Abstract: Liquefied Petroleum Gas (LPG) is a widely used energy source for domestic, commercial, and industrial applications; however, accidental leakages pose serious threats such as explosions, fire hazards, and health risks resulting from gas inhalation or suffocation. To address these concerns, this study proposes a smart LPG leakage detection and alert system integrated with an SOS emergency response feature. The system employs an MQ-2 smoke and gas sensor to continuously monitor LPG concentration levels in the environment. When the gas concentration exceeds a predetermined safety threshold, the Arduino UNO R3 CH340G microcontroller processes the signal and triggers an SMS alert through the SIM800L GPRS GSM module, immediately notifying users about the leakage. If no action is taken within a specified time, the system automatically initiates an SOS call to the nearest fire station, transmitting the GPS location for a rapid emergency response. Designed to be cost-effective, compact, and easy to install, the system enhances safety in residential and industrial environments by providing real-time alerts and automated communication during critical situations. The proposed work presents the design, implementation, and performance evaluation of the system, demonstrating its reliability, efficiency, and potential for large-scale deployment in safety-critical applications.

Keywords: LPG, GSM technologies, Gas Sensor, Arduino, SOS Alert System, Real-Time Monitoring.

Downloads: | DOI: 10.17148/IJIREEICE.2025.131027