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PPT on Cell Phone Detector

Cell phones are widely used in the world. While people have to be connected to one another, there are situations or places where their usage is to be prohibited either due to security reasons or it may cause health hazards.

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PPT on Cell Phone Detector

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  1. ROORKEE COLLEGE OF ENGINEERING DEPARTMENT OF ELECTRONICS AND COMMUNICATION THESIS ON CELL PHONE DETECTOR Under guidance of Miss Priyanka Rana Submitted by :-Shradha Jha

  2. ACKNOWLEDGEMENT 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 faculty members for their guidance when I was undertaking this project. My sincere gratitude to the management of Roorkee College Of Engineering for their insightful and challenging ideas and the technical staff of the Department of Electronics and Communication Engineering for their guidance in this work. I would like to acknowledge my friend and classmate, Arzoo ,Urvashi and Priyanka for their 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. At last I would like to thank everyone along with Google without the help of whom I would have not been able to complete our project on time successfully .

  3. ABSTRACT Cell phones are widely used in the world. While people have to be connected to one another, there are situations or places where there usage is to be prohibited either due to security reasons or it may cause health hazards. Cell phone detection has been on investigation for a long time. There are techniques which have been formulated or proposed on how cell phones can be detected. Most of them use the features such as audio system, RF system and common materials of the phones and try to look into how they can be used as basis to detect mobile phones. This project utilizes the RF system of the cell phone as the feature to be used to detect its presence. A circuit that detects signals of the range 0.9GHz to 3GHz is used to detect a cell phone when in use. When the signal is detected, an LED blinks to indicate the usage of a cell phone within a radius of 1.5metres.

  4. CONTENTS • Introduction • Objectives and scope of work. • Detectability of mobile phones. • Mobile detectors • Circuit components • Working • Detection techniques • Advantages • Disadvantages • Applications • Conclusion

  5. INTRODUCTION Cell phones have become an integral part of people’s lives. They are not only used for call ,sms , emails and internet but advance applications such as remote health monitoring system and security system have been integrated with mobile phones. The recent years have seen rapid advancement in the value ,addition , applications in mobile phones such as high definition cameras and high speed internet connectivity. Country has also experienced developments in the infrastructure to support the rising need of faster internet connectivity. Despite the advantages enjoyed by the advancements in mobile technology , there are threats that have been posed by there usage. 1. Company data mining 2. Sensitiveness of life support machine 3. At places such as aeroplanes , petrol station , conference hall e.t.c the use of mobile phone can either lead to failure of sensitive machine or nuisance. It is therefore reality that mobile usage at some places must be prohibited. Due to the privacy lose that limits the use of cell phone jammers , cell phone detector must be designed and installed.

  6. OBJECTIVES AND SCOPE OF WORK • Design a circuit that can detect signals in the range of 0.9 GHz to 3GHz within a radius of 1 and half meters • Produce a notification when the signals in the range of 0.9 GHz to 3GHz are detected. SCOPE OF WORK • The project is limited to the detection of a cell phone that is in use, on call , communication via sms and internet access. • The detection of cell phones that are on standby mode , switched off or on airplane mode will not be included .

  7. DETECTABILITY OF MOBILE PHONES Mobile phones are very versatile device. They are potable and compact and can perform various functions. Most mobile phones have basic set of comparable features- • Microprocessor • ROM • RAM • Radio Module • Digital signal processor • Microphone • Speaker • Variety of hardware keys and interface • LCD

  8. MOBILE PHONE DETECTOR The cell phone detectors are mostly hand and pocket size mobile transmission detectors. It can sense the presence of an activated mobile phone from a distance of 1 and half meter. The potential detection point was carried out by looking for internal oscillators necessary to operate micro-processor and radio frequency synthesizer. The results were not satisfactory. Hence experiment was carried out to detect the cell phone by detecting the RF transmitted. This was done by use of RF signal strength meter, an amplifier, a mixer and a filter.

  9. CIRCUIT COMPONENTS • Voltage source=12V • Inductance,L1=10µH • Resistance,R1=1000ΩR4=200Ω • R2=100KΩR5Ω=100Ω • R3=3KΩ R6=10 • Transistor • IC1=LM339 • LED • Capacitance,C1=100nF

  10. CIRCUIT DIAGRAM

  11. WORKING The signals from mobile phone is a radio frequency signal. When a mobile phone is present near the circuit the RF signal from the mobile induces the voltage in the inductor via mutual induction. 1. This ac signal of high frequency of the order GHz is rectified by schottky diode. 2. Output signal is filtered out by capacitor 3. Now when the mobile phone is present near the signal , a voltage is i induced in the choke and the signal is demodulated by diode 4. This input voltage is amplified by CE transistor 5. The output voltage is more than the reference output voltage. The output of op amp is thus logic high signal and LED starts glowing to indicate the presence of mobile phone

  12. DETECTION TECHNIQUES • RF spectrum approach: In this detection approach, a passive circuit listens for any emissions from a cellular phone when it is transmitting. It does not require an external signal to detect the phone. This is advantageous areas where power emission from electromagnetic sources are highly prohibited. • It has some shortcomings. The I phone propagation range could not be detected. Even in the absence of cell phone signals could still be detected. • Frequency jamming: Mobile phone works by transmitting signal between mobile phone and base station or tower. Therefore one of the method to detect the mobile phone is to have another device transmitting at the same frequency as the mobile phone but at a higher power level. As the signal is interfered by the device service on the phone is blocked . The jamming device performs well between the two cells to ensure the total denial of service . The devices consist of following parts in the circuitry- A. Voltage controlled oscillator B. Tuning circuit C. Noise generator D. RF amplification

  13. ADVANTAGES 1. Smaller in size 2. Detection of hidden cell phones DISADVANTAGES • It is very short ranged • It does not detect the cell phone when it is switched off or in aeroplane mode or not transmitting. APPLICATIONS It is useful where use of mobiles are prohibited 1. Petrol Pump 2. Gas Station 3. Historical Place 4. Religious Places 5. Examination Hall 6. Military Bases 7. Hospitals

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