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This is a simple magnetic stripe emulator. Basically you can stick this into a magnetic card reader and emulate any stripe data you'd like.
Thin piece of ferrous metal (about 1" x 4") Spool of enamel-covered solid-conductor copper wire (you can get this in a set at Radio Shack) Electrical Tape Arduino
1. Get your metal shim and wrap about 2/3 of it in electrical tape. This prevents the sharp edges from cutting through the enamel on the wire you're going to ...
I've attached the code. Magstripes use Biphase Mark Code to encode the data. Here is more information on how this works http://en.wikipedia.org/wiki/Biphase_mark_code.
A couple of other similar projects: this project helped inspire mine: http://www.soniktech.com/sdmce.php this is another similar project: http://www.instructables.com/id/Magnetic-stripe-card-spoofer/
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