Design And Construction Of A Security Code Lock

Project and Seminar Material For Electrical Electronics Engineering EEE

Project and Seminar Material For Electrical Electronics Engineering EEE


Due to frequent unexpected access to restricted areas being encountered in our societies nowadays, from enemies or unwanted visitors, it has caused a lot of gatalities, inconveniences, data loss and serious business disruption, and other related damages. The security code lock came into play in order to solve these problems.

Security code lock is a development of hardware base equipment security in the sense that, it makes use of “secret code” as mechanical, electrical or electronic device. The hardware is extremely easy to install with its high tech design, robust casing and stylish stainless finish, ensuring that it fits in most environment, from exclusive offices to stores and industrial premises.

The advantages of this technology are that, its great features allows us to introduce high-grade security into systems without requiring major changes in procurement directions. It minimizes impact on users substantial investment in both hardware and software system.

Details about security code lock and its operation are treated in the subsequent chapters as enumerated below

Chapter one talks about brief introduction of security code lock and the occurrence that usher their effective use, which eventually made them popular.

Chapter two deals on literature review of the security code lock, which is the overview of the equipment. This involves the history, inventions, researches, various contributions by engineers and scientist.

Chapter three discusses the characteristics of each component used with their symbols

Chapter four discuses its construction, mode of operation, included are the block, circuit and flow chart diagram. Finally conclusion and recommendation falls in chapter five.

Table Of Contents

Preliminary Page(s)

  • Title
  • Declaration
  • Approval
  • Dedication
  • Acknowledgement
  • Abstract
  • Table of Content

Chapter One

1.0 Introduction

Chapter Two

2.0 Literature Review

  • 2.1 History

Chapter Three

3.0 Components Used And Functions

  • 3.1 Microcontroller
  • 3.11 Programming The Peripherial Interphase Controller (Pic) 16F873A
  • 3.12 Rom Instruction Memory
  • 3.13 Ram Memory
  • 3.14 Crystal Oscillator
  • 3.15 Relay
  • 3.16 Resistor
  • 3.17 Voltage Regulator
  • 3.18 Transistors
  • 3.19 Push Button
  • 3.20 Soft Touch Switch (Keypad)
  • 3.21 LEDS

Chapter Four

4.0 Construction/Operation

  • 4.1 Construction
  • 4.11 Circuit Diagram
  • 4.12 Block Diagram Of A Code Lock Circuit
  • 4.13 The Operation
  • 4.14 Flow Chart Of The Code Lock
  • 4.15 Programming The Microcontroller
  • 4.16 Procedure For Programming Device
  • 4.17 The Program For The Flow Chart

Chapter Five

5.0 Conclusion And Recommendation

  • 5.10 Conclusion
  • 5.11 Recommendation
  • References

Chapter One

1.0 Introduction

A security code lock is a flexible and versatile lock control system. It makes use of ‘code lock’ as electrical, electronic or mechanical derive. It is a simple and secure method of locking equipment without having the need to directly operate the equipment by press contact. It removes the need for keys or buttons, taking away the hassle and cost of copying or replacing lost ones.

The new Encyclopedia Britannica, 1768 defines code lock as electrical/electronic/ mechanical device for securing an equipment so that it cannot be opened except by series of manipulations that can be carried out only by a person knowing the secret or code. The security code lock is a practical and code locking solution, ideal for commercial or residential premises, minimizing the risk of unwanted visitors gaining access to a restricted area-without impairing the dialing activities of tenants of staff.

With this hardware circuit we can lock up to one or more devices by a safeguard password chosen by the user to protect the system and as well unlock the system by entering an access code when the equipment is needed for use. An entry code reader transmits entered access codes to the controller. The controller compares the entered access to pre stored access codes and actuates the lock in response to the entered access code.

In case of power failure, the device will not create any problems, no operation or re-programming will be needed as well as all command are automatically memorized by the system and when the power is re-established the device restore immediately the last status of lock or unlock that had been commended.

Areas Of Application

  1. Door with electric lock.
  2. Garage door.
  3. House lights.
  4. Water pumps.
  5. Electric Sunshade.
  6. Block the engine of your car or your motor cycle at the steal case and much more.

Chapter Five

5.0 Conclusion And Recommendation

5.10 Conclusion

During the execution of this project, we observed that it is a simple and secure method of locking any equipment without having to resort to the use of keys or press-buttons, and therefore removing the cost of replacement. This risk of unwanted visitors gaining access to a restricted area without impairing the dailing activities of the residents has been also regulated with the invention of this project.

5.11 Recommendation

Following the above conclusion, we then recommend this project for the majority of doors, computer system, house appliances water pumps, Garage door, money safe in the bank, installed in store room, conference rooms, offices and even residents since it provides users with a secure, convenient and cost effective way of locking. We further suggest that the department should allocate projects at the beginning of the semester to enable the student’s source for fund and other things that can help them carryout their projects.

Design And Construction Of A Security Code Lock

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