Arduino-Based Electronic Safe with Password Authentication Using a Matrix Keypad and Servo Motor

Security and access control are essential requirements for protecting personal belongings and confidential materials. Conventional mechanical locks may be vulnerable to unauthorized duplication or physical manipulation, motivating the development of electronic locking systems. This paper presents the design and implementation of an Arduino-based electronic safe with password authentication using a matrix keypad and a servo motor. The system utilizes an Arduino Uno microcontroller to process user input, compare the entered password with a predefined password, and control the locking mechanism. A matrix keypad provides the user interface for password entry, while a servo motor operates the locking mechanism according to the authentication result. Access is granted when the entered password matches the stored password; otherwise, the system denies access. The hardware implementation integrates the microcontroller, keypad interface, servo motor, and a custom-designed printed circuit board (PCB). The proposed system offers a simple, low-cost, and compact approach to electronic access control, making it suitable for small-scale security applications. The project demonstrates the practical application of embedded systems, password-based authentication, and electromechanical actuation in the development of an electronic locking mechanism.