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Magnetic Door Switch Set
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Price: $4.81
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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...

Hall Effect Sensor - US1881
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Price: $1.55
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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...

SparkFun Triple Axis Magnetometer Breakout - MAG3110
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Price: $24.38
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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...

Advance Sensor Set for Arduino
Price: $128.85
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DFRobot Item #: KIT0011 -

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

Digital Magnetic Sensor
Price: $6.90
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DFRobot Item #: DFR0033 -

Digital Magnetic Sensor Introduction The magnetic sensor can be used on magnetic (magnet) detection, detection range up to about 3cm (detection range and the strength of the magnetic).  Specifications Voltage: +3.3-5V Pin Definition :1 - Output 2 - Power 3 - to Weight: 5g Documents

SparkFun HMC6343 Breakout
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Price: $244.53
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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...