“Design of Flood Early Warning Monitoring System Using a Microcontroller Ultrasonic Sensor Based on Website and Telegram Chat Bot”. JESII: Journal of Elektronik Sistem InformasI 1, no. 2 (Desember 25, 2023): 101–110. Diakses Agustus 29, 2026. https://jesii.ukri.ac.id/jesii/article/view/3358.