Near field communication

Draft

Introduction

According to Wikipedia (4/2015), Near field communication (NFC) is somewhat similar to Bluetooth, but works at much smaller distances (< 10 to 20 cm). NFC is much slower than Bluetooth, but requires less energy . NFC is compatible with existing passive RFID (13.56 MHz ISO/IEC 18000-3) infrastructures. E.g. in order to play with this technology, you should have a cellphone, then download an end-user app for writing something on a cheap RFID tag.

NFC has been invented in 2002 by NXP Semiconductors and Sony and in 2010, Google launched the Nexus S, the first Android NFC phone. In 2011, Google launches Google wallet. Most 2014/15 cellphones include NFC support, but Apple only for iPhone 6. The most typical use case are contactless payment systems.

There are two main devices which translate to possible modes of operation:

• Active chips. These can work in either target (see below), initiator (read or write) or peer to peer mode.
• Passive target chips, also called "tags" (allows to transfer data to an initiator).

Active NFC devices can read data from tags. Some tags are rewritable. Some are crypted. There are standards, but target chips also can be custom encoded.

Uses

Some general use cases ares:

• Wireless payment
• Bootstrapping other connections
• Social networking
• Intenty and keys
• Gaming, (e.g. virtual treasure hunts or the crytped Amiibos)

In education, NFC tags can be used in a similar way as QR tags.

Tools

End user software for Android devices

• NFX Tag writer
• NFC Tools
• Tag Info lite

... there are many more

End user computer / phone

• NFC Developer allows to create on the computer. The result is then put into QR tag that you can scan with the app.

Indexes

• Top 10 Best NFC Tag Apps for Android

NFC tags

There exist many brands. Comsumer chips can be bought in electronic shops and online retailers.

• Which NFC Chip ? (comparison of RapidNFC products)

If you plan to store longer URLs or procedures, make sure that it has enough memory, at least 500 bytes, more is better.

Samsung TecTiles

(just an example, we don't particularly endorse this one)

TecTiles are Samsung's stickers with an embedded NFC chip and are sold by packs of five. A free TecTile app allow to "program" these with series of predefined tags that will interact with your phone, its browsers, etc. See the kinds of tags you can make in the FAQ.

Links

Introductions

• Near field communication
• List of NFC-enabled mobile devices

Technology Tutorials

• NFC Near Field Communication Tutorial, by Ian Poole, radio-electronics.com. Very detailed, technical.

End user tutorials

• How to encode NFC tags (tutorial for the NFX tag writer app).

Programming

• Get started with NFC Android, May 2012.

In education

• How can I use NFC to engage my students? JISC Inform,
• How to use Near Field Communication to engage your foreign students by Simon Wardman, 5 September 2013, Jisc blog.