I went to the museum a few weeks ago and they had these exhibits where when you step in front of them a video starts playing and lights turn on and off on different artifacts in front of you as the video talked about them.

It looked like the way they were doing it was just using a photobeam mounted above where it tells you to stand and they glued the little mirror onto the floor. So when you stood on that spot you blocked the mirror and then they had something start up the video and control the lights. You could probably do something like that and then the homeowner won’t have to make sure he hits a pad to get the lights to work.