Alfiani N, Rakhmadi FA, Yatman S. Instalasi dan Evaluasi Sistem Peringatan Dini Banjir Berbasis Sensor Ultrasonik HC-SR04 dan Internet of Things (IoT). physics [Internet]. 2020 Nov. 15 [cited 2025 Feb. 23];2(2):64-71. Available from: https://ejournal.uin-suka.ac.id/saintek/physics/article/view/2339