I have an Arduino ATMEGA328 and want to input a PIR motion senor into it, which will control a camera..... any input upon how this should be done....?
This is the motion sensor that I have in mind.... it says that it can be input directly into a microcontroller....
This really comprehensive tutorial from ladyada should tell you all you need to know.
Your sensor is not the same one as in the tutorial, but it appears to be similar. Both are 5V input, digital output.
I don't know what the CDS pin on your datasheet is for, though.