Arduino NFC

Maker Faire NY

September 22, 2013

Presented by Don Coleman / @doncoleman

What is NFC?

What can I do with NFC?

Mobile Payments
Sharing Data between Phones
Contact Info on Conference Badge
Pair with Bluetooth Device
Mass Transit Card
Smart Poster
Hack Stuff

Devices

Tag Types

Common properties

UID
Type
Technology
Capacity
Is Locked
Is Lockable

Each tag type

Stores data in different binary format
Has different security features
Has different ways to read and write

NDEF

NFC Data Exchange Format

NDEF Message

NDEF Record

TNF (Type Name Format)
Type
Payload
Record Id

TNF - Type Name Format

Indicates the structure of the value of the type field

TNF Constants

Empty
Well Known
Mime Media
External

Type

Identifier describing the type of the Payload

Must follow rules implied by TNF

Payload

Data for the user application

Empty Record

TNF = Empty

Text Record

hello, world

TNF = Well Known
Type = T
Payload = 2 + en + hello, world

URI Record

http://arduino.cc

TNF = Well Known
Type = U
Payload = 0x3 + arduino.cc

Mime Media Record

{ "message": "hello, world" }

TNF = Mime Media
Type = application/json
Payload = { "message": "hello, world" }

Helper Methods

message.addEmptyRecord();
message.addTextRecord("hello, world");
message.addUriRecord("http://arduino.cc");
message.addMimeMediaRecord(
"text/json", { "message": "hello, world" }
);

Quick Review...

NDEF Message

One or more NDEF Records

NDEF Record

Contains a payload of data

Information describing the payload

Adafruit NFC Shield

http://www.adafruit.com/products/789

Seeed Studio NFC Shield

http://www.seeedstudio.com/depot/nfc-shield-v20-p-1370.html

PN532 Library

https://github.com/Seeed-Studio/PN532 Based on Adafruit's Library and modified by Yihui Xiong to support both I2C and SPI

NDEF Library

for Arduino

https://github.com/don/NDEF

I2C

SPI

Setup

Write Tag

Read Tag

DEMO

https://gist.github.com/don/6665981

Memory

you will run out

Peer to Peer

Logical Link Control Protocol (LLCP)

Simple NDEF Exchange Protocol (SNEP)

https://github.com/Seeed-Shield/NFC_Shield_DEV

Android Apps for NFC

Read Tags PhoneGap NFC Reader

Format and Unformat Mifare Classic Tags NXP Tag Writer

View Raw Data on Tag NFC Tag Info

Technical Specs

http://www.nfc-forum.org/specs/spec_license

Thank You

Don Coleman

@doncoleman

don@chariotsolutions.com

http://don.github.io/slides/

Arduino NFC by Don Coleman is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
Based on a work at https://github.com/don/slides/tree/gh-pages/2013-09-22-arduino-nfc.