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This paper introduces a low-cost, STM32 microcontroller-based smart waste bin that automates lid opening via ultrasonic proximity sensing and servo motor control. A second ultrasonic sensor monitors the internal waste level, providing real-time feedback on an OLED display. Experimental results demonstrate fast response time and stable sensing, enabling touch-free waste disposal.
A simple, low-cost smart waste bin design achieves touch-free operation using commodity STM32 microcontrollers and ultrasonic sensors.
The increasing demand for hygienic and contactless solutions in public and private environments has encouraged the development of automated systems for everyday applications. This paper presents the design and implementation of a motion- sensing automatic waste bin using an STM32 microcontroller, ultrasonic sensors, and a servo motor. The system detects user presence through ultrasonic sensing and automatically opens the bin lid using a servo motor controlled by the microcontroller. An additional ultrasonic sensor is used to monitor the internal waste level of the bin, while an OLED display provides real- time feedback regarding system status. The proposed system offers a low-cost, reliable, and easily deployable solution for touch-free waste disposal. Experimental evaluation demonstrates fast response time, stable sensing performance, and smooth mechanical operation. The system can be effectively deployed in homes, educational institutions, hospitals, and public facilities to improve hygiene and user convenience.
