Wireless Sensor Networks (WSN) has recently been applied in various monitoring applications including hazardous gases detection. In this paper we present a WSN for hazardous gases detection with a special emphasis given on its monitoring and controlling for home safety. LPG leak can happen, though rarely, inside a home, commercial premises or in gas powered vehicles. Leakage of this gas is dangerous as it enhances the risk of explosion. Therefore, systems should be developed that can monitor the level of LPG gas in the vicinity of the firefighters and generate appropriate alarms if levels of such gases exceed the prescribed safe levels, sending SMS on user mobile phone and turning off the gas supply valve as a primary safety measure. The system more like a First Aid, automatically uses a normally closed solenoid valve for shutting off of the gas valve before calling for help via visual display and audible alarm to those within the environment. For the purpose, we propose to set up wireless sensor nodes to monitor the leakage area by measuring the Received Signal Strength Indicator (RSSI) values received by these sensor motes strategically placed at different locations.
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