Microcontroller Based Digital Code Lock: Project Report

Project Report on Microcontroller Based Digital Code Lock

Security is a prime concern in our day-to-day life. Everyone wants to be as much secure as possible. Access control for doors forms a vital link in a security chain. The microcontroller-based Door locker is an access control system that allows only authorized persons to access a restricted area. The system is fully controlled by the 8-bit microcontroller AT89C2051 which has 2Kbytes of ROM for the program memory. The password is stored in the EPROM so that we can change it at any time. The system has a Keypad by which the password can be entered through it. When the entered password equals the password stored in the memory then the relay gets on so that the door is opened. If we entered the wrong password more than three times then the Alarm is switched on. When we go inside and come back then the microcontroller will sense the person using the Laser light, the microcontroller will automatically open the door for you.

Contents of the Project Report

  • Project Description
  • Block Diagram with Explanation
  • Circuit Diagram with Explanation and Power Supply Diagram
  • Flow Chart
  • Programs Execution
  • Component Details
  • Application and Future
A password-Based Door Security System using a Microcontroller is used in the places where we need more security. It can also be used to secure lockers and other protective doors. The system comprises a number keypad and the keypads are connected to the 8-bit microcontroller AT89C2051. This is one of the popular Microcontroller. It has only 20 pins and there are 15 input/output lines. 

The microcontroller has a program memory of 2 Kilobytes. The microcontroller continuously monitors the keypad and if somebody enters the password it will check the entered password with the password which was stored in the memory and if they are the same then the microcontroller will switch on the corresponding device. The system will allow the person who knows the password and it will not allow those who don’t know the password and the system will also show the persons who try to break the protective barrier.