Safrianti, Ery, Feranita, Nurhalim, and Wahyu Dwi Reza. “Design of PH Measuring Equipment for Liquid Waste from Coal Mining Using Arduino Uno”. International Journal of Electrical, Energy and Power System Engineering 5, no. 3 (November 1, 2022): 61-66. Accessed December 9, 2024. https://ijeepse.id/journal/index.php/ijeepse/article/view/110.