Design of Lightning Strike Danger Zone Detection System Using the Rolling Sphere Method Integrated with Smartphones

Buildings on the campus of the Faculty of Engineering Untirta have the potential to reflect or experience direct lightning strikes during storms, which can endanger pedestrians in open areas. Unfortunately, until now there has been no danger warning in the open area, so pedestrians are not prepared to face unexpected situations, especially when it rains accompanied by lightning. Direct lightning strikes are one of the most risky hydrometeorological events. The impact can damage various objects and threaten human life. With a large open area on campus, the threat of lightning strikes can occur at any time, especially during the rainy season. Therefore, this study aims to design and apply a lightning strike danger zone detection device in the campus area of the Faculty of Engineering Untirta, which is located in Cilegon. This tool is designed to provide early warning through smartphone notifications, so pedestrians can be more aware of potential dangers. The research stage includes analyzing the open area of the campus using the Rolling Sphere method, which is used to identify vulnerable points affected by lightning strikes. After that, area plotting is carried out based on the results of the analysis. The next step is to create a detection tool that functions to identify the danger zone of a direct lightning strike, which is then integrated with smartphone notifications. With this tool, it is hoped that pedestrian safety on the campus of the Faculty of Engineering Untirta can be better maintained, especially in bad weather conditions.