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'[OT]: Anyway to design a circuit to predict weathe'
2001\11\11@194146 by Tan William

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Dear All,

Is there anyway circuit that can be build to predict
the weather is going to rain?

Pls help ....

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2001\11\11@200318 by Tony Nixon

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Tan William wrote:
>
> Dear All,
>
> Is there anyway circuit that can be build to predict
> the weather is going to rain?
>
> Pls help ....

If you find one, sell it to the weather bureau. I think they rely on
thier computer models too much these days, and forget about looking out
their windows occasionally.

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2001\11\11@201022 by cdb

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Electronically connected seaweed is the answer. When I return to the Old
Dart I'll be at the seaside doing my research.

Seaweed ,Silicon and Chips must be a connection somewhere!

Colin

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2001\11\11@204601 by M. Adam Davis

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There are two reasonable ways:
1) Sustian a war injury, grow old, and press a button when it 'acts up'.
2) Hire some elder who has such an injury and have them press the button.

There are no 'sure signs' of rain, but you can always use an internet
attached PIC to read off the percentage chance of rain from your
favorite web site and sound the warning if the percentage is above a set
point.

There are simply to many unknowns and too many factors.  Meteorologists
with satellites, weather ballons, and ground sensors (radar, etc) can't
tell weather accurately within an hour.

Of course, if you mean to sell these in seattle, you can just wire it 'on'.

-Adam

Tan William wrote:

{Quote hidden}

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2001\11\12@005444 by Brooke Clarke
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Hi William:

The best single station forecasting method that I have found is the "Sager
Weather Caster".  I have some info on it at:
http://www.pacificsites.com/~brooke/Weather.shtml  The accuracy may be improved
by basing the lookup table on your local conditions.
The book works best on the East Coast, but I used it in the S.F. bay area and it
worked fine.

Have Fun,

Brooke

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2001\11\12@032221 by Mike Blakey

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This is easy, simply place an LED on the desk, if it illuminates with no
connections to it, this indicates that it will NOT rain in the next 24 hours. This
device is 97% reliable in the UK !






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Dear All,

Is there anyway circuit that can be build to predict
the weather is going to rain?

Pls help ....

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2001\11\12@033503 by gtyler

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I saw one in an Elector mag some time back, only worked in Britain. It was
basically a simple circuit, just a flat battery and an led across it. If the
led lights it is not going to rain. They claimed something like 80% accuracy
if I remember correctly!

{Original Message removed}

2001\11\12@034735 by Jinx

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> This is easy, simply place an LED on the desk, if it illuminates with
> no connections to it, this indicates that it will NOT rain in the next 24
> hours.  This device is 97% reliable in the UK !

Only 97% ? Nice to know the weather is clearing up over there at last

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2001\11\12@055759 by Alan B. Pearce

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>Seaweed ,Silicon and Chips must be a connection somewhere!

Fish and sand come to mind ;)

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2001\11\12@092048 by Micro Eng

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UK rain thing was based upon humidity.  Suppose the best way to detect if
its going to rain, is to have a series of sensors, ring like configuration
at some distance from you, say 10 miles.  Each sensor will monitor relative
humidity, wind, moisture, etc. Then each sensor system is polled and a host
computer looks at each unit and relates the data to indicate a rise in
humidity, temp lower, etc. Then it can continue and then if the water sensor
is activated it is pretty much assured that you might get rain in a while.
Sounds rather complicated tho....


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2001\11\12@172501 by uter van ooijen & floortje hanneman

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> Is there anyway circuit that can be build to predict
> the weather is going to rain?

Here in Holland the prediction formula:
  int rain_tomorrow( void ){ return 1; }
works quite well. In most other countries
  int rain_tomorrow( int rain_today ){ return rain_today; }
might work better, often it fails only two times each year. It said that in
some unfortunate countries
  int rain_tomorrow( void ){ return 0; }
has performed amazingly well the last few years.

Wouter van Ooijen

Van Ooijen Technische Informatica: http://www.voti.nl
Jal compiler for PIC uC's:  http://www.voti.nl/jal

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2001\11\13@001045 by Erik Hall

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Sure,

Take a PIC (any model), connect up a suitable crystal and put it outside.
Look at the circuit in the morning. If it is:

...wet, then it is raining.
...white, then it is snowing.
...melted, then it is real hot outside.
...etc.

