Amir, Ashadi, et al. “Development of a Microcontroller-Based Waste Sorting System for Metal and Non-Metal Classification Using an Inductive Proximity Sensor”. International Journal Of Electrical Engineering And Intelligent Computing, vol. 3, no. 2 June, Aug. 2026, pp. 72-81, doi:10.33387/ijeeic.v3i2 June.12538.