(Fwd) Revisit Speed/radar
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Posts: 46,084
Hello, again.
I sent messages earlier about using a sonar and stamp for speed
or radar speed checking. One person posted a response but I was
unable to follow up due to my son's health concerns.
I am needing code and math to use to use a polaroid sonar for
speed checking. I already have the sonar working to measure
distance and I just need to know how to use a series of ping/return
cycles to measure speed of an approaching object.
One ping gives time (a) another ping gives time (b) so what would
be the formula to determine the speed by the difference?
Thanks again.
DS
P.S. the person posted a response about a Nuts & Volts article
about this. Where can I get a copy of this article?
End of forwarded message
I sent messages earlier about using a sonar and stamp for speed
or radar speed checking. One person posted a response but I was
unable to follow up due to my son's health concerns.
I am needing code and math to use to use a polaroid sonar for
speed checking. I already have the sonar working to measure
distance and I just need to know how to use a series of ping/return
cycles to measure speed of an approaching object.
One ping gives time (a) another ping gives time (b) so what would
be the formula to determine the speed by the difference?
Thanks again.
DS
P.S. the person posted a response about a Nuts & Volts article
about this. Where can I get a copy of this article?
End of forwarded message
Comments
>>I am needing code and math to use to use a polaroid sonar for
>speed checking. I already have the sonar working to measure
>distance and I just need to know how to use a series of ping/return
>cycles to measure speed of an approaching object.
You should be able to determine both disatnce and radial velocity in
just one ping if you can determine the return frequency and see the
Doppler shift.
I do not know what you need, but the Nuts & Volts articles can be found in
the download section at Parallax's
web site.
Having Fun !!
Dale Fleischmann
veewee77@a... wrote:
> Hello, again.
>
> I sent messages earlier about using a sonar and stamp for speed
> or radar speed checking. One person posted a response but I was
> unable to follow up due to my son's health concerns.
>
> I am needing code and math to use to use a polaroid sonar for
> speed checking. I already have the sonar working to measure
> distance and I just need to know how to use a series of ping/return
> cycles to measure speed of an approaching object.
>
> One ping gives time (a) another ping gives time (b) so what would
> be the formula to determine the speed by the difference?
>
> Thanks again.
>
> DS
>
> P.S. the person posted a response about a Nuts & Volts article
> about this. Where can I get a copy of this article?
>
>
End of forwarded message
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feet in one mile. If you are measuring the distance they travel in a set
amount of time (one second, feet per second), you can convert this to mph by
multiplying by 3600 (seconds/hour), then divide by 5280 (feet/mile) = mph.
So the difference in distance (distance at first measurement-distance at
second measurement) divided by the time gives you ((feet per second) *
(3600))/5280= Miles per hour.
Jim
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