Mardiana, Yuvina, Nst, T.A.T. and Benu, S.M. 2024. Development of an IoT-Based System for River Siren Control and Height Detection Utilizing LoRa and Solar Cell Technology. International Journal of Research in Vocational Studies (IJRVOCAS). 3, 4 (Jan. 2024), 107–112. DOI:https://doi.org/10.53893/ijrvocas.v3i4.45.