Makmur, Alfhian, and Siaulhak. “DEVELOPMENT OF A RIVER WATER LEVEL MONITORING SYSTEM IN BONELEMO VILLAGE BASED ON ARDUINO MICROCONTROLLER USING ULTRASONIC SENSORS AND SMS GATEWAY”. Edutech: Jurnal Pendidikan Dan Teknologi, vol. 1, no. 1, Apr. 2023, pp. 7-10, doi:10.53696/29872359.86.