We have covered a bunch of cool robots you can buy to play with. Building your own robots can also be gratifying. Robot Geek has posted a guide that shows you how to build a desktop RoboTurret with a foam dart gun and Pixy. The robot automatically tracks down and fires upon enemies.
You are going to need a Pixy camera module, RobotGeek pan/tilt base, foam dart gun, and Geekduino to get started. More information is available here.
What do you think? How would you improve this robot?