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Board Mount Hall Effect / Magnetic Sensor
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Price: $13.43
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Sparkfun Item #: SEN-16037 -

This is a cost-effective and highly functional hall-effect sensor. The Melexis 90217 is designed to be used with a bias magnet south facing the back (non-marked) side of the IC. With a single Hall plate, this sensor is immune to common rotary alignment problems. Very easy to interface with all microcontrollers. Features: Short circuit protection Rotary position gear tooth sensing ability No rotary orientation concerns High speed operation No chopper delay Zero speed detection On-chip 10 bit...

Hall-Effect Sensor - AH1815 (Non-Latching)
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Price: $2.00
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Sparkfun Item #: SEN-14709 -

The AH1815 is an integrated Hall-Effect non-latched sensor. That’s nice but what does it do? Holding a magnet near the sensor will cause the output pin to toggle. This makes for a robust presence sensor. A reed sensor also works nicely, but can be limited by the glass encapsulation and size. A Hall-Effect sensor is much smaller, but can handle less current than a reed switch. The AH1815 is a low-sensitivity, micro-power Omnipolar Hall effect switch IC, designed for portable and battery powered...

Hall-Effect Sensor - US1881 (Latching)
Price: $2.13
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Sparkfun Item #: COM-09312 -

The US1881 is an integrated Hall-Effect latched sensor. That's nice but what does it do? Holding a magnet near the sensor will cause the output pin to toggle. This makes for a robust presence sensor. A reed sensor also works nicely, but can be limited by the glass encapsulation and size. A Hall-Effect sensor is much smaller, but can handle less current than a reed switch. The device includes an on-chip Hall voltage generator for magnetic sensing, a comparator that amplifies the Hall voltage,...

LilyPad Reed Switch
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Price: $6.25
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Sparkfun Item #: DEV-13343 -

The LilyPad Reed Switch is a simple breakout for a reed switch that will make it easy to use in e-textiles circuits in exactly the same manner that you can currently use the LilyPad Button and Switch. In order to make it more durable for wearable use, we’ve used a different style of reed switch, which is insulated. This means that the same glass switch is encased in black plastic, making it much more difficult to break, but it works in exactly the same manner. A reed switch is a simple...

Magnetic Door Switch Set
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Price: $6.25
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Sparkfun Item #: COM-13247 -

This is the Magnetic Door Switch Set, a small reed switch assembly specifically designed to alert you when doors, drawers, or any other aperture opens. These types of switches are primarily used in home security systems. One half of the assembly set on a window or door frame and the other attached to the window or door itself. When the switch set is separated from each other the contact is broken and triggers an alarm. When each magnet piece comes within 20mm of each other they complete the...

Reed Switch
Price: $3.52
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Sparkfun Item #: COM-08642 -

This is a small device called a reed switch. When the device is exposed to a magnetic field, the two ferrous materials inside the switch pull together and the switch closes. When the magnetic field is removed, the reeds separate and the switch opens. This makes for a great non-contact switch. This switch can carry up to 1.2A. Documents: Datasheet Hookup Guide Application Note Videos ...

Reed Switch - Insulated
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Price: $3.25
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Sparkfun Item #: COM-10601 -

This is a small device called a reed switch. When the device is exposed to a magnetic field, the two ferrous materials inside the switch pull together and the switch closes. When the magnetic field is removed, the reeds separate and the switch opens. This makes for a great non-contact switch. This switch can carry up to 1A. This reed switch can be populated easily on a PCB and is encapsulated so it's more durable than glass reed switches. Documents: Datasheet (RS-01C) ...

SparkFun gator:control ProtoSnap
Price: $16.59
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Availability: Out of Stock
Sparkfun Item #: COM-14968 -

The SparkFun gator:control ProtoSnap is one of a series of gator-clippable accessories called gator:boards that have been created to directly interface with the micro:bit or to other micro controllers! The gator:control ProtoSnap offers a handful of ways to interact with projects you create using only gator-clip cables. Each little board on this ProtoSnap can be kept as a whole while on the board or broken apart for individual use! The gator:control ProtoSnap contains four boards in the main...

SparkFun HMC6343 Breakout
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Price: $258.40
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Sparkfun Item #: SEN-12916 -

The HMC6343 is a fully integrated high end electronic compass module that can compute and give you a heading direction that’s accurate within a couple degrees. It is tilt compensated and is calibrated to handle magnetic distortions. This breakout board allows for easy use of the HMC6343. All that is required is power and I2C connections to a microcontroller so that the module can receive commands and send data back to the user. The IC combines 3-axis magneto-resistive sensors and 3-axis MEMS...

SparkFun Triple Axis Magnetometer Breakout - MLX90393 (Qwiic)
Price: $26.50
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Sparkfun Item #: SEN-14571 -

It's time to start utilizing the superior magnetometer, and what better way than to throw it onto an easy-to-use breakout board? The SparkFun MLX90393 Magnetometer Breakout is a triple-axis magnetic sensor board capable of sensing very small fields, while still behaving as one would expect during saturation in larger fields (like a nearby magnet). The MLX90393 breakout can be used as a compass sensor but also works well as a non-contact controller, a flow meter with a magnetic impeller, or a...