Wanted to resurrect this thread since now I’m in the same situation. It seems crazy to me that there isn’t some good, inexpensive solution for monitoring every door/window if you’re able to wire it up while all the walls are open. I mean the switches cost next to nothing but then you need to jump through the hoops of putting some hacked-together arduino system in place? Seems strange to me - does nobody do an out-of-the-box solution that can take this bundle of wires and make it live sensibly in a SmartThings or equivalent world?
At this point I’m looking at just using the (very slick!) new Sensative z-wave sensors (https://www.amazon.com/gp/product/B01LWMTUI8/nothingreal) but at $60 a pop that gets pretty expensive when you’ve got a couple dozen doors&windows you’d like to get coverage on.
Any thoughts appreciated! (Either for products to look into or even links to other pertinent blogs/discussions around this subject).