Hutahaean Y, Hapsari DS, Rusdiyanto D. Design of a Monitoring Device and System for Measuring Heart Rate, Oxygen Saturation and Body Temperature Based on the Internet of Things (IoT). JTEIN [Internet]. 2025 Feb. 11 [cited 2026 May 16];6(1):1-10. Available from: http://jtein.ppj.unp.ac.id/index.php/JTEIN/article/view/704