3. OBJECTIVE
Increase the security level to prevent an
unauthorized unlocking of the door.
Give the flexibility to the user to change or reset the
password in case the user forgets that combination.
Lock the door by using password.
To give user more secure yet cost-efficient way of
door locking system.
4. INTRODUCTION
Since the main intension of this project is to design
a security Door locks system. In order to fulfill this
application there are few steps that has been
performed i.e.
Designing the power supply for the entire circuitry.
Selection of microcontroller that suits our
application.
Selection Key pad.
Selection of DC motor.
Selection of buzzer according to the requirement.
Complete studies of all the above points are useful
to develop this project.
6. DESCRIPTION OF BLOCK
DIAGRAM
Block Diagram consist of following blocks:
• Keypad: It is an input device that helps to enter a
code to open the door. This block gives the entered
code signals to the microcontroller.
• Buzzer and LCD: These are the final indicating
devices for displaying the information and alarming.
• DC motor: It moves the door opens and closes the
door.
• Relay: It drives this motor by receiving control signals
from the microcontroller.
10. MICROCONTROLLER -
AT89S52
4.0V to 5.5V Operating Range
256 x 8-bit Internal RAM
32 Programmable I/O Lines
Three 16-bit Timer/Counters
Eight Interrupt Sources
Low-power Idle and Power-down Modes
11. LCD
• LCD is a dot matrix liquid display crystal that
displays alphanumeric, Kana(Japanese)
characters and symbols.
• Internal refresh is provided.
• All the functions required for dot matrix LCD drive
are internally provided.
Built-in oscillator circuit.
12. BUZZER
• Operates using piezoelectric effect.
• Sound emitter may be extremely low or ear
piercing.
• Driven by low voltages and currents.
• Elements are made from crystals, such as quartz
or Rochelle salts
13. DC MOTOR
It is a machine which converts electrical energy
into mechanical energy
The input of a DC motor is current/voltage and its
output is torque (speed)
Motor uses 9V battery, connected to the switching
relay
14. VOLTAGE REGULATOR-LM7805
Three-terminal positive regulator
Used with external components to obtain
adjustable voltages and currents
Used for thermal overload protection
Output current to 1.5 A
Output voltage to 5V
15. ULN2003A
Consists of seven NPN Darlington pairs
Includes output flyback diodes
Application is to drive relays, lamp and LED
displays or stepper motors
500 mA rated collector current (single output)
50 V output
17. SOFTWARE DESCRIPTION
PROTEUS SOFTWARE is used for the simulation
of circuit
CODING USED: Embedded C Language with the
implementation of Keil Software
USB programmer Avrupro + was used to burn
the code in microcontroller
Progisp Flash tool
18. ADVANTAGES
• No keys to be lost, stolen or occupied.
• Can be locked using keypad.
• Automatic door opening .
• Gives an indication for unauthorized entry.
• Totally cost efficient.
19. DISADVANTAGES
• Currently if the personal identification number
is somehow forgotten the system could not be
accessed.
• Powered by electricity may not function
properly in the case of a power failure.
26. Step 5: Now lock is activated enter the correct
password to open the door, with the display “LOCK
OPEN”
27. TESTING:
In case wrong password is entered for 3 trials, buzzer
will start, with the display “SORRY NO MORE TRIALS”
28. FUTURE SCOPE
•We can send this data to a remote location
using mobile or internet.
•We can add fingerprint sensor so entry will be
allowed for the authorized person using their
fingerprints.
•We can add fire, wind and LPG sensors so that
in case of accident, the doors will automatically
open.
29. CONCLUSION
PASSWORD BASED DOOR LOCKIING
SECURITY SYSTEM is used in the places where
we need more security. It can also used to secure
lockers and other protective doors. The system
comprises a number keypad and the keypads are
connected to the 8 bit microcontroller AT89S52.
The microcontroller continuously monitor 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 it they are
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 who don’t know the password.
30. REFERENCES
Book References:
8051 Reference Manual, TICO Institute of Embedded
Technology
Fundamentals of Embedded Software: Where C and
Assembly Meet by Lewis Daniel
Web References:
www.atmel.com
www.electronicshub.org
www.keil.com
http://www.edgefxkits.com/remote-password-
operated-load-control-by-android-applications
http://www.edgefxkits.com/password-based-circuit-
breaker