED Matrix Bonnet - 8x16 Yellow LEDs
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The Adafruit CharliePlex LED Matrix Bonnet features a 16×8 grid of yellow LEDs driven by the IS31FL3731 charlieplex driver over I2C. Simply plug it onto any Raspberry Pi with a 2×20 header for a bright, programmable 128-LED display — no soldering required. Each of the 128 LEDs supports individua...
Mover Kit
Get kids moving, building and coding with this toy that reacts to movement with light and can be coded in infinite ways! Ages: 8+ BUILD IT YOURSELF We believe children should use technology to create, not consume. Learn how the Mover Kit works by building it yourself. It’s as simple as making a L...
Adafruit CharliePlex LED Matrix Bonnet - 8x16 Blue LEDs
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The Adafruit CharliePlex LED Matrix Bonnet features a 16×8 grid of blue LEDs driven by the IS31FL3731 charlieplex driver over I2C. Simply plug it onto any Raspberry Pi with a 2×20 header for a bright, programmable 128-LED display — no soldering required. Each of the 128 LEDs supports individual ...
Adafruit CharliePlex LED Matrix Bonnet - 8x16 Green LEDs
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The Adafruit CharliePlex LED Matrix Bonnet features a 16×8 grid of green LEDs driven by the IS31FL3731 charlieplex driver over I2C. Simply plug it onto any Raspberry Pi with a 2×20 header for a bright, programmable 128-LED display — no soldering required. Each of the 128 LEDs supports individual...
Adafruit CharliePlex LED Matrix Bonnet - 8x16 Warm White LEDs
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The Adafruit CharliePlex LED Matrix Bonnet features a 16×8 grid of warm white LEDs driven by the IS31FL3731 charlieplex driver over I2C. Simply plug it onto any Raspberry Pi with a 2×20 header for a bright, programmable 128-LED display — no soldering required. Each of the 128 LEDs supports indiv...
UNIHIKER K10 AI Educational Tool for Beginner (Image Detection, Voice Recognition, TinyML)
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The UNIHIKER K10 is an AI learning device designed for education, serving as both a STEM AI kit and a TinyML education kit for teens. It integrates a 2.8-inch color screen, Wi-Fi, Bluetooth, a 2MP camera, microphone, speaker, RGB light, temperature sensor, humidity sensor, light sensor, an...
