Mulia A, Subagio S, Ritonga WA. Implementation of NodeMCU ESP8266 Microcontroller for Teacher Attendance System at SMK Swasta Pemda Rantauprapat. u-net [Internet]. 2025Mar.15 [cited 2026Sep.29];8(2):10-2. Available from: https://ejurnal.univalabuhanbatu.ac.id/u-net/article/view/848