zamri, Aidil. “Perancangan Mesin Penyangrai Kopi Tipe Rotari Berbasis Mikrokontroler Arduino”. Jurnal Teknik Mesin 16, no. 1 (June 1, 2023): 92 - 96. Accessed April 29, 2024. https://ejournal2.pnp.ac.id/index.php/jtm/article/view/1081.