Alkausar, Vicky Mora, and Irma Husnaini. “Perancangan Vending Machine Menggunakan Uang Kertas Berbasis Arduino”. JTEIN: Jurnal Teknik Elektro Indonesia 2, no. 2 (July 17, 2021): 142–147. Accessed September 26, 2026. http://jtein.ppj.unp.ac.id/index.php/JTEIN/article/view/139.