Azizi, Muhammad Izham Fikri, and Nordiana Azlin Othman. “Piezoelectric Shoe Energy Harvesting With IoT Monitoring System”. Evolution in Electrical and Electronic Engineering, vol. 3, no. 2, Nov. 2022, pp. 888-94, https://publisher.uthm.edu.my/periodicals/index.php/eeee/article/view/8487.