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Gravity: 27 Pcs Sensor Kit for Arduino
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Price: $224.33
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DFRobot Item #: KIT0011 -

If you want to start playing with sensors, this sensor kit for arduino will be the perfect choice for you to get started. It comes with bundle of the most popular DFRobot sensors such as light sensors, gas sensors, sound sensors, touch sensors, distance sensor, accelerometer and lots more which gives unlimited possibility to sense the physical world on your embedded devices. The wiki for these sensors and devices makes it easy to start learning. So save by purchasing them together and start...

Gravity: Digital Magnetic Sensor
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Price: $7.90
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DFRobot Item #: DFR0033 -

what's the best way to detect the magnet? Use anther magnet. But it's not sensitive enough. You have to feel it by youself.Right. This magnetic sensor knows whether there is a magnetic object nearby or not. And it correctly tells you through ditigal output.See below picture for a quick demo! |Features| Wide voltage range from 3.3V to 5V Standard assembling structure (Times-of-5mm Center distance between two 3mm mounting holes) Easily recognitive interfaces of sensors ("A" for analog and "D"...

Hall Effect Sensor - US1881
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Price: $1.53
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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...

Hall Sensor - A3144E (5pcs pack)
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Price: $2.65
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Elecrow Item #: EL-SPM31441S -

This is a Hall-effect switches sensor that integrated circuits with tighter magnetic specifications, it can work at +150�C temperatures Environment.and is more stable with both temperature and supply voltage changes. It has a voltage regulator, reverse battery protection diode,quadratic Hall-voltage generator, temperature compensation circuitry, small signal amplifier,schmitt trigger, and an open-collector output. Features Superior Temp. Stability for Automotive or Industrial Applications 4.5...

Hall-Effect Sensor - AH1815 (Non-Latching)
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Price: $1.61
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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...

Magnetic Door Switch Set
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Price: $4.74
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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 (5pcs pack)
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Price: $3.18
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Elecrow Item #: EL-SPM02102S -

    The reed switch is an electrical switch operated by an applied magnetic field. 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. It consists of a pair of contacts on ferrous metal reeds in a hermetically sealed glass envelope. An example of a reed switch's application is to...

SparkFun HMC6343 Breakout
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Price: $241.01
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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...

SparkFun Triple Axis Magnetometer Breakout - MAG3110
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Price: $24.03
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Sparkfun Item #: SEN-12670 -

"Freescale’s MAG3110 is a small, low-power, digital 3-axis magnetometer. The device can be used in conjunction with a 3-axis accelerometer to produce orientation independent accurate compass heading information. It features a standard I2C serial interface output and smart embedded functions. It’s also a tiny QFN package which isn’t very easy to play with so here is our easy to use breakout board. This board breaks out all of the pins for the MAG3110 to a standard 0.1" header...

SparkFun Triple Axis Magnetometer Breakout - MLX90393 (Qwiic)
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Price: $25.29
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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 (like the Earth’s magnetic field), 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...