Melinda, Melinda, Yunidar Yunidar, Syaidatul Khairia, Rizka Miftahujjannah, Gopal Sakarkar, and Nurlida Basir. 2025. “Smart Door Locking System for Children Using HC-SR04 and IoT Technology”. Jurnal Nasional Teknik Elektro 14 (2):73-80. https://doi.org/10.25077/jnte.v14n2.1293.2025.