keywords: Microcontroller, MQ-2 gas sensor, Buzzer, LCD, LPG
Over the years incidences of fire outbreaks in both industrial environments and homes that resulted from gas leakages have been reported and documented. The inferno that resulted from some of the leakages were so enormous that colossal damages were recorded. These damages included loss of human lives, serious fire injury resulting in permanent disability, loss of properties, loss of relevant documents and other precious belongings that run into billions of naira to mention but a few. This paper shows the design and implementation of an electronic gas leakage sensor system which senses gas leakage(s) and promptly alerts the user through both an incorporated alarm system via the buzzer, and a status display on the liquid crystal display. The overall design aim was achieved using a microcontroller and an MQ-2 gas sensor which sends signal to the microcontroller whenever the concentration of the gas in the system’s environment is above 400 ppm (0.04%).The microcontroller in turn sends signals to the LCD which displays the statement ‘Gas detected’ and the Buzzer which sounds to alert the user of gas leak/presence of gas in the environment continuously until the system is reset.