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Reed switches are normally-open magnetic switches that close when a magnet is nearby—great for door/drawer sensors, rotation sensing, and simple on/off magnetic triggers.
Bare reed switches (for custom wiring)
- Reed Switch ($4.55) — basic glass-style reed switch for breadboards/prototyping.
- Reed Switch - Insulated ($7.50) — encapsulated/insulated for a more durable build than a bare glass reed.
Modules / breakouts (easier microcontroller hookup)
- Reed Switch Module ($4.35) — simple module with digital output (DO) style hookup.
- Standard mini Reed Switch Module ($7.80) — compact module form factor.
- LilyPad Reed Switch ($14.85) — designed for e-textiles/LilyPad sewing-style projects.
Door/window style magnetic contact sets (pre-housed)
- Magnetic contact switch (door sensor) ($5.05) — ABS housing with separate magnet piece; ideal for doors/windows/drawers.
- Magnetic Door Switch Set ($9.55) — reed switch assembly specifically aimed at door/drawer open detection.
- Magnetic Switch ($7.90) — housed sensor + magnet; triggers at roughly ~1 cm proximity.
Showing 21-35 of 35 products
Weather Meter Kit
This Weather Meter Kit provides the three core sensors for a DIY weather station: an anemometer (wind speed), a wind vane (wind direction), and a rain gauge. All three sensors use passive magnetic reed switches rather than active electronics, making them simple to interface with any microcontroll...
Elecrow 37-in-1 Sensors Module Kit for Arduino
This 37-in-1 sensor kit provides a comprehensive collection of the most common and useful electronic modules for Arduino. Each module outputs signals directly when connected to an Arduino board, making it an ideal starter set for beginners learning about sensors, inputs, and outputs. Key Feature...
Creative Kids Arduino Coding Kit
ACTIVITY KIT DETAILSThe Little Bird Arduino Creative Kids Kit includes 24 tutorials that teach you both Arduino and Electronics.Each kit and tutorial has been handcrafted by Maddy herself.Kit includes: Little Bird Uno R3 + USB Cable Breadboard Jumper Wires LEDs (Multicolour RGB and single colours...
Micro:bit Explorer's Kit
Note: This is the new version of our Micro:Bit 24 Bit kit and has been updated for the new Micro:Bit V2! The Little Bird Micro:bit Explorer's Kit includes more than 24 tutorials that teach you both how to use the micro:bit with various sensors and electronics with real-world applications. Acces...
Micro:bit Explorer's Kit without Micro:bit v2
The Little Bird Micro:bit Explorer's Kit includes more than 24 tutorials that teach you both how to use the micro:bit with various sensors and electronics with real-world applications. Access to the tutorials are available on our website for free, forever! There is a speaker and microphone,...
Micro:bit Education Kit
Dive into the world of coding, electronics, and robotics with our comprehensive Micro:Bit Education Kit. Perfect for educators, students, and makers alike, this kit includes everything you need to explore and create innovative projects including lots of tutorials! What's Included: 1 x...
Magnet Square - 0.25
These are small rare earth magnets - 0.25" cubed. Composed of Neodymium/Iron/Boron (NdFeB), these magnets are curiously strong and make for a great way to attach tools to a metal workbench, hold small children to a fridge, and as a trigger for reed switches. Activates the reed switch (shown belo...
Magnet Square - 0.125
These are very small rare earth magnets - 0.125" cubed. Composed of Neodymium/Iron/Boron (NdFeB), these magnets are curiously strong and make for a great way to attach tools to a metal workbench, hold small children to a fridge, and as a trigger for reed switches. Don’t let the photo fool you - t...
Wind Vane
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This wind vane is used to indicate the direction from which the wind is blowing. Inside the vane are eight switches, each paired with a unique resistor, allowing a microcontroller to read direction based on the vane’s position.As the vane rotates, a magnet closes the reed switches. In some positi...
ScoutMakes DRV5032 Digital Hall Effect Sensor Breakout
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Add magnetic sensing to your project with this breakout built around the Texas Instruments DRV5032 digital Hall effect sensor. Its digital output changes when the magnetic flux density threshold is crossed, making it useful for detecting magnets, position, lids, doors, rotations and other simple ...
Little Bird 45 in 1 sensor kit for Arduino
This kit brings together a wide range of sensor and interface modules for Arduino projects, experiments and classroom learning. It includes input sensors, output modules, switching modules, power modules and useful building blocks for trying common electronics ideas.Use the modules to explore lig...
The Art of Electronics: The X Chapters - by Horowitz Hill
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Wow did you hear about that new sequel coming out? No, no, not The Matrix 4 – it's The Art of Electronics - X Chapters! More delicious, practical electronic advice from the masters, Paul Horowitz and Winfield Hill. The Art of Electronics: The X Chapters expands on topics introduced in the be...
Magnet Ring - 3/16
These are small rare earth magnets - 3/16" rings. Composed of Neodymium/Iron/Boron (NdFeB), these magnets are curiously strong and make for a great way to attach tools to a metal workbench, hold small children to a fridge, and as a trigger for reed switches. This one small ring can easily hold a ...
Spare part (outdoor unit) for Professional Wireless Weather Station
This spare outdoor unit set is designed for use with professional wireless weather stations, providing the essential sensors needed to accurately monitor local weather conditions. Ideal as a replacement set or for custom weather station projects, it delivers reliable measurements of wind, rainfal...
5V SPST DIL Reed Relay
This small, lightweight 5V SPST reed relay is designed for PCB mounting in a standard DIL (Dual In-Line) package. It switches up to 1A DC with a low 0.1W power consumption, making it suitable for low-power switching applications in sensor circuits, security systems, and instrumentation. Key Feat...
