An EV3-controlled motor powers the whole thing. He also makes use of an obscure part–the 14-tooth bevel gear, last manufactured by LEGO in 2002 ... or 16 teeth, medium-sized ones 20 or 24 ...

Their standard hardware is based on off-the-shelf platforms such as Arduino and LEGO Mindstorms EV3, which makes for an easy transition for school’s existing STEM programs. The current hardware ...