Light Detector Circuit

Built a motion sensor circuit using a light sensor. The sensor is more sensitive to changes in light than a particular movement or speed. Just need to figure out the differentiator circuit, which will allow a light sensor to change to speed or direcion of a motor. Today i was able to get both devices communicating and responding to each other. The motion circuit activates the turtle, which in turn activates the motors from its own circuit board. Because both devices are hooked up to a relay, once the turtle activates, the hand activates 8 seconds later. Which in turn reactivates the turtle because of the new motion detector circuit recognizing the movement of the hand. A loop is created, the devices almost continue activating off off each other. There timing is a bit off, maybe i need to use the 555 timer. We will see tomorrow.