Re: Ultrasonic Sensors

["rgondzur" <rgondzur@xxxxxxxxx>]

I would be monitoring outdoor landscaped areas. They could contain
ponds, waterfalls, ...
They will vary in size and shape so there is no well-defined perimeter
that is consistent from one installation to the next. The perimeter
will more often than not be finished with stone or concrete rather than
natural grass and soil.

Infra red barriers would be an option if the shape of the perimeter was
symmetrical but it will often not be that way.

Per my previous post, I was thinking of trying ultrasonics mounted at
the perimeter of the inner circle, pointing toward the outer circle. I
would have to space them close enough so their sensing patterns overlap
to guard the entire perimeter.