AUTONOMOUS ULTRASONIC BASED WATER LEVEL DETECTION AND CONTROL SYSTEM. Nigerian Journal of Technology, [S. l.], v. 37, n. 2, p. 508–513, 2018. DOI: 10.4314/njt.372.1690. Disponível em: https://www.nijotech.com/index.php/nijotech/article/view/1690. Acesso em: 27 apr. 2026.