This instructable will use three photoresistors (light dependent resistors) and an Arduino to control the motion of a robot. Any common robot chassis can be used for the robot. The light sensors will be mounted on the left side, right side and front of the robot. When light of sufficient intensity falls on a sensor, the robot will respond with a left turn, right turn or forward movement, corresponding to the location of the sensor that is activated. The instructable will also pass along some electronics tips that I have found useful and, hopefully, will prove useful to others.