That sensor will tell you if there is infrared motion in the range of the sensor. It will not tell you if a person is in the room, sitting very still (or sleeping). It will not tell you how many people are in the room.
What is your real requirement?
That sensor will tell you if there is infrared motion in the range of the sensor. It will not tell you if a person is in the room, sitting very still (or sleeping). It will not tell you how many people are in the room.
What is your real requirement?