Agus Suwardono, Elsanda Merita Indrawati, and Kartika Rahayu. “Rancang Bangun Alat Peringatan Dini Banjir Berbasis Sensor Ultrasonic HC-SR05”. Nusantara of Engineering (NOE) 4, no. 1 (April 28, 2021): 28. Accessed December 23, 2024. https://ojs.unpkediri.ac.id/index.php/noe/article/view/15908.