DESIGN AND IMPLEMENTATION OF A MOBILE PHONE DETECTOR

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DESIGN AND IMPLEMENTATION OF A MOBILE PHONE DETECTOR

ABSTRACT

This work involves the design and development of a mobile phone detector which is capable of detecting incoming and outgoing signals from mobile phones. The presence of an activated mobile phone can be detected by this handy, pocket-size mobile signal detector from a distance of one and a half meters, which could be used in preventing the use of mobile phones in examination halls, confidential rooms etc. It is also suitable for detecting the use of mobile phone for spying and unauthorized video transmission. The circuit can detect the incoming and outing calls, text messages, and video transmission even if the mobile is kept in the silent mode. The moment the gadget detects Radio Frequency (RF) transmission signal from an activated mobile phone, it starts sounding a beep alarm and the Light Emitting Diode (LED) blinks. The alarm continues until the signal transmission ceases. The circuit is assembled on a general purpose PCB as compact as possible and enclosed in a small box.

CHAPTER ONE

1.1 Background of the study

In recent years, there has been increasing focus on issues relating to the use of mobile phones in restricted, prohibited, and unauthorized areas. The reason for this increased interest is largely due to disturbance, as well as wrong and inappropriate usage of mobile phones by the owners and users alike. Other areas like churches, mosques, offices, and prisons, just to mention a few, are not left out. There is need for the detection of mobile phone signals in areas like these.

Efforts have been put in place in tackling this issue but they all have their own shortcomings, one of which is the mobile phone jammer. A mobile phone jammer is an instrument used to prevent cellular phones from receiving signals from base stations. When used, the jammer effectively disables cellular phones. These devices can be used in practically any location, but are found primarily in places where a phone call would be particularly disruptive because silence is expected. The shortcoming of such a technology is the inability to make calls especially in cases of emergencies. However, this mobile signal detector has the feature of receiving and making calls during emergencies, except that the alarm and the LED will keep beeping and blinking respectively. Mobile phones uses RF with a wavelength of 30cm at 872 to 2170 MHz that is, the signal is high frequency with huge energy. When the mobile phone is active, it transmits the signal in the form of sine wave which passes through the space. The encoded audio/video signal contains electromagnetic radiation which is picked up by the receiver in the base station.

1.2 Statement of the problem

The existing technology currently available in the open market utilizes mostly discrete components, and a design approach using a down converter in conjunction with a band pass filter. These technologies are not adequate because they are inaccurate and expensive.

1.3 Design procedure

An ordinary RF detector using tuned LC circuits is not suitable for detecting signals in the GHz frequency band used in mobile phones due to the high frequency at which it transmit and huge energy that it gives out.

Figure 1:

Block Diagram. The construction of this pocket size mobile phone signal detector is so simple and not expensive. For the construction to be understood and appreciated a more detailed description of the design is required using the block diagram. The design consists of four stages as shown in the block diagram. 1. The sensor stage 2. The power stage 3. Operational Amplifier (Op-Amp) stage 4. Response stage From the above block diagram, once the RF antenna receives wireless signal after the circuit has been powered by a 9 Volts dc battery, the operational Amplifier LM358AN amplifies the received signal which is turn triggers the buzzer and makes the LED to flicker when signal is detected.

1.4 Purpose of the study

To construct a mobile phone detector capable of effectively detecting signals from mobile phones

1.5 Limitations of the study

There was limited time and finance in the course of the study

1.6 Definition of terms

Mobile phone:

A mobile phone (also known as a cellular phone, cell phone, hand phone, or simply a phone) is a phone that can make and receive telephone calls over a radio link while moving around a wide geographic area. It does so by connecting to a cellular network provided by a mobile phone operator, allowing access to the public telephone network

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