Sujono, Sujono, and Muhammad Rusli M. “Implementasi Sistem Peringatan Banjir Dini Dengan Sensor HC-SR04 Berbasis ESP32 Internet of Things”. Computer Journal 4, no. 1 (February 10, 2026): 41–51. Accessed June 28, 2026. http://journal.ypmma.org/index.php/cj/article/view/385.