Makmur, A. and Siaulhak 2023. 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. 1, 1 (Apr. 2023), 7–10. DOI:https://doi.org/10.53696/29872359.86.