So I'm looking to do a security system at our house and this is the plan I've come up with (actually came up with three, but chose this one).
All entry doors into house have a contact sensor. Motion in office, two motions in living/kitchen. Contacts on all window shutters in master bedroom and bedroom 3 & bedroom 2. Contact on bedroom 1 & motion sensor since there is no shutter on the window.
D = Door contact sensor
W = Window contact sensor
M = Motion sensor
The goal here is to be alerted of a break in when we are not home and also for safety when we are home sleeping. We would active the motions at night. There are no pets or kids in the house. Will also add a monitored smoke alarm and also a panic button.
I know, seems a bit paranoid, but my wife really wants to do it and it's sort of one of those things that if something happens, it's like "Why the heck didn't we do that security system?" Sort of like not having health insurance or a back up on your computer.