Alfiani, Nofita, Frida Agung Rakhmadi, and Su Yatman. “Instalasi Dan Evaluasi Sistem Peringatan Dini Banjir Berbasis Sensor Ultrasonik HC-SR04 Dan Internet of Things (IoT)”. Sunan Kalijaga Journal of Physics 2, no. 2 (November 15, 2020): 64–71. Accessed July 13, 2025. https://journal.uin-suka.ac.id/saintek/physics/article/view/2339.