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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 21-40 of 67 products · 33 unavailable products hidden
TF-NOVA Line Laser LiDAR Sensor - 14m
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Instead of measuring just one dot, the TF-NOVA projects a wide 14° by 1° curtain of laser light to create a continuous line of detection. At 1 metre, that line covers 25cm x 1.7cm, helping automated machines spot thin or awkward obstacles that a single-point sensor may miss.Built on Pulse Time-of...
RGB Full Colour Backlight Display - 84mm x 45mm
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This diffused RGB backlight is a rigid acrylic light panel like the kind normally found behind LCD displays, but with a full-colour LED instead of a plain white backlight. The acrylic spreads the light from a single LED to give a near-uniform glow across the lit area.The flat rear side includes a...
Keybow Kit (3-key) Linear (quiet) keys with Rasberry Pi Zero WH
Keybow MINI is a 3-key version of our wildly-popular Keybow mini mechanical keyboard. Like its older sibling, Keybow MINI has RGB-illuminated, hot-swap, mechanical switches, and clear key caps. It's the perfect way to add a tiny macro pad to your desk, or to use as a little osu! controller. This...
Side-light Fiber Optic Tube - 5mm Diameter - 1 meter long
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This side-lighting fibre optic tube produces a glowing effect along its entire length when illuminated by a powerful LED. Unlike standard fibre optics that only emit light from the end, this tube allows light to escape along the sides, creating an even, neon-like glow. The tube is 5mm in diamete...
BlinkM - I2C Controlled RGB LED
BlinkM is a “Smart LED”, a networkable and programmable full-color RGB LED for hobbyists, industrial designers, prototypers, and experimenters. It is designed to allow the easy addition of dynamic indicators, displays, and lighting to existing or new projects. If you’ve used up all your microc...
Cubelets - Flashlight Cubelet
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The Flashlight Cubelet is an action block for the Cubelets modular robotics system. It emits a focused beam of white light from a powerful LED, with brightness proportional to its input value — high input means bright light, zero input means off. Cubelets are magnetic building blocks that snap t...
DFRobot 5V COB LED Strip Light - Yellow
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This compact COB light strip is a bright yellow 5V lighting module for decorative and embedded illumination projects. It uses 16 LED chips under silicone encapsulation to create a smooth, continuous luminous surface with minimal hotspots and shadowing.The low-voltage DC 5V input makes it practica...
SparkFun Buck Regulator Breakout - 3.3V (AP3429A)
The SparkFun 3.3V Buck Regulator Breakout features the AP3429A from Diodes Inc., a 2A step-down DC-DC converter with an input voltage range of 2.7V to 5.5V. This full-size, 1in. x 1in. version of our buck regulator boards is configured to provide a regulated 3.3V output (from a 3.9 to 5.5V input ...
Colourful Lamp Starter Kit For Micro:bit
Introducing the latest addition to our learning kits collection - the Colourful Lamp Starter Kit for Micro:bit! Made with high-quality bass wood, this kit is specially designed to provide a fun and engaging learning experience.Featuring an RGB module and IR receiver, this kit is compatible with b...
RGB LED Module
This RGB LED module gives your microcontroller project a simple way to add full-colour light. It uses a common-cathode through-hole RGB LED, with separate red, green and blue channels for mixing colours.Each colour channel has a built-in current-limiting resistor, helping protect the LED from bur...
Pimoroni Rainbow HAT for Android Things™ and Raspberry Pi
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The Rainbow HAT from Pimoroni has a buffet of sensors, inputs, and displays to explore Android Things™. Use it as a weather station, a clock, a timer or stopwatch, a mood light, or endless other things.Pimoroni collaborated with the Android Things™ team at Google to create this great add-on board...
Cubelets Curiosity Set
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The building blocks of better thinkers.Build, learn, and create more with the Cubelets Curiosity Set. Open a box of little robot blocks that will intrigue, fascinate, and inspire builders for hours on end. You’ve never seen building blocks like these. Cubelets make it easier than ever to explore ...
Learn to Solder Snowflake Christmas Tree DIY kit
Create your own festive LED decoration with this hands-on soldering kit. The Learn to Solder Snowflake Christmas Tree DIY Kit combines both through-hole and SMD components, giving you the opportunity to practice two different soldering techniques in one project. This kit produces a beautiful ill...
micro:bit Go (On-the-go Starter Bundle)
micro:bit is a pocket-sized microcontroller designed for kids and beginners learning how to program, letting them easily bring ideas into DIY digital games, interactive projects and robotics.micro:bit comes with a variety of on-board modules, including a 5x5 LED matrix (also supports light detect...
nOOds - Flexible LED Filament - 3V 300mm long - Red
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Our favorite food when hacking on code or electronics is a hot bowl of noodles - and around NYC these are often called 'noods'! What we've got here are flexible LED noodles, in different lengths and colors. All are not good for eatin' but they are good for cool lighting effectsThese are often see...
nOOds - Flexible LED Filament - 3V 300mm long - Blue
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Our favorite food when hacking on code or electronics is a hot bowl of noodles - and around NYC these are often called 'noods'! What we've got here are flexible LED noodles, in different lengths and colors. All are not good for eatin' but they are good for cool lighting effectsThese are often see...
Micro:bit Honeycomb Smart Wearable Programmable E-Textile
Upgrade your coding and E-Textile Project with the Keyestudio Micro:bit Honeycomb Ultimate Kit. This smart wearable kit allows you to write code and control various sensors and modules with the Micro:bit main board and Microsoft's online graphical programming platform, MakeCode. With easy-to-use ...
DFRobot Flexible RGB LCD Backlight Module
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This thin, flexible RGB light-emitting panel is designed for embedded systems, custom LCD backlights and diffuse indicator lighting. It uses separate red, green and blue channels to produce RGB colour output, with a common anode interface for driving from your own electronics.The bendable panel c...
Etched Glow-Through Keycap - Zener ESP Square Design
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When we saw the classic "Zener ESP Card" designed keyboard in the awesome CHVRCHES video for the song "How Not To Drown" (ft Robert Smith!) we were smitten. So goth! So esoteric! So we got a small number of these etched-through keycaps with the 5 designs: circle, cross, waves, square, a...
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5V COB LED Strip Light - Green
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This compact green COB light bar provides bright, even illumination for decorative lighting and small embedded projects. It uses 16 densely packed COB LEDs under silicone encapsulation to create a smooth luminous surface without the dotted look common on traditional LED strips.It runs from a simp...
