Inside the BeatBot an Arduino reads 9 infrared sensors for line detection at 100 samples a second. A digital servo controls the Ackerman steering mechanism to follow the line on the track or floor.

Perhaps the most charming is Ozobot, a tiny robot that follow lines drawn on screens or paper — it's a simple concept that's surprisingly fun.

An Arduino-based robot for people who don’t know how to build robots "Sparki" ideal for teaching kids (or adults) how to program robots.