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Beginning Arduino Programming by Brian Evans

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Project 10: RFID Reader

In this project we will use the Innovations ID-12 Radio Frequency Identification, or RFID reader to read unique identification numbers from cards, key fobs, stickers, and even little capsules. These tags have circuitry in them that when in proximity to a reader, powers up and broadcasts their unique 12-digit hexadecimal ID number. The reader transmits this data through its serial TX pin in 16-byte packets, one byte at a time. Because these tags are each unique, we can use them to inventory the beer in our fridge or to let only our cats in through our cat door.

The Innovations ID-12 is a common RFID reader that uses 125kHz tags and sends its data over a serial connection at a 9600 bps data rate. Other readers in the company's ...

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