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 ...

The legs are retractable and are actuated by tiny servo motors inside the body. [Greg06] even included an ultrasonic distance sensor for the obstacle avoidance mechanism. Honestly, if it weren’t ...