This is a physical computing learning kit that allows students to build a smart control system in which the lid of a trash can automatically opens when an ultrasonic distance sensor detects a hand approaching within a certain range.

From understanding sensor principles to designing automated actions, this hands-on, real-world-based activity is well-suited for integrated STEM education in elementary and middle school settings.

Distance Detection – Ultrasonic Distance Sensor: When a hand approaches the trash can, the ultrasonic sensor detects the distance and sends a signal to automatically open the lid.

Motor Control – Servo Motor: Based on the signal received from the ultrasonic sensor, the servo motor rotates at a fixed angle to open and close the lid.