Sinaga, Mikha, Ayub Ibrahim, and Nita Sembiring. “Smart Assistive Stick With Arduino and Multidirectional Ultrasonic Sensors for Intelligent Obstacle Detection and Navigation”. CogITo Smart Journal 11, no. 2 (December 30, 2025): 311–322. Accessed January 2, 2026. https://cogito.unklab.ac.id/index.php/cogito/article/view/886.