DESIGN AND CONSTRUCTION OF MOBILE PHONE SIGNAL DETECTOR

Transcription

1 .~ j J :j.~ DESIGN AND CONSTRUCTION OF MOBILE PHONE SIGNAL DETECTOR BY ABIOYE OBAFEMI MICHAEL MATRICULATION NUMBER 2007/212640SEE A FINAL YEAR PROJECT SUBMITTED TO THE DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING FEDERAL UNIVERSITY OF TECHNOLOGY MINNA, NIGER STATE. IN PARTIAL FULFILMENT OF THE REQUIREMENT FOR THE AWARD OF BACHELOR OF ENGINEERING (B.ENG) DEGREE IN ELECTRICAL AND COMPUTER ENGINEERING NOVEMBER, 2011

2 DEDICATION This project specially dedicated to God almighty and to my beloved family thanks for your morale support and understanding. ii

3 DECLARATION I Mr. Abioye Obafemi Michael, hereby declare that this work was done by me and has never been presented elsewhere for the award of a degree. I also hereby relinquish the copyright to the Federal University of Technology, Minna Niger state.. ~.... (r'). ~.~.~ ~... ~... ~~.... (Name of student) I+ftt~~ ~!!;A~..... (Signature and Date) f.~~.~....f.j.~.~.. :.~1 (N e (~L)-~\ ~... ~... I (Signature and Date) (Name of supervisor) (Signature and Date) \\' - ~. ~ _ I''''17 j ~... ~ \:::> (Name of Extemal Examiner) ~~fro( (Signature and Date) iii

4 ACKNOWLEDGEMENT 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 all, spec ial thanks 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), Prof Oria Usifo and to all lecturers and lab technologies of electrical department, thank you all for imparting in me the ri ght knowled ge 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 co mpl etio n of thi s project. 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 and 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. 1 iv.",.

5 ABSTRACT The project mobile phone signal detector presents the design of an RF detector circuit device or sensor that detects the presence of 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 of any mobile phone activities within a distance of 3m, as the signal is detected the buzzer sounds alerting the users to switch off their mobile phones. Also in the circuit a part is design in ~Ul'h a \\ a) th at it can be use to switch 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 of 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 of Radio frequency and wireless communication is employed to develop the device. v

6 TABLE OF CONTENTS Title page....i Dedication....ii Declaration....iii Acknowledgement....iv Abstract... v Table of content... vi List of tables... vii L 1st 0 ffi 19ures... VIlI... List of abbreviations....ix Chapter One: Introduction Significance...' Aim and objective Methodology Scope of work Constraint and materials used Outline on thesis Chapter Two: Literature review Historical backgrounds vi

7 2.2 Theoretical backgrounds Integrated circuits (lcs) Transistors (BJT) Passive components limitations...13 Chapter Three: Design and implementation Block diagram Justifications of components Operational amplifier (741 Op-Amp IC) Transistor (C945) Ceramic and Electrolytic capacitors timer (IC) I7B integrated circuit (lc) circuit design for each stage RF detector circuit Amplification circuits timer circuit Selector circuit Power supply circuit.. ; Circuit diagram of mobile phone detector Principle of operation vii

8 LIST OF TABLES TABLE NO Light emitted by four different types of LEDs properties of741 Op-Amp PAGE ix

9 LIST OF FIGURES FIGURE NO. PAGE 2.1 Op-amp symbol and schematic timer Bipolar transistor (npn and pnp) Different type of resistor symbol Various type of capacitors Symbol of LED Block diagram of mobile phone detector pin Dip (dual-inline package) Various type of ceramic capacitor Electrolytic capacitor pictures RF detector circuit Op-amp circuit Comparator circuit Transistor amplifier circuit timer circuit Selector circuit Power supply circuit Complete circuit diagram of mobile phone detector 32 x

10 LIST OF ABBREVIATIONS DC MHz GSM Hz IC khz rna Op-Amp Vcc SIP Dip RF SMS 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 xi