Cell Phone Detector - University of Nairobi

[Pages:51]CELL PHONE DETECTOR

PROJECT INDEX: PRJ071

By MWANGO AMBROSE NYALE

F17/1438/2011

SUPERVISOR: DR. V. DHARMADHIKARY EXAMINER: DR. AKUON

Project report submitted in partial fulfillment of the requirement for the award of the degree of

Bachelor of Science in Electrical and Electronic Engineering of the University of Nairobi

Date of submission: 13th May 2016 Department of Electrical and Information Engineering

DECLARATION OF ORIGINALITY

NAMEOFSTUDENT:

MWANGO AMBROSE NYALE

REGISTRATION NUMBER:

F17/1438/2011

COLLEGE:

Architecture and Engineering

FACULTY/SCHOOL/INSTITUTE: Engineering

DEPARTMENT:

Electrical and Information Engineering

COURSE NAME:

Bachelor of Science in Electrical and Electronic Engineering

TITLE OF WORK:

CELL PHONE DETECTOR

1. I understand what plagiarism is and I am aware of the university policy in this regard. 2. I declare that this final year project report is my original work and has not been

submitted elsewhere for examination, award of a degree or publication. Where other peoples work or my own work has been used, this has properly been acknowledged and referenced in accordance with the University of Nairobis requirements. 3. I have not sought or used the services of any professional agencies to produce this work. 4. I have not allowed, and shall not allow anyone to copy my work with the intention of passing it off as his/her own work. 5. I understand that any false claim in respect of this work shall result in disciplinary action, in accordance with University anti-plagiarism policy.

Signature:.........................................................

Date:...............5/13/16....................................

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DEDICATION Dedicated to my mother and family,

you are a handful but you mean a lot to me

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CERTIFICATION This report has been submitted to the Department of Electrical and Information Engineering, University of Nairobi with my approval as supervisor:

......................................... Dr. V. Dharmadhikary

Date............................................

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ACKNOWLEDGEMENTS I would like to thank the Almighty God for giving me strength and wisdom throughout this project. I would also like to extend my sincere gratitude to my supervisor, Dr. V. Dharmadhikary for his guidance when I was undertaking this project. My sincere gratitude to Mr. Gevirah Otieno for his insightful and challenging ideas and the technical staff of the Department of Electrical and Information Engineering for their guidance in this work. I would like to acknowledge my friend and classmate, Rajab Said for his motivation and challenging ideas to ,,think without the box. To my classmates whom we spent hours brainstorming for ideas, I am very grateful for your efforts.

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TABLE OF CONTENTS

DECLARATION OF ORIGINALITY.................................................................................... DEDICATION ......................................................................................................................II CERTIFICATION ................................................................................................................ III ACKNOWLEDGEMENTS ................................................................................................ IV TABLE OF FIGURES........................................................................................................ VII ABSTRACT ...................................................................................................................... VIII

CHAPTER 1: INTRODUCTION ..............................................................................................1

1.1 BACKGROUND ..................................................................................................................1 1.2 PROBLEM STATEMENT......................................................................................................2 1.3 PROBLEM JUSTIFICATION .................................................................................................2 1.4 MAIN OBJECTIVES............................................................................................................3 1.5 SCOPE OF WORK ...............................................................................................................3

CHAPTER 2: LITERATURE REVIEW ...................................................................................4

2.1 DETECTABILITY OF MOBILE PHONES ................................................................................4 2.1.1 The RF System .........................................................................................................4 2.1.2 Combined Audio and RF Signals.............................................................................5

2.2 COMMERCIAL CELL PHONE DETECTORS ..........................................................................7 2.2.1 WolfhoundTM Pro Cellphone Detector.....................................................................7 2.2.2. Manta Ray Cell Phone Detector.............................................................................9

2.3 DETECTION TECHNIQUES ...............................................................................................10 2.3.1 RF Spectrum Approach .........................................................................................10 2.3.2 Frequency Jamming ..............................................................................................13

CHAPTER 3: DESIGN............................................................................................................16

3.1 IMPLEMENTATION DESIGN .............................................................................................16 3.1.1 Block Diagram.......................................................................................................16

3.2 HIGH FREQUENCY LOOP ANTENNA ................................................................................16 3.3 CURRENT TO VOLTAGE CONVERTER ..............................................................................17 3.4 AMPLIFIER......................................................................................................................18 3.5 COMPLETE CIRCUIT........................................................................................................21

CHAPTER 4: RESULTS AND DISCUSSION.......................................................................23

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4.1 SIMULATION RESULTS ....................................................................................................23 4.2 PRACTICAL RESULTS ......................................................................................................24 CHAPTER 5: CONCLUSION AND RECOMMENDATION ...............................................28 5.1 CONCLUSION ..................................................................................................................28 5.2 RECOMMENDATIONS AND FURTHER WORK.....................................................................28 REFERENCES ........................................................................................................................ 29 BIBLIOGRAPHY .................................................................................................................... 30 APPENDICES .........................................................................................................................31 A: DATASHEETS ...................................................................................................................31 B: PROJECT COST ANALYSIS ................................................................................................42 C: PCB LAYOUT ..................................................................................................................42

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TABLE OF FIGURES FIG 2.1: MAGNETIC COUPLING TEST SET-UP................................................................................5 FIG 2.2: COMBINED AUDIO AND RF SET-UP ................................................................................6 FIG 2.3: COMBINED AUDIO AND RF BLOCK DIAGRAM ................................................................6 FIG 2.4: RESULTS ........................................................................................................................7 FIG 2.5: SETTING UP SCREEN.......................................................................................................8 FIG 2.6: WOLFHOUND PRO CELLPHONE DETECTOR......................................................................8 FIG 2.7: WOLFHOUND PRO PC SOFTWARE....................................................................................9 FIG 2.8: MANTA RAY CELLPHONE DETECTOR.............................................................................10 FIG 2.9: BLOCK DIAGRAM .........................................................................................................11 FIG 2.10: LCD INTEGRATION....................................................................................................11 FIG 2.11: CELLPHONE DETECTOR TYPICAL CIRCUIT ..................................................................12 FIG 2.12: CELLPHONE DETECTOR WITH FREQUENCY DOWN CONVERTER...................................12 FIG 2.13: CELLPHONE JAMMER IN A CELL .................................................................................14

FIG 3.1: BLOCK DIAGRAM ........................................................................................................16 FIG 3.2: CURRENT TO VOLTAGE CONVERTER ............................................................................17 FIG 3.3: AMPLIFIER ...................................................................................................................19 FIG 3.4: AMPLIFIER DC POINT ANALYSIS ..................................................................................20 FIG 3.5: BJT 1 ANALYSIS ..........................................................................................................20 FIG 3.6: BJT 2 ANALYSIS..........................................................................................................21 FIG 3.7: COMPLETE DETECTOR CIRCUIT ....................................................................................21 Fig 4.1: Output simulation results......................................................................23

FIG 4.2: DETECTOR OUTPUT WHEN CELL PHONE IS NOT IN USE .................................................24 FIG 4.3: DETECTOR OUTPUT WHEN CELL PHONE IS IN USE .........................................................25 FIG 4.4: DETECTOR OUTPUT WHEN CELL PHONE IS IN USE .........................................................26 FIG 4.5: OUTPUT AT LED..........................................................................................................27 Table 1: Project cost..............................................................................................................42

Fig c.1: PCB Layout.....................................................................................42

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