The design and study of a computer- controlled security system(CCSS) based on a GSM phone
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Date
2011-12-15
Authors
Nyenge, Raphael
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Abstract
Computers are finding important use in home automation, communication technology, security systems, etc. Communication between a computer, sensors, and a mobile phone can be achieved by use of appropriate interfacing techniques and a suitable program. A mobile phone has found use in the areas of security, voice-to-voice communication, sending and receiving short text messages and access information services available with the network carriers. This research project focused on designing a security system that alerts a mobile phone user of a possible intrusion into his or her house, business premises, car, etc. A passive infrared (PIR), magnetic contact sensors, an alarm and a mobile phone were interfaced to a computer. The PIR sensor senses heat from a body, and the magnetic contacts sense the opening of a door or window. In this study, a Computer-based prototype system appropriate for accepting signals from sensors and controlling an alarm and a mobile phone is presented. Personal Computer (PC) parallel and serial/USB ports were configured, programmed, and used in accepting signals and controlling a mobile phone and an alarm. Once the personal computer (PC) receives input signals from the sensors, it commands the interfaced mobile phone to send a predetermined text message using the short message services (SMS) of a mobile phone network. The SMS is sent to a designated person. After a short delay, the computer triggers an alarm system. The use of a PC as a control element provides a secure security system which does not require monitoring by a central station of a private firm. The various components used in constructing the system hardware were chosen based on their performance and suitability for use in a security system. One unique part of the system was its power supply; it was able to supply IOV and 5V. Software for control, scanning of input and interpretation, was developed using C++ programming language. The operational system was tested for its suitability and reliability as a security system. Tests showed that the magnetic sensor pulled in at a distance of about 2.3cm when fixed on steel, while on air it pulled in at a distance of about 4.3cm. The PIR sensor was found to have a horizontal range of about l Om.The security system was found to be reasonably fast in sending a SMS; on average it took 25s. The mobile phone network showed a very high degree of success in sending a SMS. The alarm went off every time after sending a SMS. After suitable modifications this system can be installed in homes, banks, institutions, vehicles, factories and any other area requiring this kind of security system (with the necessary modifications).
Description
Department of Physics, 97p.:ill The TH 9737.N9 2007
Keywords
Electronic security systems, security systems