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Specification
Brand : Adafruit
BulletPoint1 : Most popular NFC chip
BulletPoint2 : Read and write to tags and cards and communicate with phones
BulletPoint3 : No embedded NFC work required
BulletPoint4 : nboard power LED, 3.3V regulator and an FTDI header so you can plug in an FTDI friend
BulletPoint5 : Package Content : 2 x Water Sensor Moisture Sensor
Color : Speed Measuring Sensor Module
ConnectorType : Screw
CurrentRating : 15 milliamps
CustomerPackageType : Standard Packaging
ExternallyAssignedProductIdentifier1 : 720189972928
ExternallyAssignedProductIdentifier2 : 0720189972928
ExternallyAssignedProductIdentifier3 : 00700724295538
IncludedComponents : 5 x Speed Measuring Sensor, 5 xEncoders, 1 x 15pin Female to Male Dupont Wire, 1 x 15Pin Female to Female Dupont Wire
ItemName : Adafruit PN532 NFC/RFID controller breakout board
ItemPackageDimensions_Height : 1.27 centimeters
ItemPackageDimensions_Length : 15.24 centimeters
ItemPackageDimensions_Width : 10.16 centimeters
ItemPackageQuantity : 1
ItemTypeKeyword : sensor-blocks
Manufacturer : Adafruit
Material : Copper
ModelNumber : 364
MountingType : plug-in
NumberOfItems : 1
PartNumber : Adafruit:364
ProductDescription : Parameters：
Working voltage: 3.3V-5V
Output mode: digital signal (pulse signal)
Detection method: infrared rays interrupted
Detection signal: high level when an obstacle is detected, low level output when there is no obstacle or beyond the detection range
LED: Two-way Status indicator, the ray interruption indicator is off, and the ray continuity indicator is on

Wiring:
1.+5
+5 is the positive input port of the power supply, which can be connected to a voltage of 3.3V~5V
2.GND
GND is the negative input port of the power supply
3.OUT
OUT is the signal output port, which is connected to the I/O port of the MCU, generally connected to external interrupts

Package included:
5 x Speed Measuring Sensor
5 x Encoders
1 x 15pin Female to Male Dupont Wire
1 x 15Pin Female to Female Dupont Wire
ProductSiteLaunchDate : 2014-05-26T20:55:46.193Z
Style : Speed Measuring Sensor Module
SupplierDeclaredDgHzRegulation : not_applicable
UnitCount : 1
Voltage : 3.3 volts