An Arduino is used to determine the servo’s current position versus the desired position, and it turns the motor accordingly with a BTS7960 motor driver.

Posted in Android Hacks Tagged arduino, bubble, bubbles, servo ← Modest Motor Has Revolutionary Applications NFL To Experiment With Chipped Balls → ...

Powered by 3D-printed parts and servo motors, it's controlled by an Arduino Mega board. Still a work in progress, Cogley plans further improvements.