Comments on: Ruby and RFID tags

By: Ben

Ben — Thu, 08 Dec 2011 01:43:35 +0000

My bad, I must’ve done something wrong…

By: Ben

Ben — Thu, 08 Dec 2011 00:31:59 +0000

Hey, this is a really cool demo. I just got my reader in the mail, but this doesn’t seem to work with touchatag reader anymore (tried with ruby 1.9.2 and 1.8.7 using rvm):

lib/nfc.rb:52:in `connect’: could not find NFC device (RuntimeError)
lib/nfc.rb:52:in `device’
lib/nfc.rb:28:in `deactivate_field’
lib/nfc.rb:96:in `find’

Device is plugged in and scanning codes just fine, and I confirmed I’m using libnfc 1.5. Code is identical to example.

By: Matt

Matt — Wed, 04 May 2011 21:03:19 +0000

I’m having the same exact issue as Jerik. I can’t find nfc-devel anywhere. I’m compiling libnfc from source rather than using mac ports. Aaron, how did you install the development version and get the necessary header files (libnfc.h)?

By: Aaron Patterson

Aaron Patterson — Mon, 31 Jan 2011 23:03:01 +0000

Jerik, make sure to install the development packages. Probably nfc-devel or something. That should have the header file included.

By: jerik

jerik — Mon, 31 Jan 2011 22:41:33 +0000

Hi,

tried to install “gem1.9.1 install nfc” but get always the error:
/usr/bin/ruby1.9.1 extconf.rb
checking for libnfc/libnfc.h in [...] no
libnfc is missing.

i have install libnfc and it is working fine. unfortunatly libnfc.h is not existing on my system. I checked out http://libnfc.googlecode.com/svn/trunk/ to retrieve it from there, but here it is neither. how do i solve this problem best?

Following libs are available:
/usr/lib/libnfc.a
/usr/lib/libnfc.la
/usr/lib/libnfc.so
/usr/lib/libnfc.so.0
/usr/lib/libnfc.so.0.0.0
/usr/lib/pkgconfig/libnfc.pc
/usr/local/lib/libnfc.a
/usr/local/lib/libnfc.la
/usr/local/lib/libnfc.so
/usr/local/lib/libnfc.so.0
/usr/local/lib/libnfc.so.0.0.0
/usr/local/lib/pkgconfig/libnfc.pc

can I use somehow another one?

fyi: running ubuntu linux, not osx.

cheers — jerik

By: Martin

Martin — Wed, 07 Apr 2010 14:20:28 +0000

I hate answering my own question (so I won’t) but the problem seems to have been resolved by installing Ruby 1.9 following (more or less) these instructions

http://hivelogic.com/articles/compiling-ruby-rubygems-and-rails-on-snow-leopard

It now reads NFC tags without complaining about the undefined constant – which may have been related to this perhaps?

http://stackoverflow.com/questions/2031980/what-are-the-uppercase-and-lowercase-rules-of-ruby-method-name

By: Martin

Martin — Wed, 07 Apr 2010 13:19:42 +0000

I installed MacPorts and libnfc (1.2.1) and then the gem but I get

./nfc.rb:4: uninitialized constant NFC (NameError)
from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require’
from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require’
from nfc.rb:2

when running your example on Mac OS X Leopard with this Ruby version

ruby 1.8.7 (2009-06-08 patchlevel 173) [universal-darwin10.0]

Any thoughts as to why this would be?

By: So long and thanks for all the 8D

So long and thanks for all the 8D — Thu, 04 Mar 2010 14:03:02 +0000

[...] around with an rfid reader which was made oh so easy thanks to the hard work of a developer called Aaron Patterson whose Ruby wrapper of the C libnfc library really helped me get started on my voyage of all things [...]

By: Delvis

Delvis — Fri, 20 Nov 2009 14:08:18 +0000

Okidata uses a similar looking chip to identify their cartridges. Would love to be able to read these chips and reset them.

By: Dr Nic

Dr Nic — Mon, 21 Sep 2009 21:17:27 +0000

Awesome, upgraded from 1.7 to 1.8 macports and its installing. Thanks.