[Discuss] Not L or U But at Least Techie...

[bogstad at pobox.com (Bill Bogstad)]

On Mon, Mar 17, 2025 at 1:06?PM Kent Borg <kentborg at borg.org> wrote:
>
> On 3/17/25 5:46 AM, markw at mohawksoft.com wrote:
> > Come to think of it, you could even hook up a camera to send a picture. In
> > fact, you may not need the infrared sensor at all, you could use the video
> > camera and some motion detection software. There are a few available in
> > raspbian.
>
> A camera is what I am trying to replace, sort of.
>
> Yes, it is extremely valuable to be able to see a picture, but motion
> sensing based on that picture can be far too twitchy, particularly when
> there is sunlight and wind and moving shadows. I try aiming the camera
> more and more narrowly and as I reduce the alerts (slightly) the picture
> becomes far less useful. But, if what I want to know about warm-blooded
> critters (including humans), a passive IR detector should be great.

I seem to recall that most digital camera sensors detect IR, UV, and
visible light.
I have pointed IR remotes at digital cameras and saw the beam blinking on
the camera display.   You MIGHT be able to change the filters on a
cheap digital camera
to block visible/UV and have an IR camera.  Justa thought.

Bill Bogstad