On 2/17/06, Bob Axtell <engineer@cotse.net> wrote:
> Tim N9PUZ wrote:
>
> >I'm researching options for measuring distances in a wet, outdoor
> >environment. The task is to measure the distance between two drive
> >units on a boat. The drives both propel and steer the boat.
> >
> >Ideally I will end up with an indicator for the crew that sits at "0"
> >when the drives are a certain distance apart and will go positive or
> >negative from center if the drives are misaligned. The boat has
> >provisions for trimming the positions of each drive from the cockpit.
> >
> >I'm looking for options to consider to do the actual distance sensing.
> >Water will occasionally splash around the sensor locations and since
> >the drives will be running there will be vibration. I do not know the
> >exact target distance right now but it is approximately 7.5 feet. The
> >drives have places where sensors, etc. could be mounted starting about
> >a foot behind the transom and out to about 5 feet or so on to the
> >drive assemblies.
> >
> >Tim
> >
> >
> That should be easy with ultrasonic sound. The pulse is sent, and the
> echo tells distance.

And the wind speed and with a little struggle the wind direction as I saw on
one of my friends project. Not talking about temperature and humidity
which are included in the distance...

Vasile

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