On the software end, the Arduino code is pretty simple ... the garbage can is outfitted with a servo inside the bin for opening and closing the lid, an ultrasonic sensor in front of the bin ...

To supply targeting data for the launcher, an Arduino Uno uses an ultrasonic sensor pair mounted atop a servo. As the servo rotates, the returns from the ultrasonic sensor are plotted on a screen ...

With a standard old HC-SR04 ultrasonic sensor, an audio module and a servo to drive a custom gauge ... for anyone who has a bunch of these little Arduino-compatible modules lying around and ...