Smart Mini Spirometer Monitoring System Based on ESP32 and MQTT Communication Protocol. Al-Fiziya: Journal of Materials Science, Geophysics, Instrumentation and Theoretical Physics, [S. l.], v. 8, n. 2, 2026. DOI: 10.15408/fiziya.v8i2.50212. Disponível em: https://journal.uinjkt.ac.id/index.php/al-fiziya/article/view/50212. Acesso em: 20 oct. 2026.