Fajar Rahayu, Achmad Zuchriadi, Ade Fikri Fauzi, and Annastya Bagas Dewantara. “Prototype Flood Detection Water Level Monitoring IoT Web Based With Ultrasonic Sensor HC-SR04”. Jurnal Mantik, vol. 6, no. 2, Aug. 2022, pp. 2006-14, doi:10.35335/mantik.v6i2.2582.