Hey there. We have a room that's pretty much like a bunker, but above ground: no windows, really thick walls and a door that can be closed shut (http://ift.tt/2iWLF6V). We want to add a light on the outside of the room, that will indicate if someone is inside or not. My idea was to connect that light to motion sensors, but as I mentioned - we can't drill holes or even connect a cable from the inside to the outside. I was thinking of using a raspberry pi, but I don't know if I'm overdoing it. Does anyone here have any experience with something similar? Or an idea how to make it work? via /r/DIY http://ift.tt/2zKyJcu
