Tools To make the most of the NXT, Lego created many different "tools" which you can use to make your NXT more complex and more fun. These tools that I refer to are as such motors and sensors that help the robot move and run. Here are the main tools of the NXT. The servo motors are the things that make the robot move or walk or drive. The touch sensor makes your robot "feel." It senses when something hits it, bumps it or is released. this sonic sensor makes your robot "see." Using sound waves it measures distances between itself and other objects. this also helps your robot "see". This can tell light from dark. The sound sensor makes your robot "hear." It can react to a sound that is loud or soft. And as always. PLAY WELL!