Farisya Syifa Ramadhani, et al. “DESIGN AND ANALYSIS OF AN AUTOMATIC DOOR USING AN ULTRASONIC SENSOR BASED ON ARDUINO UNO”. Bulletin of Engineering Science, Technology and Industry, vol. 4, no. 4, Oct. 2026, pp. 2190-0, https://bestijournal.org/index.php/go/article/view/267.