Summary of PIC Microcontroller Based Electronic Lock
This article describes a microcontroller-based digital door lock system using the PIC16F877A microcontroller. It secures access by requiring users to enter a password via a 4x3 matrix keypad, displayed on a 16x2 LCD. The password is stored in EEPROM and can be changed by authorized users. When the correct password is entered, a relay activates (simulated by an LED on PORTA bit 0) to unlock the door. The system highlights modular programming and user convenience in password management, providing a reliable electronic access control solution.
Parts used in the Microcontroller Based Digital Lock for Doors:
- PIC16F877A Microcontroller
- 4x3 Matrix Keypad
- 16x2 LCD Display
- Relay (simulated by LED on PORTA bit 0)
- EEPROM (on-chip memory storage)
Security is a prime concern in our day-today life. Everyone wants to be as much secure as possible. An access control for doors forms a vital link in a security chain. The microcontroller based digital lock for Doors is an access control system that allows only authorized persons to access a restricted area.
An electronic lock or digital lock is a device which has an electronic control assembly attached to it. They are provided with an access control system. This system allows the user to unlock the device with a password. The password is entered by making use of a keypad.
The user can also set his password to ensure better protection. The major components include a Keypad, LCD and the controller PIC16F877A. This article describes the making of an electronic code lock using the 16F877A microcontroller.
The system is fully controlled by the 8 bit microcontroller 16F877A which has a 8Kbytes 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 with the password stored in the memory then the relay gets on and so that the door is opened.
The code is built in a modular style to allow a user to find ways to modify project. In start the D Lock programs loads with a default code of “2345” format is *2345# which can be enter to unlock the door, the code cam be change by entering the master code in the format *23455#new 4 digit code. In this program i only display the result on LCD and lock will be placed at PORTA bit 0 where i put led for simulation.
A 4×3 matrix keypad and a 16×2 LCD have been used here. Keypad and LCD are very commonly used input & output devices, respectively. The password is stored in the system EEPROM.
For more detail: PIC Microcontroller Based Electronic Lock
