The build began as a simple two-motor, skid-steer RC car build with a fan for suction. Controlled by a smartphone app, a cheap Arduino board with an HC-05 Bluetooth module ran the show.

The scrap board wouldn’t move any motors though, so it was time to narrow down the issue. The RC car board has a 128KHz oscillator, and scoping that has shown the issue – it was producing ...

Once you add Legos into the mix, the development of fine motor and organizational skills, as well as instruction-following, ...