I am currently building a simple audio book player for my kids. One part of are RFID chips for every audio book. An RFID-RF522 reader detects them and plays the corresponding audio book.
Connecting the RFID-RC522 board was more difficult than I first thought as most tutorials on the Internet have an incorrect pinout for current Raspberries. Those that are correct lack the interrupt line which causes a high power consumtion.
With this schematic the connection is simple and compact:
It allows to use interrupts which enables to write low power applications. You can find the schematics at fritzing.org.
Thank you very much for these information.
It worked fine for my Raspi 3B!