DESIGN AND CONSTRUCTION OF A COMPUTER BASED CONTROL OF ELECTRICAL APPLIANCES

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INTRODUCTION

This project presents the design and construction of a computer based program used to control office appliance. It is based on a Graphic user interface (GUI) programming language (Visual Basic 6.0), Parallel Port Interactive Mode, Opto-Coupler Isolation of the computer from the appliance to prevent damage to the system should a fault develop in the appliance. The implementation was based on the interaction of the computer with electronic appliance via the 25 Pin Centronics Parallel Port Cable.

TABLE OF CONTENT

Title Page- - - - - - - - - - i

Dedication - - - - - - - - - ii

Acknowledgement - - - - - - - - iii

Abstract - - - - - - - - - - iv

List of Figures- - - - - - - - - v

List of Table - - - - - - - - - vi

Table of Content - - - - - - - - vii

CHAPTER ONE

INTRODUCTION

1.2 Objective of the Project - - - - - - 1

1.3 Justification of the Project - - - - - 2

1.4 The Scope of the Project- - - - - - 2

1.5 Project Report Organization - - - - - 3

CHAPTER TWO

REVIEW OF RELATED LITERATURE

2.3.1 The Hardware- - - - - - - - 4

2.3.2 The Software - - - - - - - - 7

2.3.3 Parallel Port Basics - - - - - - - 15

2.4 Opto-Electronic Component - - - - - 28

2.5 The Relay- - - - - - - - - 34

CHAPTER THREE

METHODOLOGY

3.1 Design Approach - - - - - - - 37

3.2 Software Development - - - - - - 37

3.2.1 Out Putting Data to the Parallel Port - - - 38

3.2.2 Reading Data from the Parallel Port - - - 40

CHAPTER FOUR

ANALYSIS AND DESIGN

CHAPTER FIVE

SYSTEM IMPLEMENTATION AND TESTING

5.1 Functional Test - - - - - - - - 51

CHAPTER SIX

CONCLUSION AND RECOMMENDATION

5.1 Conclusion - - - - - - &a

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DESIGN AND CONSTRUCTION OF A COMPUTER BASED CONTROL OF ELECTRICAL APPLIANCES

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