Dear Russell McMahon,

> OK.
> Many (most?) modern speedometers are electronically
> analog driven.
> Add a pot and a comparator to monitor this signal
> and you can tell when a
> given speed is exceeded. A suitable caution can be
> sounded. Add a PIC and
> you could have a unit which checks all common speed
> limits and sounds
> different distinctive tones once when each of the
> limits is exceeded by more
> than a certain amount for a certain period. This way
> the tome for eg 20 or
> 30 kph does not sound continuously when travelling
> at eg 50 kph. When the
> highest allowable legal speed is exceeded by more
> than a certain amount the
> appropriate tome could sound continuously or a and a
> speed reduction  signal
> could be applied to the auto's system if the speed
> were exceeded
> continuously for more than a certain period. This
> should pretty much meet
> the above objectives.
>
> Is this what you had in mind ? :-)

Many thanks for reply.

Not realy,
my idea is use GPS LON/LAT COORDINATE for exactly the
pleace where the device must warn me on that
particular road/place/area.

So a simple RAM or whatever needed to store about 2000
positions is needed   ..i think.

A extra option could be a speedlimit warning function
like you discribe.

But my main idea is store de LON/LAT of all the 2000
camera location into memory, when drive toward the
camera, at 200meters ahead,
the divice give a warning signal i notice my
speedlimit.

( 50>80km/h = 250 meters aboeve 80km/h > 500 meters )

A simple pice of PC based software to edit the LON/LAT
and speedlimit and load into memory by user himself,
is needed.

The PIC read LON/LAT from GPS RECEIVER
and look into memory for matching LON/LAT.
When find match,
it wil give alarm with SOUND(piezo) and/or light
(LED).

Bertus.


__________________________________________________
Do You Yahoo!?
Find a job, post your resume.
http://careers.yahoo.com

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.