I believe that -passive- infrared detectors (most light switches are
passive) are only triggered by objects emitting heat, such as a person's
body. Active IR detectors emit IR light themselves and might be
triggered by other moving objects.

But in your case, I don't think that the branches will trigger it. But
maybe they might mask movements beneath them... Difficult to tell
without seeing the situation, still there should be line of sight
between the sensor and the person, so no leaves in between.


--
LucKl
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