Sasmojo, Duta Widhya, Wisnu Broto, and Doni Chesa Renaldi. 2021. “DETECTION AND MONITORING SYSTEM ON THE PACKAGE RECEIVING BOX”. Spektra: Jurnal Fisika Dan Aplikasinya 6 (3), 151 -58. https://doi.org/10.21009/SPEKTRA.063.02.