RF74xxID is a passive RFID tag completely compatible with commonly used EM4100 tags. The tag uses all 74HCxx logic and can emulate nearly any standard read-only 125kHz EM4100 compatible tag.
Features include: passively powered via the EM-field, manually settable ID via DIP-switches, two selectable encoding types (Manchester and Biphase), selectable baud rate between 1, 2, 4, 8kbit and optional PLL coupled clock recovery.
For a complete build-log from preliminary tests to prototype and a full-featured version see: http://http://www.vagrearg.org/content/rf74xxid.
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Link to youtube video http://http://youtu.be/4S82drGnZuw demonstrating it at OSAA's entrance.
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Greetings Bertho
(this entry was also submitted through the contest's submission form)