Hi,
James Cameron wrote:
>Ideas wanted.  I live on a farm, and would like the approach of =
vehicles
>announced in two houses.  But I don't want to have false triggers =
caused
>by thunder, cows, sheep, kangaroos, or insects.
<snip>

BTW this really should be [EE:], atleast at the moment as no one has =
suggested
using a plasma core with jiggawatts yet.


This will probably work very well:
http://www.semiconductors.philips.com/pip/KMZ10C.html

Some general info:
http://www.semiconductors.philips.com/acrobat/various/SC17_GENERAL_MAG_2.=
pdf

Particulary look at page 68 'Example 2 Traffic detection':
Here's a taste:
"The sensor modules also proved sensitive enough to
detect and distinguish motorbikes (even with engine,
frame and wheels being made of aluminium), which
produced the following roadside spectra."

I.e. it's possible to detect even which type of vechicle, with enough =
data
collection one should be able to detect speed and make of the car to ;)
And as a bonus they even placed the sensor at the side of the road in =
one test
(instead of under the middle of the road).
Hey maybe it's possible to store the spectra (curve) from each 'known' =
vehicle and 'annouce'
even who, instead of 'someone', is comming :)

Also there is an extention to the family, whic is intriguing for =
detecting vehicles :)

http://www.semiconductors.philips.com/pip/KMZ52.html

"The KMZ52 is an extremely sensitive magnetic field sensor, employing =
the magnetoresistive effect of thin-film permalloy. "

/Tony

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body