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'[PIC]: Speedtrap warning device using any GPS rece'
2001\11\03@143255 by

So all he needs is a PIC which will take the current location, output by
the GPS, and calculate the distance to a known set of points, triggering
an alarm when a trap is within .5km or something?

Since the distances are so small, one could even ignore the great circle
equations, and go straight to the square root of the sum of the squares
of the differences in latitude and longitude.  Could probably perform a
few tricks there as well using tables, or by alarming when both lat and
long are within one mile of the trap's lat and long.  Since the GPS only
updates every second, it'd have a full second to compare the current
position with the table of traps, which is plenty of time.

The hardest part, in fact, would probably be the serial reception and
NMEA parsing, and deciding how to store the trap coordinates.

Of course, it would be better to use APRS and a radar detector so you
could warn others of mobile speed traps you find as well.

Nick Ray wrote:

{Quote hidden}

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> So all he needs is a PIC which will take the current location, output by
> the GPS, and calculate the distance to a known set of points, triggering
> an alarm when a trap is within .5km or something?
>
> Since the distances are so small, one could even ignore the great circle
> equations, and go straight to the square root of the sum of the squares
> of the differences in latitude and longitude.  Could probably perform a
> few tricks there as well using tables, or by alarming when both lat and
> long are within one mile of the trap's lat and long.  Since the GPS only
> updates every second, it'd have a full second to compare the current
> position with the table of traps, which is plenty of time.
>
> The hardest part, in fact, would probably be the serial reception and
> NMEA parsing, and deciding how to store the trap coordinates.
>
> Of course, it would be better to use APRS and a radar detector so you
> could warn others of mobile speed traps you find as well.

Alternatively you could try obeying the speed limit.

********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olinembedinc.com, http://www.embedinc.com

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Do, or do not.  There is no try.

Olin Lathrop wrote:

>Alternatively you could try obeying the speed limit.
>

--

> Olin Lathrop wrote:
>
> >Alternatively you could try obeying the speed limit.
> >

> Do, or do not.  There is no try.

Perfection may be the aim.
All probably fall short of the mark.
An honest try seems to work most of the time.

I think even the most socially aware of us have manage to exceed posted
limits on occasion.
It may be that there are administrations who ARE out to mainly gather money
and who ARE totally unreasonable in their policing but at least in this
country, if you honestly try to observe speed limits at all times, the end
result is approximately no tickets for speeding, over a 30 + year period -
based on a sample of 1. I in fact did receive a speeding ticket on a
motorcycle (and I was speeding *) and they let me off on receipt of my
written explanation. Being able to say that the officer concerned had
complimented me on my riding ability after I lost him in corners (at less
than the speed limit) (as I avoided his unmarked car's attempts to run me
off the road) no doubt helped my case :-).

I find motor vehicles indispensable. However, on the subject of perfection
and driving, I concluded long ago that if Jesus Christ were to have
physically lived in this era then he would not drive a motor vehicle. The
alternative's seem to be to either to break the law consciously and
repeatedly or to drive in such a careful manner as to annoy many others and
to cause them to do worse than they otherwise would have. Neither choice
seems acceptable if observance of the letter and spirit of the law is
desired. As driving one's self is not a necessity it would seem to be better
to not do it.

regards,

Russell McMahon

(* - there's a little more to this story which makes it almost amusing. In
the most unlikely event that anyone wants to know ask offlist).

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I think it is astonishing the extent and expense that
people will go to detect or defeat radar.
It's much easier to just drive under the speed limit.
It's low stress, low cost and considering the efforts
to avoid a ticket, saves time.
Sandy Phelps

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I not able to remember over 2000 locations inside
Netherlands only.
Within Germany there are also around 2000 camera
loctions.
I know in UK and FR the use the same (GATSORADAR)
cameras.
Not sure how many there are.
Most time you know there is a camera on the road,
but where is it stand exacly...?
FLITS/FLASH  oeps there it was......

I think only the LON/LAT will do the trick.
All these info is present i the GPS \$GPRMC string.
In \$GPRMC is also, heading and speed over ground.

The only GPS NMEA string needed,
look like its the \$GPRMC...
The rest of the GPS, could be rejected.

Bertus.

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At 10:28 AM 11/4/01 -0800, Sandy Phelps wrote:
>I think it is astonishing the extent and expense that
>people will go to detect or defeat radar.
>It's much easier to just drive under the speed limit.
>It's low stress, low cost and considering the efforts
>to avoid a ticket, saves time.
>Sandy Phelps

If it was always deployed for speed enforcement, instead of revenue
enhancement, maybe people would feel differently.  When I got tagged in
Hawaii, I was, according to the officer's testimony, out of his sight
around a corner, and over the crest of a hill, and just one car in five
lanes of traffic. Additionally, his position was only a few hundred yards
from the aircraft carrier enterprise (they commonly run high powered radar
in port), and under a flight path where aircraft are landing, with weather
radar operating in the same band as his speed gun.

Additionally, I wasn't speeding, but none of that mattered.

After I brought out all this in court, the judge explained to me that in
his "radar court" (yes a special court, with special rules, just for us)
the only admissible testimony would come from the arresting officer, and
the radar gun manufacturer, who was not present.

They wave the gun, you pay the fine, see the cashier on the way out.

This incident also resulted in my arrest for contempt of court, a charge
that I heartily agreed with.

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> I know in UK and FR the use the same (GATSORADAR)
> cameras.
> Not sure how many there are.
> Most time you know there is a camera on the road,
> but where is it stand exacly...?
> FLITS/FLASH  oeps there it was......
>
Why don't you just lobby your government like the
boy racers in the UK did. Now all the Speed Cameras are
to be painted in high visibility colours and sign
posts are to be erected warning you of this road hazard
Giving you sufficient distance to slow down before you get
to them.

Chris Carr

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Dear Olin Lathrop,

You are 100% right about that, afcourse.

Here in NL there are over 2000 !! yes 2000 af those
speedtraps.
These cameras get to action when your drive 3 Km/h
near 2 mph to fast......
Do you view your speedometer at alltimes ?
I must honiest say, iam not .....

And thit is only a idea to find out if is technical
possible.

Maby we give it more friendly name to please veryone
like, "GPS WAYPOINT RECOVERY UNIT".... =:)

But this is other discussion i dont like to discus
overhere.

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> Here in NL there are over 2000 !! yes 2000 af those
> speedtraps.
> These cameras get to action when your drive 3 Km/h
> near 2 mph to fast......
> Do you view your speedometer at alltimes ?
> I must honiest say, iam not .....

Serious suggestion: An accurate audible warning speedometer alarm seems like
a sensible option in such cases. This would not stop you speeding but would
warn you so that you would never do it by accident. Such a device is
trivially easy to build for most speedometers. A little complexity would
allow pleasant brief tones repeated only occasionally to prevent annoyance
if ongoing above-limit driving was desired. Then at least the problem
mentioned above would not exist.

Russell McMahon

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