Arapa, Alman, Selvi Mayang Sari, Rika Setyowati, Ahmad Musawwir, and Sarwono. 2026. “Conceptual Design of an ESP32-Ultrasonic-Based Patient Visitor Counting System for Health Information Education”. Journal of Information Systems and Technology Research 5 (3):369-78. https://doi.org/10.55537/jistr.v5i3.1866.