[Guilherme Martins] rose to a challenge to build a robot with a single servo. His robot is a puppet controller, called talkie walkie. In real time, it will move its mouth to the sound of what you are ...

Robot lawnmowers can be extremely pricey, even at the lower end of the market, setting you back quite a few hundred dollars. If you would prefer to make your own and learn a little more about Arduino ...