LPG Secure: An Intelligent System for LPG Gas Leakage Detection, Prevention, and Safety Alerts

Liquefied Petroleum Gas (LPG) is one of the most widely used fuels in both domestic and industrial environments due to its efficiency, portability, and relatively low cost. However, despite its advantages, accidental leakages of LPG pose a severe safety hazard, often resulting in fire outbreaks, explosions, and life-threatening situations if not detected and addressed in time. Conventional safety solutions, such as standalone gas alarms, provide only basic sound notifications and do not incorporate preventive actions or remote communication features. This significantly limits their effectiveness, particularly when users are not physically present to respond immediately. To overcome these challenges, this paper presents the design and implementation of LPG Secure, an intelligent system for LPG leakage detection, prevention, and safety alerts. The proposed system integrates an MQ-6 gas sensor for real-time leakage detection, an Arduino Uno microcontroller for decision-making, a buzzer alarm for immediate local warning, a servo motor for automatic valve shut-off, and a GSM module for remote notification through SMS alerts. When leakage is detected above a predefined threshold, the system not only raises an audible alarm but also shuts off the gas supply to prevent further leakage and simultaneously notifies the user or emergency contacts. The prototype was tested under controlled conditions, and results confirmed rapid detection (within 3–5 seconds), high reliability (~96% accuracy), and effective multi-layered safety response. Compared with traditional solutions, this integrated system provides a comprehensive, proactive, and low-cost safety mechanism suitable for domestic kitchens as well as industrial environments. By combining continuous monitoring, automated response, and real-time communication, the system significantly enhances user safety and demonstrates the potential of smart embedded solutions for addressing everyday hazards.