I was just thinking and had a couple of ideas. First of all if i decided i wanted the robot to follow IR light then if i replaced the photocells with IR detectors, and then used a TV remove or something to control it would this work?
Second of all i belive there are spare microcontroller ports or chips or wtv (the connectors) left on the sensors and servos side of things, could these be used as a $50 expansion (obviously with a slightly modified code)?
Third, is it possible using the thing above that i could make some of the extra servo's remote controlled or would this need some type of reciver instead of using a microcontroller?
(You can post some cool expansion ideas too if u like =D)