LPG Leakage Detection and Automated Prevention System Using Arduino

Abstract: Liquefied Petroleum Gas (LPG) is widely used in domestic and industrial environments because of its high energy efficiency and affordability. However, accidental gas leakages present severe safety hazards including catastrophic fires, explosions, and suffocation. This paper presents the design and implementation of a compact, low-cost LPG leakage detection system equipped with an automatic regulator cut-off mechanism and real-time status monitoring. The proposed system employs an MQ-2 gas sensor for continuous detection of LPG concentration, an Arduino Uno microcontroller for processing sensor data, color-coded LED indicators for immediate visual status alerts, and a micro-servo motor mechanism that physically rotates the gas regulator knob to the OFF position when concentrations exceed a safe threshold. Real-time messages are provided through an integrated OLED module. The system operates reliably using a 5V supply and demonstrates quick response during testing by switching to alert mode and activating the cut-off mechanism within seconds of gas exposure, effectively removing human intervention from primary accident prevention.

Keywords: LPG leakage detection, Arduino Uno, MQ-2 gas sensor, automated safety mechanism, micro-servo motor, OLED display module, embedded systems.