I have three sensors mounted on the ceiling, they all behave the same.

If the array goes empty and I place a piece of foam core on top of my head the array fills up.

It seems odd that the array is not empty until someone is standing under it. So you're saying the sound shooting down at a person will not bounce back?

I see the same behavior whith quiet mode turned off.

I have a ceiling mounted Sonar Phidget pointing straight down. Looking at the control panel while not standing under it, I see the sonar reflections array has two or three elements and the reported distance is 2230 mm,about the distance to the floor. When I stand under the sensor the reflections arr...