ZHONG, Xiaolei; QIAO, Rui. Design and Implementation of an Intelligent Ultrasonic System based on 51 Microcontroller. International Journal of Electric Power and Energy Studies, [S. l.], v. 2, n. 2, p. 50–58, 2024. DOI: 10.62051/ijepes.v2n2.06. Disponível em: https://wepub.org/index.php/IJEPES/article/view/2474. Acesso em: 14 feb. 2026.