Development of Bluetooth Controlled Gas Detection Rover for Hazardous Environment Monitoring

Gas leakage incidents remain a critical concern in industrial and domestic environments due to their potential to cause fires, explosions, and severe health hazards. Timely identification of combustible and toxic gases, such as liquefied petroleum gas (LPG), methane, and smoke, is essential to ensure operational safety and minimize risks. This study presents the design and implementation of a compact, mobile gas detection system capable of remote monitoring in hazardous zones. The proposed system integrates an Arduino Uno microcontroller with MQ-2 and MQ-6 gas sensors to detect smoke and LPG concentrations. A wheeled robotic platform driven by TT motors and controlled via an L298N motor driver enables mobility in confined or unsafe areas. Remote navigation is achieved using an HC-05 Bluetooth module interfaced with a smartphone-based control application. To enhance operational safety, an HC-SR04 ultrasonic sensor is incorporated for obstacle detection and avoidance. Real-time gas concentration levels are displayed on a 16×2 LCD module, while alert mechanisms, including LEDs and an audible buzzer, are activated upon detection of gas levels exceeding predefined thresholds. The system is powered by a dual 18650 Li-ion battery pack with voltage regulation provided by an LM2596 buck converter to ensure stable operation. The developed prototype demonstrates a cost-effective and portable solution for gas leakage detection, suitable for deployment in industrial facilities, residential kitchens, chemical laboratories, and emergency response scenarios. The system enhances safety by reducing the need for human intervention in high-risk environments. Unlike conventional stationary gas detection systems, the proposed approach combines mobility, remote operation, and multi-sensor integration to enable dynamic monitoring in inaccessible or hazardous environments.