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 [Internet]. 2024 Nov. 1 [cited 2024 Nov. 7];3(2):21-4. Available from: https://beam.pmu.edu.my/index.php/beam/article/view/177