This document describes a password based door locking security system presented by four students. The system uses a microcontroller, keypad, LCD display, buzzer, DC motor, and other components. It allows a user to enter a password to open the door for security and can be used to secure doors, lockers, and other areas. The system was tested and provides advantages like automatic door opening and indication of unauthorized entry while being cost efficient.

1. PASSWORD BASED
DOOR LOCKING
SECURITY SYSTEM
PRESENTED BY:
Anuj Kumar Gupta (04270102811)
Prachi Sharma (04570102811)
Surabhi (07770102811)
Sahil Pandey (07970102811)

2. CONTENT
 OBJECTIVE
 INTRODUCTION
 COMPONENTS USED
 CIRCUIT DIAGRAM
 SOFTWARE DESCRIPTION
 ADVANTAGES
 DISADVANTAGES
 FINAL PROJECT
 FUTURE SCOPE
 CONCLUSION
 REFERENCES

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.

5. BLOCK DIAGRAM
8052
MICROCONTROLLER
LCD
BUZZER
POWER SUPPLY
KEYPAD MOTOR

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.

7. COMPONENTS USED
QUANTITY REFERENCES VALUE
3 Capacitors
1 C1 1000u
1 C2 100u
1 C3 10u
3 Integrated Circuits
1 U1 AT89S52
1 U2 7805
1 U3 ULN2003A
Transistors
1 Q1 BC548

8. QUANTITY REFERENCES VALUE
2 Diodes
2 D1, D2 1N4007
8 Miscellaneous
3 B 1, GATE, RL 1 12 V
1 BUZ 1 BUZZER
1 CONTRAST 100
1 LCD 1 LM016L
1 TR 1 TRAN-2P3S
1 X 1 CRYSTAL

9. MAJOR
COMPONENT
S USED

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

16. CIRCUIT DIAGRAM

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.

20. FINAL PROJECT

21. Project being initiated

22. Step 1: The project is connected to the main supply

23. Step 2: The “Door Security System” will be
displayed

24. Step 3: Enter the password

25. Step 4: Confirm the password

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