【Arduino, Raspberry Pi】RFID-RC522

Arduino using a RFID RC522 - YouTube
Arduinoで近距離無線通信 RFID-RC522 NFC by ボクにもわかる地上デジタル
GitHub - miguelbalboa/rfid: Arduino RFID Library for MFRC522

【Raspberry Pi】
RASPMER: How to use RFID-RC522 on Raspbian
GitHub - lthiery/SPI-Py: Hardware SPI as a C Extension for Python
GitHub - mxgxw/MFRC522-python: A small class to interface with the NFC reader Module MFRC522

 => /boot/config.txt -> device_tree=on ハマった場所。