Arapa, Alman, Selvi Mayang Sari, Rika Setyowati, Ahmad Musawwir, and Sarwono. “Conceptual Design of an ESP32-Ultrasonic-Based Patient Visitor Counting System for Health Information Education”. Journal of Information Systems and Technology Research 5, no. 3 (August 31, 2026): 369–378. Accessed September 6, 2026. https://journal.aira.or.id/jistr/article/view/1866.