Solar panels are an amazing piece of engineering, but without exactly the right conditions they can be pretty fickle. One of the most important conditions is that the panel be pointed at the sun, a… ...

An Arduino Nano was chosen as it was low power, low cost, and easy to modify. A L298N h-bridge drives the motors, and a shunt is used instead of limit switches to reduce costs further.

I think the designers explain it better. B-Squares is a 3D modular, Arduino-compatible solar-based tool for artists, educators, inventors, and really anyone who makes things.