Changa engg student develops security device

This device triggers security alarm during robbery, fire, LPG leakage & also maintains temperature

Devanshi Joshi. Vadodara/DNA
Sunday, October 12, 2008

Harshang Shah, a student of electronics and communication engineering in Charotar institute of technology, Changa, has developed a multi sensor device (MSD) that provides security alarms on robbery, fire and LPG leakage and can also be used for temperature maintenance of air conditioners at predetermined levels.The security system has various sensors that can detect the opening of doors, windows and drawers. So when an unknown person opens the window or door of your home, thin wire installed in the door or window breaks, leading to an open circuit that sends a signal to the sensor and it starts buzzing. Various sensors like sound sensor, bump sensor, interruption sensor and temperature sensor have been designed by Shah. Sound sensors when kept in the cupboard just adjacent to the lock, acts in the same way. These devices are sensitive to even the small sound produced by as key when inserted. This sound sensor can also be placed on the floor to catch the sounds of burglar's footsteps. Bump sensors are very sensitive to even the slightest touches when placed below a doormat Harshang says, "When you are away, you just have to switch on the sensors and they start working."The interruption sensors installed in a doorway or a passage can detect any person passing through them. They work on modulated Infra Red (IR) rays that are invisible to the human eye. The proximity sensors detect the presence of a person and can be used to guard the displayed objects in an exhibition. The temperature sensor can be used in an air conditioner. It increases or decreases the room temperature according to the climate. The light sensor detects the smoke and in case of fire, the alarm on it shows the signals. The MSD developed by Harshang has also won a prize during inter college event. He said "The MSD is designed in such way that it even functions on battery during electricity failures. If a burglar attempts to cut any wire of the sensor, or tries to tamper with it, it can be detected immediately. Hence it is a fool proof system. The security status of all the sensors is displayed on the LCD. Surveillance cameras can also be connected, so the cameras can display images/ videos on a close circuit TV."The system is easy to operate. To make the technique more advanced, Harshang is planning to add more features by connecting the sensor system to internet. "If the experiment goes successful, security status of all the sensors could be accessible from anywhere in the world. I am also working to connect it to a cell phone network by placing a GSM terminal in it, so that on can get text message when a burglar is detected. It is my dream to make MSD perfectly user friendly,” Harshang told DNA.