I have several motion sensors and those that cover bright sunlit areas with moving shadows such as a driveway partially shaded with a blowing in the wind tree. I would get lots of notices only minutes apart.
I noticed that some lenses for PIR motion sensors were translucent instead of a dark color, and wondered if a mask made of translucent plastic such as used in milk bottles would dampen the Wyse motion sensor’s sensitivity? I found that the milk bottle material would pass infrared light from a tv controller. Although human eyes cannot see the infrared emitted by a tv controller, most cell phone cameras can. My cell phone camera picked up the controller infrared passing through the milk jug plastic. This is no guarantee that this plastic material would work for what I wanted.
The next step was to tape a piece of milk jug over one of my motion sensors to see what happens.
The motion sensor for the back patio picks up a lot of roaming cats at night, but cat images dropped to zero while still sensing me as I would enter the patio area and was about 15’ from the sensor.
My testing of moving shadows on a hot surface was cut short today because clouds moved in and frequent notifications stopped. Testing should resume tomorrow and I will check back with the results. The group of photos below shows the trial testing.
The next group of photos shows how I made the mask.
Now that I have spent this time heat forming, maybe I should have folded the four sides and creased them in the jaws of a vise. No wood blocks or heat gun needed.