Juman Kundang K, Tjahjono B, Yulhendri and Apresia Kadek 2021. Design And Build A Room Security System Based On Internet Of Things (IOT). International Journal of Science, Technology & Management. 2, 3 (May 2021), 710-717. DOI:https://doi.org/10.46729/ijstm.v2i3.186.