Sunday, 14 December 2014
EMBEDDED PASSWORD BASED SECURITY DOOR LOCK SYSTEM USING I2C PROTOCOL
EMBEDDED PASSWORD BASED SECURITY DOOR LOCK
SYSTEM USING I2C PROTOCOL
ABSTRACT:
Security
is prime concern in our day-to-day life. Every one wants to be as much as secure as to be possible. An access control
systems forms a vital link in a security chain. The micro controller based
digital lock presented here is an access control system that allows
only authorized persons to access a restricted area. This system is best suitable for corporate offices,
ATMs and home security.
The
system comprises a small electronic unit with a numeric keypad, which is fixed out side the entry door to control a
solenoid-operated lock with the help of a stepper
motor. When an authorized person enters predetermined user ID and password via the keypad, the stepper motor is operated for a
limited time to unlatch the solenoid-operated
lock so the door can be open. At the end of preset delay, the stepper motor is operated in reverse direction and the door gets
locked again.
When
the code has been incorrectly entered three times in a row, the code lock will switch to block mode. This function thwarts any
attempt by ‘hackers’ to quickly try a
large number of codes in a sequence. If the user forgets his password, the code
lock can be accessed by a unique 10 digit
administrator password. The secret code can be
changed any time after entering the current code (Master code).
A buzzer
is provided for audio acknowledgment of the key impression. Whenever a key is
pressed on the numeric keypad, the system acknowledges the impression by a short beep sound. This buzzer is driven
by an NPN transistor.
This project uses regulated
5V, 500mA power supply. 7805 three
terminal voltage regulator is used for
voltage regulation. Bridge type full wave rectifier is used to rectify the ac
out put of secondary of 230/12V step down transformer.
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