You might want to think twice before installing any of those devices. We just built a new town hall, equipped with all the latest technology – automatic flushing toilets, motion sensing lights, etc. and have found that they aren’t a panacea.
We have already replaced one room with a standard toggle switch for lights. We were unable to adjust the sensor to stay on when someone was using the room (it often shut off without warning) or to turn off when no one was there (it was often already on when we opened the room). Ostensibly, the intention was to save electrical costs, but not only was it a holy hassle, but it probably cost us money after all.
Also, when you walk into a dark bathroom, you have to hesitate before taking another step to give the sensor time to turn stuff on. Just a second or so, but it’s against human nature to walk into a room blindly and hope you will get some light before you crash into the wall or another person. So we either hesitate or yell something, like “geronimo!” before pushing the door.