Low-Cost Class Room Attendance System using STM32 Microcontroller. International Journal of Engineering & Extended Technologies Research (IJEETR), [S. l.], v. 8, n. 2, p. 1312–1318, 2026. DOI: 10.15662/IJEETR.2026.0802090. Disponível em: https://ijeetr.com/index.php/ijeetr/article/view/482. Acesso em: 21 apr. 2026.