Some readers may recall building a line-following robot during their school days. Involving some IR LEDs, perhaps a bit of LEGO, and plenty of trial-and-error, it was fun on a tiny scale. Now imagine ...

A robot that follows its owner like a pet, runs errands, and steps forward like a bodyguard to fend off threats is a so-called ‘user-following robot (Follow-Me Robot).’ In parts of China, ball-shaped ...