Simulasi Alat Pintu Otomatis Kereta Api Menggunakan Sensor Ultrasonic Berbasis Microcontroller. JSSR [Internet]. 2021 Jun. 17 [cited 2026 Aug. 2];4(2):147 –154. Available from: https://goretanpena.com/jurnal/index.php/JSSR/article/view/550