PIR no work :( So back up plan here we go!

Since I can seem to work the PIR sensor with the arduino, I'm going to my back up plan which is using a light sensor (LDR)  to control the forward motion of the RC Car. When the LDR senses light upon it the car will run away from the light and hide in the darkness. When light has struck the LDR an alarm will go off meaning the something is wrong so it has to run away. (If you understand)

Link: http://www.youtube.com/watch?v=kDhAqh1mLc8&feature=youtu.be

Also I was hoping the PIR I ordered would come before hand in but it hasnt so I have to change my plans up: