Library Visitor Noise Monitoring System Design With Warning Using LED and Telegram. Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics, [S. l.], v. 6, n. I, p. 50–59, 2023. DOI: 10.15408/fiziya.v6iI.34280. Disponível em: https://journal.uinjkt.ac.id/al-fiziya/article/view/34280. Acesso em: 21 dec. 2025.