Check out this Color Tracking Hexapod by davidhend in the Robot Shop Forum. The thing is a bit creepy! Not sure if there is a difference in programming but to me the first video looks like something trying to corner some prey and the second is more like a dog excited and ready to go running for a thrown ball. Nice job David.
“I am using the Pixy Cam to detect a pink object, in this case a pen cap, and move the body accordingly. All the PS2 controller functions work exactly as you’d expect; to enter tracking mode I press the triangle button. I am using a micro atmega 328 to connect and calculate the pan/tilt error of the object we are interested in. The height of the object is also obtained and used to determine how far away the object is.”