i need lpg gas leakage detector code diagram

lpg gas leakage detector using pic16f877a

Abstract

Home security has been a major issue where crime is increasing and everybody wants to take proper measures prevent intrusion. In addition there was a need to automate home so that user can take advantage of the technological The project is aimed at developing the security of Home against
Intruders, Gas Leak and Fire. In any of the above three cases any one met while you are out of your home than the device sends SMS to the emergency no provided to it. The report consists of a background into the area of 8051 microcontroller and mobile communication, how they are
interfaced to each other and AT commands set used in communication. SMS based LPG gas leakage detection system using GSM has application in various areas like home, industries, hotels, hospitals. This project has a gas leakage detector implemented by using a LPG Gas sensor. User can get remote indication through SMS sent from project. This SMS is sent from GSM modem which is connected to the microcontroller. Buzzer is turned on after LPG gas leakage so it acts as a gas leakage alarm.

The presence of dangerous LPG leakage in the cars, service station or in the storage tank environment can be detected using the Ideal Gas Sensor. This LPG gas leakage detector unit can be easily integrated into a unit that can sound an alarm or give a visual suggestion of the LPG concentration. The sensor has both admirable sensitivity and rapid response time. This sensor can also be used to sense other gases like iso-butane, propane, LNG and even cigarette smoke.



The output of the sensor goes LOW as soon as the LPG sensor senses any gas leakage from the storage. This is detected by the microcontroller and the LED & buzzer is turned ON. After the delay of few milliseconds, the exhaust fan is also turned ON for throwing the gas out and it continues sending message as ‘GAS LEAKAGE’ to a mobile number which is pre-defined.


INTRODUCTION
MQ-5 semiconductor sensor is Combustible Gas Sensitive. The MQ-5 gas sensor is made up of SnO2 which has lower conductivity in clean air. A simple electro-circuit is used here which is used to convert the changing conductivity into corresponding output signal of gas concentration. Both Methane and Propane can be detected easily by MQ-5 sensor because it has high sensitivity towards Methane, Propane and Butane. It is a low cost sensor suitable for different application.