The document describes a smart bin system that uses an Arduino, ultrasonic sensor, and GSM modem to automatically alert waste collection authorities when a bin reaches capacity. The ultrasonic sensor measures waste levels in the bin and notifies the Arduino. The Arduino then sends a text message via the GSM modem to notify authorities. This allows for more efficient collection of full bins and prevents overflow. The system aims to improve waste management and reduce health and environmental issues associated with overflowing bins.