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Class 05: Identity

Slides:  Download 05-identity-rfid-smaller.pdf

NFC Demo

We have Adafruit PN532 NFC breakout boards on hand. You have two options of talking to these boards: From your mbed board, or from Linux or OS X directly, via a USB-TTL cable. (For archival purposes, we've run this for Arduino boards in the past - here are the Instructions of connecting to Boarduino if you are interested).

Connecting to mbed KL25Z

Hardware Connections

Pn532-mbed.jpg

Directly connect the SPI pins of mbed to PN532 breakout board.

  • D13 (PTD1) <====> SCK (blue wire)
  • D12 (PTD3) <====> MISO (yellow wire)
  • D11 (PTD2) <====> MOSI (green wire)
  • D10 (PTD0) <====> SSEL (orange wire)

Remember to also connect 3.3V (red wire) and GND (black wire). Do NOT connect 5V.

Software

Get the example code from mbed forum: http://mbed.org/teams/Interactive-Device-Design/code/readMifare/

The default behavior is a card reader. After you compile, download and flash your mbed, you should see something like the following:

Hello!
Found chip PN532 with Firmware ver. 1.6
Waiting for an ISO14443A Card ...

 

If you tag a card, you'll see output like this:

Found an ISO14443A card
  UID Length: 4 bytes  UID Value: 0xBA 0xA4 0x90 0x23

Seems to be a Mifare Classic card (4 byte UID)
Trying to authenticate block 4 with default KEYA value
Sector 1 (Blocks 4..7) has been authenticated
Reading Block 4:
	00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................

Connect to OS X/Linux

It's also possible to directly connect your board to Linux or OSX using an FTDI Serial-to-USB cable. We have these cables in stock in the Invention Lab. Instructions are at:http://learn.adafruit.com/adafruit-pn532-rfid-nfc/libnfc We don't have pointers to connecting these to Windows.