DESIGN AND CONSTRUCTION OF MOBILE PHONE SIGNAL DETECTOR.pdf

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j

DESIGN ND CONSTRUCTION OF MOBILE

J PHONE SIGN L DETECTOR

j

Y

ABIOYE OBAFEMI MICHAEL

MATRICULATION NUM ER

2007 212640SEE

A FINAL YEAR PROJECT SUBMITTED TO THE DEPARTMENT OF

ELECTRICAL AND COMPUTER ENGINEERING FEDERAL UNIVERSITY

O TECHNOLOGY MINNA, NIGER STATE.

IN

PARTIAL FULFILMENT OF THE REQUIREMENT FOR THE AWARD

O BACHELOR OF ENGINEERING B.ENG) DEGREE IN ELECTRICAL

AND COMPUTER ENGINEERING

NOVEMBER 2011


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DEDIC TION

This project specially dedicated to God almighty and to my beloved family thanks for your

morale support and understanding


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DECL R TION

I Mr. Abioye Obafemi Michael, hereby declare that this work was done by me and has

never been presented elsewhere for the award

o

a degree.

I

also hereby relinquish the copyright

to the Federal University o Technology, Minna Niger state .

€ . ~ . ~

.

(Name

o

student) (Name o supervisor)

I + f t t ~ ~ ••• ; A ~

(Signature and Date)

f ~ ~ ~

~

~ 1


-

~ I 1 7 j

\:::>

(N e

~ L ) - ~ \

. . . . . . . . . . . . . . . . .

(Name

o

Extemal Examiner)

~ ~ f r o (



iii


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CKNOWLEDGEMENT

Thanks to God all mighty for giving me good health to undergo this project. I would like

to use this opportunity to express my deep gratitude and appreciation to those people who have

helped me to complete my final year project course, and to individuals to whom i am very much

indebted and who, without their support, this achievement would not have been possible. First of

a , sp

ec

ial tha

nk

s to my supervisors Mr. U.N . Galadima and Mr Bakudu Saleh for their

guidance, advice and encouragement and also to Mr. A.G Raji HOD electrical),

rof

Oria Usifo

and to all lecturers and lab technologies of electrical department, thank you all for imparting in

me th e right knowledge throughout my educational career in this school.

My greatest appreciations and thanks are dedicated to my parents Mr. and Mrs. Joseph

Abioye from whom i have taken the lesson of life and always prayed for my success, i am very

proud of them.

Also, many thanks to my friends with whom i have shared so much fun and so many

good times over the past few years in my campus life especially my roommate, Jimmy Enebi and

my class-mate Lawrence Emmanuel, Segun Adetayo Peter for their suggestion and help in the

compl

et

io

n of

thi

s projec

t.

Although i cannot mention them all by their names , i am grateful to

all of them and wish them all the best.

.

Finally, special thanks to all the members of my family Tunde, Moses, Segun, sister

Tope. Mrs. Maaji. my niece a

nd

nephew Eniola Ayeni and Joseph Ayemoba, thank you very

much for the warmth and kindness you all always offered me and also to my big sister Bunmi

Emmuela Abioye for her support both financially and encouragements, thank you very much.

·

iv

. ,

.


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BSTR CT

The project mobile phone signal detector presents the design

o

an RF detector circuit

device or sensor that detects the presence o a mobile phone in active mode use in making

incoming and outgoing calls as well as sending SMS messages i.e. the device senses the presence

o

any mobile phone activities within a distance o 3m, as the signal is detected the buzzer

sounds alerting the users to switch

o

their mobile phones. Also in the circuit a part is design in

~ U l h

a \\ a

th

at

it

can be use to sw

it

ch ON and OFF appliances i.e as the phone

is

dialed it

switches ON the appliance and as it is dialed again for the second time it switches OFF. The idea

is to design a circuit that detect the presence

o

mobile phone signal and to investigate basic

electronic components involve in RF circuit design in order to test and simulate analogue RF

circuit. The principle

o

Radio frequency and wireless communication is employed to develop

the device.


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T BLE OF CONTENTS

Title page

i

Dedication ii

Declaration iii

Acknowledgement iv

Abstract v

Table

of

content vi

List of tables vii

L

· i

1st

0 19ures VIlI

List of abbreviations ix

Chapter One: Introduction 1

1 1

Significance 2

1.2 Aim and objective 2

1.3 Methodology ..

2

1.4 Scope ofwork . 3

1.5 Constraint and materials used 3

1.6 Outline

on

thesis .

3

Chapter Two: Literature review ...4

2.1 Historical backgrounds

4-5

vi


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2.2 Theoretical backgrounds

5-6

2.2.1 Integrated circuits lCs) . 6-8

2.2.2 Transistors BJT) 8-10

2.2.3 Passive components 10-13

2.3

limitations

13

Chapter Three: Design and implementation

14

3.1 Block diagram 14

3.2 Justifications of components 16

3.2.1 Operational amplifier

741

Op-Amp IC) 16-17

3.2.2 Transistor C945) 17

3.2.3 Ceramic and Electrolytic capacitors 18-19

3.2.4

555

timer IC) 19

3.2.5 40I7B integrated circuit lC) 20

3.3

circuit design for each stage 20

3.3.1 RF detector circuit 20-23

3.3.2 Amplification circuits 24-28

3.3.3 555 timer circuit 29

3.3.4 Selector circuit

30

3.3.5 Power supply circuit .. ; 31

3.4 Circuit diagram ofmobile phone detector. 32

3.4.1 Principle of operation ..33-34

v


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TABL

E

NO

2 1

3 1

LIST OF T BLES

Light emitted by four different types

of

LEDs

properties

of741 Op Amp

ix

P

GE

12

17


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DC

MHz

GSM

Hz

IC

kHz

rn

Op Amp

Vcc

SIP

Dip

RF

SMS

LIST OF BBREVI TIONS

Direct current

Megahertz

Global System for Mobile Communications

Hertz

Integrated Circuits

kilohertz

Miliampere

Operational Amplifier

supply voltage

single in line package

dual in line package

radio frequency

short messaging system

x

DESIGN AND CONSTRUCTION OF MOBILE PHONE SIGNAL DETECTOR.pdf

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