Bong, Zhen Ting, Kim Seng Chia, and Abu Ubaidah Shamsudin. “Air Filter Dust Level Sensing System Using Fuzzy Logic”. International Journal of Electrical Engineering and Applied Sciences (IJEEAS) 1, no. 2 (October 26, 2018): 33–40. Accessed April 19, 2024. https://ijeeas.utem.edu.my/ijeeas/article/view/4494.