muhamad husni bin samsuni samsuni and M. F. Shaari, “Development of Vending Machine Operation System Using Programmable Logic Controller (PLC)”, peat, vol. 2, no. 1, pp. 930–936, Jun. 2021, Accessed: Jul. 18, 2024. [Online]. Available: https://penerbit.uthm.edu.my/periodicals/index.php/peat/article/view/979