The EV3 Gyro Boy model developed by LEGO builds on the Segway designs of the numerous LEGO hobbyists. Not only does Gyro Boy balance itself using a Gyro Sensor, but it also takes commands using the Ultrasonic Sensors and the Color Sensors.

The mechanical design for Gyro Boy has many impressive features. The building designs for Gyro Boy can be found embedded in the Educational Edition of the EV3 software. If you have the Home Edition of the software, you can download the building instructions from various websites such as RobotSquare by Laurens Valk at http://robotsquare.com/. The design is well balanced and comes with a color-coded stand to get the robot started and send color commands to the robot. There is also a medium motor in the model that can be used to move the arms of the model. The medium motor uses the Technic Knob Wheel as a type of crown gear to control both arms. One arm has a Color Sensor attached to it, and the other arm has the Ultrasonic motion sensor...