Introduction
Security is a prime concern in
our day-today life. Everyone wants to be as much secure as possible. The issue
of security is very paramount at home doors and safe. An access control for
doors forms vital link in a security chain. Therefore we intend to aid in
security at home by bringing in a security lock system that involves an
individual to enter the password before getting an access to some items, a
particular room or building.
Security lock system is basically
an electronic lock device. This system allows the user to unlock the device
with a 6 digit password. The password is entered by making use of a keypad. The
user can also always change his password to ensure better protection. The major components
include a keypad, buzzer, I/O board with LCD and LEDs, and the microcontroller P89V51RD2
board which belongs to the 8051 series of microcontrollers. .
Description
In this system, a 4x3 matrix keypad and a 16x2 LCD have been used here. Keypad and LCD are very
commonly used input & output devices, respectively. A 6 digit predefined
password is 123456. This password is stored in the system and the user is
allowed to change it any time. As the program starts, the menu is displayed
on LCD. The contents of the menu are listed as below:
1: UNLOCK 2: BELL 3: Set PIN 4: SETUP
To access it, the user needs to press the key as follow the number
specific for each function in the menu.
When the user presses 1, the system will request for enter
password to unlock. The keypad is scanned for pressed keys and corresponding
digits are identified. The passkey is displayed as ‘******’ on the LCD screen.
After the six digits are entered, they are compared with the pre-set password.
If all the six digits match with set password, LCD displays ‘Lock Open’, a
green led will light on and the buzzer will beep twice. If the password is
wrong, ‘Wrong Password’ is sent to be displayed on LCD, a red led will light on
and the buzzer will beep once. If more than four attempts are made with wrong
password to open the electronic lock, the system will gets locked, all the LEDs
will light on and the buzzer is beeps continuously to warning for 1 minutes.
When the user presses 2, the system will functions as a door bell
and the purpose is aim for a guest who visit the host . The LCD will display a
message ‘WELCOME, PLEASE WAITING FOR RESPONSE’ and the buzzer will beep twice
for function as bell.
When the user presses 3, the system will requests for enter
password to access the set PIN function.
If the password is match, the system will request for enter new PIN for
the system. This PIN will overwrite the preset PIN and store in the system.
When successful, the Green LED will blink and buzzer will beep 3 times. Else,
the red led will light on and the buzzer will beep once.
When the user presses 4, the system will requests for enter
password to access the Setup function. If the password is match, the system is
allow user to set the unlock time from 1 second to 9 second. Else, the red led
will light on and the buzzer will beep once.
Besides that, there is another hidden function is this Security
Lock System. This function is Emergency Alarm. To activate it, user have to
press key ‘*’ and follow by ‘#’, otherwise, the alarm will not activated. The
purpose of this function is allow user to use the alarm to attract others
attention. Once the alarm activated, all the LEDs will continues blinking and
the buzzer will give alert for a period.
Once the reset button of the controller board has pressed, all the
setting will return to the origin. Hence, the system will run with the preset
setting.
