From: "Paul V"
References: <email@example.com> <firstname.lastname@example.org>
Subject: Re: Lap timer
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Date: Tue, 3 Dec 2002 15:26:25 +1030
NNTP-Posting-Date: Mon, 02 Dec 2002 23:55:53 EST
The commercial units are out of the question, we are not a professional
from it, so can't warrant the cost associated with such units.
I was thinking along the lines of the IR beam you mentioned.
Actually I thought someone may have already asked for this type of thing so
was planning on it being a ready solution.
I suppose I could pinch one of the speed camera vehicles we have on our
roads......records speed, takes a picture and comes complete with a late
Just haven't worked out what to do with the police officer on the back seat.
Might have to go with the stopwatch for $10, but not the accuracy.
Will keep watching this space. Thanks for the ideas.
"Terry Pinnell" wrote in message
> "Paul V" wrote:
> >I have a friend who does a bit of motorcycle racing and I'm looking for a
> >lap timer which we can use on practice days.
> >Doesn't have to be too fancy, but something simple to setup and
> >accurate would be the go.
> >A hand operated stopwatch just isn't accurate enough.
> Presumably you've looked at commercial units, which I expect are
> I've never tackled such a device, but I'd think it would include a
> manually re-settable counter, with an LED or LCD display, frozen by a
> signal from a sensor. That sensor could take several forms (as well,
> of course, as a push-button in parallel, so that you could use it in
> conventional manner).
> 1. An interrupted IR beam.
> For reliable operation, that might not be a trivial circuit, as it
> would have to reject changing ambient light conditions (both natural
> and artificial, if you expect to race at night). And it would
> obviously only work for solo (or well-spaced) situations.
> 2. An interrupted pressure signal from a tube or hose stretched
> tightly across the surface, like those you see in the road. Shares
> some of the limitations of the above.
> 3. An RF-based system, with a small transmitter on the motor-bike, and
> a receiver close to the finishing line, uniquely tuned to that
> particular bike's frequency or transmission code.
> Terry Pinnell
> Hobbyist, West Sussex, UK