Learn how to implement RFID readers with your Arduino
See how to save variables in the Arduino EEPROM
Design the framework for an Arduino-based RFID access system
Radio-frequency identification (RFID) is a wireless system that uses electromagnetic fields to transfer data from one object to another, without the two objects touching. You can build an Arduino that reads common RFID tags and cards to create access systems and to control digital outputs. You may have used an RFID card before, such as an access card that you use to unlock a door or a public transport card that you hold in front of a reader on the bus. Figure 18-1 shows some examples of RFID tags and cards.
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