[youtube:http://youtu.be/xoY2TlxyWm4]

Who needs a doberman? A team of students from Marin County Day School built a mobile robot with a sentry gun that responds to its environment. It works in automatic mode or by remote control, and features omnidirectional wheels and infrared sensors. It’s a work in progress, and the Parker, Dylan, James, and Ben are already figuring out how to improve nearly every component.