PERANCANGAN SISTEM ALAT PENDETEKSI BANJIR MENGGUNAKAN SENSOR ULTRASONIK JSN-SR04T BERBASIS INTERNET OF THINGS DI TANAH ABANG KABUPATEN PENUKAL ABAB LEMATANG ILIR

The increase in river water discharge that causes flooding is a significant problem faced by residents of Tanah Abang, Penukal Abab Lematang Ilir Regency. To minimize losses due to flooding, an effective early warning system is needed. This report describes the design and implementation of an Internet of Things (IoT)-based flood detection system using the JSN-SR04T ultrasonic sensor. This system allows real-time water level monitoring and provides alerts via email and application notifications. Test results show that the device is able to detect water levels with high accuracy in the range of 25 cm to 450 cm. The system successfully provides early warning notifications via the Blynk application according to three alert levels: Alert 1 (120-100 cm), Alert 2 (100-80 cm), and Alert 3 (<80 cm). Thus, this device is effective in providing information and increasing community preparedness for potential flooding so that residents can take preventive actions early, such as evacuation or protection of property. In addition, this system facilitates the government in monitoring and collecting environmental data for further analysis, urban planning, and climate change studies. The methods used in this report include literature studies, interviews, and observations to develop an efficient and reliable detection system.