Miftahurrohman, Asni Tafrikhatin, sumarah J, El Vionna Laellyn Nurul Fatich. Design and Construction of a NodeMCU-Based Heart Rate and Blood Oxygen Level Monitoring Device with Blynk Application Output. E-Komtek [Internet]. 2026Jan.12 [cited 2026Apr.18];9(2):642-50. Available from: https://jurnal.politeknik-kebumen.ac.id/E-KOMTEK/article/view/2927