<![CDATA[Unmonitored waste accumulation can cause environmental pollution and health risks, especially in campus environments with dense daily activities. This research developed the “Smart Waste Bin,” an IoT-based system that monitors trash bin conditions in real time. The system uses an ultrasonic sensor to measure the height of the waste and a NodeMCU ESP32 as the main controller. Data is displayed on an LCD and sent to a monitoring website and Telegram application for notifications. The system classifies waste levels into three statuses: Empty (1–11 cm, green), Nearly Full (12–20 cm, yellow), and Full (21–30 cm, red). It also includes an automatic lid operated by a servo motor. When the bin is full, the lid remains closed to prevent overflow and maintain cleanliness. Testing showed the prototype successfully detected bin status and sent notifications with 90–93% accuracy. However, the system heavily depends on stable internet connectivity. Overall, it effectively enhances waste monitoring using IoT integration]]>
