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If you are constantly fighting with family members or roommates about turning lights off when they leave a room, automation can help. This isn’t advanced stuff, either: You simply use sensors to detect when someone is or is not in the room. When there isn’t activity, the lights turn off. To start, you need sensors, and there are two types you should look at. The first is a motion sensor, which is exactly what it sounds like. The second is newer—a presence sensor. A presence sensor can tell if you’re just chilling in the room, rather than moving around in it. If you’ve been sitting quietly reading or watching TV, the lights shouldn’t go out on you.