toddj421:
Great! So I will be able to use the same power source (battery pack) to power the Arduino too correct?
Maybe, depending on its capacity. The motor turning on might take the voltage down (dip) to where the Arduino might reset.
toddj421:
Then I can connect the PIR to another output and write the sketch from there?
Connect the PIR's output to an Arduino input.
toddj421:
Also, by what you are saying, you cant control the VIN pin?
"Control"?