ISWANDII, D.; TRIAYUDI, A.; HANDAYANI, E. T. E. Electronic Alarm Uses Arduino with Ultrasonic Sensor and MP3 Module as the School Bell Time at Kemala Bhayangkari Delog Vocational School: Electronic Alarm Uses Arduino with Ultrasonic Sensor and MP3 Module as the School Bell Time at Kemala Bhayangkari Delog Vocational School. Jurnal Mantik, [S. l.], v. 4, n. 1, p. 843-849, 2020. Disponível em: https://iocscience.org/ejournal/index.php/mantik/article/view/862. Acesso em: 6 oct. 2025.