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
