Yudha, Fauzan Syafril, Yulkifli Yulkifli, Asrizal Asrizal, and Yenni Darvina. 2024. “Design of a Free Fall Motion Experiment Using E18-D80NK Proximity and HC-SR04 Ultrasonic Sensors: An IoT-Based Approach”. Journal of Experimental and Applied Physics 2 (4). https://doi.org/10.24036/jeap.v2i4.76.