Simulasi Sistem Monitoring Pasang Surut Air Laut Dan Peringatan Dini Tsunami Menggunakan Sensor Hc-Sr04: Simulation of Sea Water Tide Monitoring and Tsunami Early Warning System Using HC-SR04 Sensor . JEITECH. 2023;1(1):67-75. Diakses Oktober 9, 2025. https://journal.unram.ac.id/index.php/jeitech/article/view/2848