With just one wire, an Arduino, and some really neat code, [peter] can ... in the video after the break, the servo knows its position thanks to an internal potentiometer on the motor’s rotor.

On the software side, things are just as straightforward. The code includes two Arduino libraries: one for the servo and another for the ultrasonic sensors. The main code is a simple 14-line piece ...

and is controlled using the included Arduino’s Servo Library. The code is simple too and I’ll try to explain it after this video where I made a short presentation of the project in action.