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Room safety is very important considering that the crime scene is very disturbing to the public, one of which is the usual theft case. This might be caused partly because of economic factors that cause people to sometimes take shortcuts to make ends meet by stealing. So the PIR sensor sensor tool was made to detect human movements making it easier for us to control security when leaving a room empty, the media used is Mobile, by utilizing SMS facilities. The purpose of this research is thedoi:10.32493/informatika.v5i3.5706 fatcat:risiu3cqdzfuvdqimli24q6idi