Secure Electronic Lock using PIC 16f628a Microcontroller

The proposed system implements an electronic embedded lock that provides a great benefit over a traditional lock, which use the manual key. So if the key is lost or stolen then anybody could open the lock, whereas losing a long and complex password or getting it stolen is harder as compared to a traditional key. Further a combination of both, the manual key with computerized password makes the system more secure. A longer password will reduce the possibilities of getting the code broken and opening the lock. The system comprises of a keypad and HD44780 20x2 LCD along with a PIC16f628a microcontroller. The firmware controls these components in such a way that interaction with keypad is very easy and smooth. The LCD provides user with messages and notifications to inform about the current system state. User can perform operations such as opening and closing the lock, changing the current password in the microcontroller EEPROM and clearing a single digit while entering the password when wrong digit entered (back space). The proposed system’s firmware is developed using assembly language with MPLAB development environment. It tested and implemented in real hardware with proper functioning and bug free.