Identity: Barcodes, Fiducial Markers, RFID
We have Adafruit PN532 NFC breakout boards on hand. You have two options of talking to these boards: From Linux or OS X directly, via a USB-TTL cable, or through your Boarduino.
Connect to Arduino
We'll mainly follow these instructions - http://learn.adafruit.com/adafruit-pn532-rfid-nfc but with modifications for the Boarduino.
Insert the Boarduino, NXP 4050 level shifter chip, and the PN532 breakout board into a breadboard.
Boarduino <-> 4050 chip
Pin numbering: Pin 1 is top left near notch, 8 bottom left, 9 bottom right, 16 top right.
- Boarduino digital pin 2 is connected to 4050 pin 9 (orange wire)
- Boarduino digital pin 3 is connected to 4050 pin 11 (yellow wire)
- Boarduino digital pin 4 is connected to 4050 pin 14 (green wire)
On the breakout board
- 5V is connected to the Arduino 5V pin (red wire)
- SCK is connected to 4050 pin 10 (orange wire)
- MISO is connected to Boarduino pin 5 (blue wire)
- MOSI is connected to 4050 pin 12 (yellow wire)
- SSEL is connected to 4050 pin 15 (green wire)
- GND connects to Arduino ground (black wire)
Also connect 4050 pin #1 to 3.3V on breakout (red wire) and pin #8 to ground on the Boarduino.
Get the PN532 SPI library from GitHub: https://github.com/adafruit/Adafruit-PN532
Rename the folder - replace dash with underscore (Adafruit_PN532) Place the Adafruit_PN532 library folder your <arduinosketchfolder>/libraries/ folder. You may need to create the libraries subfolder if its your first library. Restart the IDE.
You should now be able to select File > Examples > Adafruit_NFCShield_I2C > readMifare sketch. Upload the sketch to your Arduino with the shield plugged in, open the serial monitor.
You should see something like the following:
Hello! Found chip PN532 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. Instructions are at: http://learn.adafruit.com/adafruit-pn532-rfid-nfc/libnfc
Connect to Windows
Sorry, you're on your own.