ABSTRACT
Security
is a prime concern in our day-today life. Everyone wants to be as much secure
as possible. An electronic lock allows activation of an electric appliance only
on entering the correct password. This is also such an electronic locking
system in which PIC16F887A microcontroller plays the role of the central
processing unit. The microcontroller is interfaced with a 4×4 matrix keypad and a 16×2 LCD to form the user
interface.
The job of the microcontroller in
this project is to receive signals from the input device (keypad) and take
corresponding actions. Whenever any key is pressed on the keypad, the software
program in the microcontroller identifies the pressed key and accordingly turns on or turns
off the appliance. Simultaneously, it also displays a message on the LCD
screen. The system turns on the appliance on entering a four digit password set
by the user and displays message “password accepted”on LCD screen for 2 seconds
followed by the message “lock open”.
If the entered password
is not correct then the message “lock denied” should be displayed on LCD screen
for 2 seconds and followed by the message “lock closed”. The user can also
change the password by using corresponding key. Using this circuit any electrical
appliance can be made as password protected. It can also be used as an
electronic door lock by interfacing the output of the circuit with an
electrically actuated door lock.
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