TABLE OF CONTENTS…………………………………………………..vii

CHAPTER ONE: INTRODUCTION…………………………..………….1
1.1 BACKGROUND OF STUDY…………………………………………...1
1.2 AIMS AND OBJECTIVE………………………………………………..2
1.3 RELEVANCE OF THE STUDY…………………………………………3
1.4 SCOPE OF THE PROJECT………………………………………………4
1.5 STATEMENT OF THE PROBLEM……………………………………...5
1.6 IMPORTANCE OF THE STUDY…………………………………………7
viii
1.7 PROJECT REPORT ORGANIZATION…………………...........................8

CHAPTER TWO: LITERARTURE REVIEW…………………..……………9
2.1 HISTORICAL BACKGROUND………………………...............................9
2.2 DISCRIPTION OF COMPONENTS USED ………………………………13
2.3 CONTACTOR………………………………………………………… …13
2.3.1 OPERATING PRINCIPLES………………….………………………….15
2.3.2 APPLICATIONS…………………………………….…………………...17
2.4 RESISTORS………………………………………………………………..18
2.4.1a USES OF RESISTORS………………………………………………….19
2.4.1b TYPES OF RESISTORS………………………………………………...19
2.4.1c FIXED RESISTORS……………………………………………………..20
2.4.1d VARIABLE RESISTORS………………………………………………..20
2.5 CHARACTERISTICS OF RESISTORS…………………………………….21
2.6 CAPACITORS……………………………………………………………….21
2.6a TYPES OF CAPACITORS ……………………………………… …...........22
ix
2.6b USES AND APPLICATION OF CAPACITORS…………………………..22
2.7 TRANSFORMERS…………………………………………………………...23
2.7a USES OF TRANSFORMER………………………………………………...25
2.8 RELAYS………………………………………………………………………25
2.8a TYPES OF RELAYS………………………………………………………..26
2.8b FACTORS TO CONSIDER BEFORE SELECTING A RELAY…………..27
2.8c APPLICATION OF RELAY………………………………………………..28.
2.9 DIODES………………………………………………………………………28
2.9a USES OF DIODES………………………………………………………….29
2.10 CRYSTAL OSCILLATORS…………….......………………………………29
2.10a TYPES OF CRYSTAL OSCILLATORS...………………………………...29
2.10b TERMS ASSOCITED WITH CRYSTAL OSICLLATORS………...…….30
2.1Oc APPLICATION AND USES OFF CRYSTAL OSCILLATORS...………31
2.11 REGULATORS………………………………………………………...…...31
2.11a APPLICATION AND USES OF REGULATOR……………………….…32
2.12 TRANSISTORS……………………………………………………………..32
2.12a TYPES OF TRANSISTORS……………………………………………….33
2.12b USES OF TRANSISTORS………………………………………………...33
2.13 PROGRAMMABLE INTERFACE CONTROLLER (PIC)………………..34
2.14 SEVEN SEGMENT DISPLAY (SSD)……………………………………...35

CHAPTER THREE: SYSTEM OPERATION……………….………………..37
3.1 BLOCK DIAGRAM AND OPERATION……………………………………37
3.2 CIRCUIT DIAGRAM AND OPERATION………………………………….44

CHAPTER FOUR: CIRCUIT DESIGN AND OPERATION………………….48
4.0 CIRCUIT DESIGN AND OPERATION………….………………………….48
4.1 CHOICE OF CONTACTOR………………………………………………….48
4.2 CHOICE OF TRANSFORMER………………………………………………48
4.3 CALCULATION FOR RECTIFICATION…………………………………...49
4.4 GENERATOR TURNOFF DELAY………...………………………………..50
4.5 COMPLETE DESIGNED CIRCUIT OF THE DISPLAY AND CONTROL………………………...51
4.6 CALCULATION FOR THE SEVEN SEGMENT TRANSISTOR SWITCHING…………………...55
4.7 CURRENT DEMAND FOR THE DISPLAY UNIT…………………………55
4.8 DISPLAY PROGRAM SOURCE CODE………….………………………...56

CHAPTER FIVE
5.1 TESTING, RESULT AND PROJECT COSTS………………………………60
5.2 TESTING……………………………………………………………………..60
5.2a VOLTAGE TESTS…………………………………………………………..60
5.2b RESISTANCE TESTS………………………………………………………61
5.2C OPERATION TESTS……………………………………………………….63

CHAPTER SIX
6.1 CONCLUSION……………………………………………………………..67
6.2 RECOMMEDATION……………………………………………………….70
REFRENCES…………………………………………………………………….71