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NFC (Near Field Communications) is a way for two devices very close to each other to communicate. Sort of like a very short range bluetooth that doesn't require authentication. It is an extension of RFID, so anything you can do with RFID you can do with NFC.
Because it can read and write tags, you can always just use this for RFID-tag projects. We carry a few different tags that work great with this chip. It can also work with any other NFC/RFID Type 1 thru 4 tag (and of course all the other NXP MiFare type tags)
The Adafruit shield was designed by RF engineers using the best test equipment to create a layout and antenna with 10cm (4 inch) range, the maximum range possible using the 13.56MHz technology. You can easily attach the shield behind a plastic plate with standoffs and still read cards through a (non-metal) barrier.
This shield is designed to use I2C or SPI communication protocols. I2C is the default, as it uses fewer pins: analog 4 and 5 are used for I2C (of course you can still connect other I2C devices to the bus). Digital #2 is used for "interrupt" notification. This means you don't have to sit there and 'poll' the chip to ask if a target tag has been found, the pin will pull low when a card, phone, etc is within range. You can adjust which pin is used if you need to keep digital #2 for something else. It is also easy to change the shield over to SPI where you can use any 4 digital pins by shorting two solder jumpers on the top of the PCB. Compatible with any "classic" Arduino - NG, Diecimilla, Duemilanove, UNO - as well as Mega R3 or later. For using the I2C interface with Mega R2 or earlier, two wires must be soldered as the I2C pins are in a different location on earlier Megas.
Comes with: the Adafruit NFC/RFID PN532 shield including a tuned 13.56MHz stripline antenna, 36-pin 0.1" header for attaching the shield to an Arduino.
2.1" (53.3mm) x 4.7" (117.7mm) and 0.425" (1.1mm) thick.
This board/chip uses I2C 7-bit address 0x48
You can download the library from github!
Antenna design document MiFare Card format
Schematic (we'll have files up soon)
Check out RFID/NFC project page for documentation, libraries, and other support
For more details about NFC/RFID and this chip we suggest the following fantastic resources:
RFID selection guide- a lot of details about RFID in general
Nokia's Introduction to NFC - a lot of details about NFC in general
NXP S50 chip datasheet, the chip inside MiFare classic tags
NXP PN532 Datasheet
NXP PN532 User Manual
NXP PN532 App Note
Using PN532 with libnfc
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