Simatupang, Frengki, and Waldo Owen Nainggolan. “Design and Implementation of Rain Gauge Measurement Using Ultrasonic Sensor HC-SR04 (Case Study Using Ombrometer Method)”. Piston: Journal of Technical Engineering 7, no. 2 (January 17, 2024): 80–90. Accessed July 31, 2024. https://openjournal.unpam.ac.id/index.php/Piston/article/view/36619.