Bluetooth Digital Lock

Abstract

The goal of this project is to develop a software version of Digital Door Lock using 8051 Microcontroller in first module and a working model of Bluetooth Digital Lock using Arduino Uno in its second module. This advancement in technology facilitates the security mechanism in an efficient manner and can be used to replace the existing door locks. In our software implementation in the first module of the project, the microcontroller based digital lock is an access control system that allows only authorized persons to access any restricted division. The major components include a keypad, LCD, DC motor and the micro controller AT89C51 which belongs to the 8051 series of micro controllers. The system is fully controlled by the 8 bit microcontroller AT89C51 which has a 4 KB of ROM for the program memory. The electronic control assembly allows the system to unlock and lock the device with a password. A four digit predefined password needs to be specified by the user. A 4x3 matrix keypad and a 16x2 LCD have been used here to set the password which is stored in the microcontroller’s internal memory. While unlocking and locking, if the entered password from keypad matches with the stored password, then the lock opens and closes respectively and a message is displayed on LCD.