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we have decided that rather than the many door sensors ideas that we have like other groups, we have gone with the missing object alarm. This alarm will be passively playing alarm sound and use the the built in compass as a detector of magnetism. If there is a magnetic signal, then the alarm stops. In theory, the alarm should only play when the object with the magnet is moved. This is a missing object sensor that can be used like how they are in movies, we can even set it up to send a notification if it is moved.