Microcontroller-based Sonar Ultrasonic Water Level Control System with Closed-loop Control ApproachUsman Ahmad, Hassan Ali, M. Haseem Umer, Abid Imran, Arsalan Arif and Taqi Ahmed CheemaMATEC Web Conf., 381 (2023) 01008DOI: https://doi.org/10.1051/matecconf/202338101008