Thames & Kosmos Robotics: Smart Machines Science Kit This kit gives kids a simple, fun, and customizable introduction to robotics that lets them build eight motorized machines. Requires a tablet or smartphone Using the app interface, you can program the robots you build to behave based on the feedback coming from the ultrasound sensor. A full-color, 64-page step-by-step illustrated manual helps kids assemble all of the models and teaches them about robotics in the real world. The ultrasonic sensor works on the same principle as sonar.