I recently read an article that mentions Bill Gates gives visitors a pin (sensor) that his home computer/controller can use to track their whereabouts in his house.
X-10 Motion sensors can detect when someone enter their field of view. Are they sensitive enough to detect someone sleeping on the sofa if they don't move, except to breath?
I'd like to be able to figure out who they are and exactly where in the room they are.
There are several ways of sensing someone. You could measure the displacement of air, detecting them by their volume. Put weight sensors in an array beneath the carpet, detecting them by their weight. Measure the change in heat of the room. Listen for sounds they make. Sense their smell. Have an array of invisible laser beams criss crossing the room for them to break. And so on.
What are your (anyone?) ideas on how any X-10 products might be used to track and identify in a home?