Re: My latest cool DIY automation idea

["Robert Green" <ROBERT_GREEN1963@xxxxxxxxx>]

"E. Lee Dickinson" <lee@xxxxxxxxxxxxxxxxxxxxx> wrote in

<stuff snipped>

> Finally figured it out, and it was so elegant.  Every entry and exit to
the
> parking garage has two IR beams, spaced six inches from eachother.
Whichever
> beam is broken first indicated the directon of travel. Car goin in, add
one.
> Car going out, subtract one.
>
> Same would work in a door jamb, put it about 3 feet up so it misses pets,
> but detects (many) children, and doesn't count adult legs as two people.

I wonder if there's enough space to mount two LEDs and two detectors?  I was
going to use the pressure mats to make direction of motion estimates, but a
dual IR beam would work as well as long as I could tell which fired first.

> Of course, this can't account for people jumping out of windows, beaming
up,
> or falling through transdimensional rifts. But after all, this is DIY...

Chronoton detector.

--
Bobby G.

"Schrödinger's cat-litter box. If you don't observe it, you won't have to
change it."