MFRC5C522 is a combined reader and writer for RFID tags that comply with ISO/IEC 14443 like A/MIFARE and NTAG. The commonly available inexpensive boards have an SPI interface, we will make it talk with Explore M3 in this tutorial. - See more at: http://exploreembedded.com/wiki/MIFARE_MFRC522_RFID_with_Explore_M3