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Gravity: 27 Pcs Sensor Kit for Arduino
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Price: $129.29
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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: $5.00
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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 Sensor - A3144E (5pcs pack)
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...

Reed Switch (5pcs pack)
Price: $2.47
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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...