Fire Detection and Notification System

Abstract

At the end of third year when there is announcement about the final year projects and groups we decided to make something that is related to our real life, something that is interesting and different. We sit together and discussed upon a number of projects like Temperature Sensing, GSM based Home Security, Voice controlled Robotic Car, Vehicle Speed Measurement System etc. But finally, we decided to do something related to fire Detection and Control. Since our childhood we have seen fire alarm systems at various locations, such as schools, restaurants, organization offices, colleges and other public places, but never knew rhat how these systems work and what engineering approach is involved to meet this criterion. We started with a heat sensor LM-35 that gives a certain output voltage corresponding with increase in temperature. As fire occurs temperature increases therefore we have used this sensor in this project. But sometimes it may take time to reach heat to a certain level to produce enough voltage to turn on Buzzer. So in order to avoid this confusion we have used another sensor i.e. smoke sensor MQ-2. It gives a certain voltage corresponding to ionized smoke particles indicating the presence of smoke in the atmosphere. To avoid any false triggering we set a reference at the comparator depending upon the location where the system is installed, when a positive (Logic High) signal is received from both the sensors by the microcontroller that continuously monitors both the sensors, three signals are sent simultaneously from the microcontroller. One is to the buzzer that turns on the buzzer and the alarm starts sounding confirming fire and the second one sent to the GSM Modem to inform the concerned authorities regarding location of fire.