Projects using this component
RFID Value Reading
Project that reads the serial number in Serial Monitor when the card or keychain is approached with RC522 RFID module. Teaches the basics of SPI communication and RFID reading.
ESP32 RFID RC522 Card Reader (with LCD)
In this project, we will connect the MFRC522-based RC522 RFID module to the ESP32 via SPI and read the card/tag UID. This forms the basis for applications such as door locks, membership systems, and access control. We will display the read UID on an LCD screen and provide an example of comparing it with an authorized card list. **WARNING:** The RC522 operates only at **3.3V**; supplying 5V will burn out the module!
ESP32 RFID Door Lock (RC522 + Servo + OLED + Buzzer + LED)
We’re building a smart door lock using an ESP32, an RC522 RFID module, an SG90 servo motor, an SSD1306 OLED display, an active buzzer, and 2 LEDs. When a card is scanned, its UID is compared to the list of authorized cards stored in the code—if authorized, the servo motor rotates to unlock the door (green LED + 2 short beeps), and the door automatically locks again after 5 seconds. For an unauthorized card, the red LED lights up, a warning is given with 3 rapid beeps, and the captured UID is dis