and is fitted with a Lego “fretboard” of sorts. A slide is moved up and down the fretboard by the player. The EV3 controller detects the position of the slide via an ultrasonic sensor ...

They are roughly the size of a soccer ball and utilize CO2 thrusters and ultrasonic sensors to move around ... platforms such as Arduino and LEGO Mindstorms EV3, which makes for an easy transition ...