rfid
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$7.50PN532 is NFC RFID (Radio Frequency Identification) module. This module is built around NXP PN532 IC. NXP PN532 IC is very popular in NFC applications.
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$5.00The RC522 is a 13.56MHz RFID module that is based on the MFRC522 controller from NXP semiconductors. The module can supports I2C, SPI and UART and normally is shipped with a RFID card and key fob. It is commonly used in attendance systems and other person/object identification applications.