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This sensor is essentially a reed...
This sensor is essentially a reed switch, encased in an ABS plastic shell. Normally the reed is 'open' (no connection between the two wires).
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This sensor is essentially a reed switch, encased in an ABS plastic shell. Normally the reed is 'open' (no connection between the two wires). The other half is a magnet. When the magnet is less than 13mm (0.5") away, the reed switch closes. They're often used to detect when a door or drawer is open, which is why they have mounting tabs and screws. You can also pick up some double-sided foam tape from a hardware store to mount these, that works well without needing screws.
• Normally open reed switch
• ABS enclosure
• Rated current: 100 mA max
• Rated voltage: 200 VDC max
• Distance: 15mm max
• Box size (each side): 29mm x 14mm x 9mm / 1.1" x 0.6" x 0.4"
• Cable Length: 305mm ± 12mm / 12" ± 0.5"
• Weight (per side): 5.4g
Netduino driver and Netduino sample. This sample shows how to use an interrupt handler to respond to a button press or a magnetic contact switch closing.
Switch Type: NC (normally closed type), circuit is connected when magnet closes to the switch
Mounting Nethod: SMD (by screws or double-sided tapes)
Voltage: 12V DC
Rated Power: 10W
Maximum working current: 0.5Amp
Actuation distance:18mm ± 6mm
Material: Nd magnetic
Housing Material: ABS
Wire lead: 22 Awg, 300mm long
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