Jam, Mohamad Nur Aiman, Lilywati Bakar, and Zurina Abdul Wahab. “Heart Rate Monitoring Robot by Using Arduino and NodeMCU ESP8266”. Progress in Engineering Application and Technology 3, no. 2 (December 19, 2022): 363–372. Accessed July 18, 2024. https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/6125.