How impressive is this? It's how to build what is described as a fully-functional microscope using Arduinos and a Raspberry Pi. There's also LEGO and 3D printing in the mix.

Locomotion is supplied by a Lego Power Function motor controller. He cut an LPF extension wire in half so that he could patch into the PWM signals without altering the motors themselves.

A Stack Exchange post on a brick’s “clutch power” leads to a 10-day experiment.