Xi, C. T. Y., M. Z. Daud, W. M. Wan Muda, and M. A. Jusoh. “Development of Microcontroller-Based Solar Tracking System Using LDR Sensor”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC), vol. 9, no. 2-7, Sept. 2017, pp. 71-75, https://jtec.utem.edu.my/jtec/article/view/2595.