An Introduction to RFID. The RC522 RFID module based on MFRC522… | by Ruthu S Sanketh | AUTONOMOUS ROBOTICS | Medium
![rfid - Is it possible to connect multiple sensors to raspberry pi? How do I expand on the standard gpio pins? - Raspberry Pi Stack Exchange rfid - Is it possible to connect multiple sensors to raspberry pi? How do I expand on the standard gpio pins? - Raspberry Pi Stack Exchange](https://i.stack.imgur.com/FDWBS.jpg)
rfid - Is it possible to connect multiple sensors to raspberry pi? How do I expand on the standard gpio pins? - Raspberry Pi Stack Exchange
![raspberry pi - RC522 has other pins than shown in all the tutorials - Electrical Engineering Stack Exchange raspberry pi - RC522 has other pins than shown in all the tutorials - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/S4GHU.jpg)