Learn how to use Arduino to build RFID - and keyboard-based locks.To open the door, the user must first scan the correct label and then enter the correct password.After scanning the wrong label or entering the wrong password, the system will deny access.
Required Components for RFID and Keypad Based Door Lock using Arduino
Arduino Uno or any other Arduino
MFRC522 RFID Reader
SG90 Servo motor
4X4 Keypad or 4X3 Keypad
3 X LED’s (Red, Green, Blue)
3 X 220 ohm resistors
6 to 12V Power source (I have used 3 X 18650 cells)
Circuit Diagram and Explanation
RFID reader communicates with Arduino through SPI protocol, and different Arduino boards have different SPI pins.I described the connection between the RFID reader and the different Arduino boards in the table below.