Security System With User Changeable Password

Abstract

This project presents a smart security system using Arduino UNO with a user-changeable password feature for 
enhanced access control and security. The system utilizes a keypad for password entry, an OLED display for showing 
status messages and user instructions, and a solenoid lock for automatic door control. When the correct password is 
entered, the system unlocks the door automatically, providing secure and convenient access. If an incorrect password 
is entered, a buzzer and red LED are activated to alert the user and indicate unauthorized access attempts. 
A key feature of this system is the ability to change the password at any time using the keypad, allowing greater 
flexibility and personalized security. The updated password is securely stored in EEPROM memory, ensuring data 
retention even after power loss. The system is designed to be low cost, reliable, user friendly, and easy to implement. 
Due to its compact design and efficient operation, it is suitable for applications in homes, offices, laboratories, and 
small organizations where secure access management is required.