>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 18 May 2005 03:01
>To: Microcontroller discussion list - Public.
>Subject: [EE] Detecting vehicles by magnetism
>
>
>PICers,
>Looks like I might have an actual job in spec - hah! I'd need 
>to detect moving vehicles, I'd guess via their magnetism. 
>Probably need to detect presence + direction of travel. Anyone 
>had experience with devices for magnetic vehicle detecting 
>that they'd wish to share? I'm mentally kicking round 
>Honeywell's MR detectors. Are there other types on the market? 
>Any tips most appreciated Thanks - Debbie.


I guess some more details on the application (if possible) would be
helpfull.  With the explosive growth of speed cameras here in the UK,
there are several different technologies in current use for vehicle
speed and direction detection.

Inductive loops in ground
Piezo cables in ground
Radar
Laser
ANPR Automatic Number Plate Recognition (or License plate for non UK
readers).

We now have a network of plate reading cameras on major roads throughout
the UK ("TrafficMaster") that is currently used for traffic congestion
monitoring, though it's potential for (mis)use for detcting speeding
drivers or simply for surveilance is surely tempting the powers that be.
However, it shows that the technology must now be relatively
inexpensive.

Regards

Mike

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