DESIGN AND CONSTRUCTION OF PASSWORD HOME SECURITY SYSTEM

ABSTRACT
The necessity of a low cost electronic home security system designed in co-ordination with other
security measures is always there in our society to reduce the risk of home intrusion. Keeping
this problem in mind, we are working on a project on automatic password based door lock
system. We want to utilize the electronic technology to build an integrated and fully customized
home security system at a reasonable cost. We hope this project will be useful in keeping thieves,
dacoits and other sort of dangers at bay.
By using this system we can unlock the door by using pre-decided password, increase the
security level to prevent an unauthorized unlocking. In case the user forgets the combination of
password this system give the flexibility to the user to change or reset the password. This
automatic password based lock system will give user more secure yet cost-efficient way of
locking-unlocking system.
Firstly the user combination will be compared with prerecorded password stored in the system
memory. Our system will allow the user to go for certain number of wrong combinations before
the system will be temporarily disabled. But if user combination matches with the password, the
door will be unlocked. The same password can be used to lock the door. This system will give
the user an option to reset his own password if he wants.
TABLE OF CONTENT
CERTIFICATION
DEDICATION
v
ACKNOWLEGDEMENT
ABSTRACT
TABLE OF CONTENT
LIST OF FIGURES
LIST OF TABLES
CHAPTER ONE
INTRODUCTION
1.1 Preamble
1.2Aim
1.3Scope of Project
1.4 History
1.5 Objective
1.6 Project Applications
CHAPTER TWO
LITERATURE REVIEW
2.1Background
2.2 Improvement on Existing Works
2.2.1 Volumes
2.2.2 Embedded design
2.2.3 Programs
2.3Code Lock
2.4Operational Amplifier (OP Amps) and Comparator
2.4.1Characteristics of Ideal Operational Amplifier
vi
2.5Transistor
2.6Passive Components
CHAPTER THREE
METHODOLOGY
3.1Introduction
3.2 The Main Component of the Project
3.3 Power Supply Unit
3.4 LM78xx Series Voltage Regulato
3.5Design and Construction
3.51Results and Analysis
3.52Block Diagram Description
3.5.3 Microcontroller
3.5.4 Relay
3.5.5 AT93C46 IC
3.56Functional Description
4.0CHAPTER FOUR
4.1 System Design, Development and Implementation
4.1 Introduction
4.2 The Block Diagram of the Project
4.3 The Function of the Flow Chart Diagram
4.4 Software
vii
5.0CHAPTER FIVE
5.1Results and Discussion
5.2Conclusion and Recommendation
5.3Future Development
Glossary
REFERENCE
Appendix A
Programme Code for the Microcontroller
Appendix B
Machine Code for the Microcontroller
viii
LIST OF FIGURES
FIGURE TITLE PAGE
Figure 2.1 : Block Diagram Relating the Memory and Port
Figure 2.2: Op Amp/Comparator Schematic Representation
Figure 2.3 Passive Components
Figure 3.1: Password Based Door Locking System Circuit Diagram using 8051
Figure 3.2 Bridge rectifier 20
Figure 3.3Basic diagram of power supply unit
Figure 3.4 Main block diagram of the system
Figure 3.5 LCD ( Liquid Crystal Display)
Figure 3.6Block diagram of microcontroller
Figure 3.7Circuit diagram of PIC
Figure 3.8 The flow chart
ix
LIST OF TABLES
TABLE TITLE PAGE
3.1 Function of microcontroller port 3 Pins
3.2 Function of various pins interface
3.3 Function of AT93C46 IC Pins
5.1 Cost breakdown Code

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APA

Ochuwa, E. (2019). DESIGN AND CONSTRUCTION OF PASSWORD HOME SECURITY SYSTEM. Afribary. Retrieved from https://track.afribary.com/works/design-and-construction-of-password-homesecurity-system

MLA 8th

Ochuwa, Enoch "DESIGN AND CONSTRUCTION OF PASSWORD HOME SECURITY SYSTEM" Afribary. Afribary, 16 Aug. 2019, https://track.afribary.com/works/design-and-construction-of-password-homesecurity-system. Accessed 04 Feb. 2026.

MLA7

Ochuwa, Enoch . "DESIGN AND CONSTRUCTION OF PASSWORD HOME SECURITY SYSTEM". Afribary, Afribary, 16 Aug. 2019. Web. 04 Feb. 2026. < https://track.afribary.com/works/design-and-construction-of-password-homesecurity-system >.

Chicago

Ochuwa, Enoch . "DESIGN AND CONSTRUCTION OF PASSWORD HOME SECURITY SYSTEM" Afribary (2019). Accessed February 04, 2026. https://track.afribary.com/works/design-and-construction-of-password-homesecurity-system

DESIGN AND CONSTRUCTION OF PASSWORD HOME SECURITY SYSTEM

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