ABSTRACT
One of the most common types of energy source used in domestic is liquefied gas. Liquid Petroleum Gas (LPG) is a highly inflammable gas. Though the safety issues are considered by the company, leakage of gas has become very common accident which can cause damage to human lives and property. Our project aims to make a low cost, power efficiency centralized LP gas leakage alarm system with exhaust. The system has two main devices: the gas detector (MQ-6 Gas Sensor) and the centralized alarm unit. The gas detector that is located close to the gas usage point (gas cylinder), is a battery operated device that is designed to operate for extended period of time using 9V batteries. There can be more than one detector in the systems, which can be separately identified in the system. The centralized alarm unit detects the signals sent by the detectors and releases the alarm. The main working principle is the comparison of voltage drop between Reference voltage and the MQ-6 gas sensor voltage. It has an indication of which detector has released the alert. The alarm unit will be ac mains powered and will have a battery backup to cater power failures. The components of the device will be been chosen considering the power consumption.