EI Cheapo modules Part 19-Arduino NFC Shield

摘要

This shield, plus an Arduino module, could be used as the basis for a number of useful devices, for example, to unlock a door using an access card, to monitor the passage of stock or other items on a conveyor belt, to transmit business card information to customers' smartphones and so on. But before we explain how it works, we will explain how RFID and NFC work. NFC or Near-Field Communication is a set of protocols that enable two electronic devices to exchange data by bringing them within about 40mm of each other.