Zhong, Xiaolei, and Rui Qiao. “Design and Implementation of an Intelligent Ultrasonic System Based on 51 Microcontroller”. International Journal of Electric Power and Energy Studies 2, no. 2 (June 26, 2024): 50–58. Accessed April 29, 2026. https://wepub.org/index.php/IJEPES/article/view/2474.