Simulasi Alat Pintu Otomatis Kereta Api Menggunakan Sensor Ultrasonic Berbasis Microcontroller. JOURNAL OF SCIENCE AND SOCIAL RESEARCH, [S. l.], v. 4, n. 2, p. 147 –154, 2021. DOI: 10.54314/jssr.v4i2.550. Disponível em: https://jurnal.goretanpena.com/index.php/JSSR/article/view/550.. Acesso em: 27 jul. 2026.