Panggabean JF. Design and Manufacture of Number of People Counting Devices Using the AT89S52 Microcontroller. JICT [Internet]. 2022 Apr. 30 [cited 2026 Apr. 28];13(1):47-50. Available from: https://www.ejournal.marqchainstitute.or.id/index.php/JICT/article/view/18