“Analysis of the Use of HC-SR501 PIR and HC-SR04 Ultrasonic Sensor in Arduino Uno-Based Waste Place Control and Monitoring System with Internet Access (IoT)”, BEAM, vol. 3, no. 2, pp. 21–24, Nov. 2024, Accessed: Nov. 07, 2024. [Online]. Available: https://beam.pmu.edu.my/index.php/beam/article/view/177