Construction Of Railway Door Automation Prototypes Using Arduino, Servo Motors and Ultrasonic Sensors : Konstruksi Prototipe Otomatisasi Pintu Kereta Api Menggunakan Arduino, Motor Servo, Dan Sensor Ultrasonik. Digitalzone 2023, 14 (1), 1-12. https://doi.org/10.31849/digitalzone.v14i1.13584.