Microcontroller Based Efficient Door Lock System

This thesis submitted in partial fulfillment of the requirements for the degree of Bachelor of Science in Computer Science and Engineering of East West University, Dhaka, Bangladesh.This project deals with door lock security system to restrict unauthorized access.It is all performed by a servo controlled by a microcontroller.On the outside, there will be a keypad to enter password by the user. Inside, there will be two switches to lock or unlock the door and to reset the system. The servo is attached with the lock inside the door. As locking and unlocking is possible from both sides, it allows entry and exit of a person without any assist from any side. Unlike ordinary systems available around us, this gives user freedom to use any level of complex password entries for a single constant default password.On the outside of the door, user can enter a large number of random entries including the correct password in the input to make the password look very difficult to others. And wrong password trails will put the system in hold for a while