[dorkbotdc-blabber] SmarTrip Apparel

[Thomas Edwards]

[IAAEE...]

Cubic (http://cubic.com/cts/) was an integrator for SmarTrip.  They
use the Cubic GO CARD, a ISO/IEC 14443 Type B card that has a 13.56
MHz operating frequency, 10 cm operating distance (under optimal
circumstances), and transmits data at about 106 kbps:

http://tinyurl.com/hackgo

More info on ISO 14443 Type B cards here:

http://www.atmel.com/dyn/resources/prod_documents/doc2056.pdf

If you are seeking info on building an appropriate antenna for ISO
14443 Type B RFID chips, check out this application note on the ST
CRX14:

http://dev.emcelettronica.com/AppNote/ST/AN1806

Or this article which is deeper on theory but has less practical examples:

http://www.melexis.com/prodfiles/0003929_AN90121_7.pdf

-T



On Tue, Jul 22, 2008 at 8:12 AM, Andrew Q Righter
<andrew at i11industries.com> wrote:

> Unfortunately you can not just randomly coil magnet wire and attach it to
> the uController, you have to tune the coil to make sure that it is set to
> the resonance frequency of your chip. (As Lorne had mentioned, you are
> correct btw. hehe) In this case, I think it's either 125kHz or 13.56mHz, I
> haven't played with the ST card too much but these are my guesses as they
> are either a vicinity or proximity style card.