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Human activity sensor detects the gap between the room and human
body of temperature. The available range may differ depending on
the surrounding temperature, clothes, etc. Human activity sensor may
mistakenly detect the heat source such as direct sunlight, animals (dog,
cat, etc.), warm air from air conditioner, heater, electric pot, etc.
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Sideways or lengthways movement can be detected easily, but back
and forth movement or a slight movement may not be detected strictly.
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Human activity sensor may not work properly when there is a reflecting
object (mirror, etc.) in the available range or any objects between the
human activity sensor and person.