=)

-Erik

{Original Message removed}

2001\11\13@163514 by Peter L. Peres

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Mike Blakey <spamBeGonemike.blakeySTOPspamspamEraseMEBAESYSTEMS.COM> wrote:

> This is easy, simply place an LED on the desk, if it illuminates with no
> connections to it, this indicates that it will NOT rain in the next 24
> hours. This device is 97% reliable in the UK !

This method works here too! In our case the indication is inverted, if it
illuminates, then it indicates that it will rain! And it is more accurate
than in the UK ;-) ;-).

Peter

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2001\11\13@165930 by David Huisman

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Here in Australia it is a little different, not only do we know it is going
to rain but we can control when and how much it will rain.

All we do is wash the car and it rains. The amount of rain is proportional
to the amount of effort we put into cleaning the car.

Regards

David Huisman

{Original Message removed}

2001\11\13@173850 by Alexandre Domingos F. Souza

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>Here in Australia it is a little different, not only do we know it is going
>to rain but we can control when and how much it will rain.
>All we do is wash the car and it rains. The amount of rain is proportional
>to the amount of effort we put into cleaning the car.

       In Brazil, is the same...


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2001\11\13@184733 by David Venz

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After the recent rain here in Brisbane (Australia), I was considering
drawing some markers up the inside of my car and retiring it as a
rain-gague.  Man I hate the smell of wet carpet.  Time to get out the
silicone glue again....   <g>


DH wrote:









Here in Australia it is a little different, not only do we know it is going
to rain but we can control when and how much it will rain.

All we do is wash the car and it rains. The amount of rain is proportional
to the amount of effort we put into cleaning the car.

Regards

David Huisman

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2001\11\13@205158 by Russell McMahon

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> Here in Australia it is a little different, not only do we know it is
going
> to rain but we can control when and how much it will rain.
>
> All we do is wash the car and it rains. The amount of rain is proportional
> to the amount of effort we put into cleaning the car.


New Zealand:

New Plymouth

   If you can't see the mountain (Taranaki) it is raining.
   If you can see the mountain then it is going to rain.

Westland (wet-land), Chatham Islands

   If it's not raining then someone has made a mistake.
   This will be remedied VERY shortly.

Auckland

   Rains quite a lot. Mainly at weekends.

Wellington

   Rains less than Auckland but the rain comes in horizontally.

Generally

   Usually rains somewhere here about 2 or 3 days after the Aussie's wash
their cars.

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2001\11\15@152342 by brandon

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I dont know if your question ever got answered, but,
how accurate do you want?
Barometric pressure is actually a good way to predict if it is going to rain. I know the accuracy would deffenitly be much greater than 50% (if 50% is ok, use a coin).

You could hook up a little digital barometer to a comparator, and if the pressure drops enough (low pressure=rain, high=no rain), then a light could come on or whatnot.

This is how it was done in the home for decades (most of our grandpas had them).

"These pressure differences have a big effect on the weather, so if you know the current air pressure at your house, as well as the pressure trend, you are able to predict certain things about the weather. As a very loose rule, a high-pressure area will be clear, and a low-pressure area will be cloudy and rainy. " (http://www.howstuffworks.com/question13.htm)

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2001\11\15@154237 by Brent Brown

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> I dont know if your question ever got answered, but,
> how accurate do you want?
> Barometric pressure is actually a good way to predict if it is going
> to rain. I know the accuracy would deffenitly be much greater than 50%
> (if 50% is ok, use a coin).

I noticed this week that the foil lid on a large size "noodles in a
bowl" bulges up significantly when the atmospheric pressure drops
just before rain. Appears consistent no matter what the flavour. Add
a microswitch, battery and buzzer (and anti-theft device) and there
you have it. Should only be about a 2 minute job...

Brent Brown
Electronic Design Solutions
16 English Street
Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile/text: 025 334 069
eMail:  EraseMEbrent.brownspamEraseMEclear.net.nz

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2001\11\15@155431 by Dale Botkin

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> I noticed this week that the foil lid on a large size "noodles in a
> bowl" bulges up significantly when the atmospheric pressure drops
> just before rain. Appears consistent no matter what the flavour. Add
> a microswitch, battery and buzzer (and anti-theft device) and there
> you have it. Should only be about a 2 minute job...

Of course the accuracy would likely depend on what the weather was like at
the factory when it was produced!  On the plus side, you'v got something
warm to eat while it rains.

Dale

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2001\11\15@164344 by steve

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> I noticed this week that the foil lid on a large size "noodles in a
> bowl" bulges up significantly when the atmospheric pressure drops just
> before rain. Appears consistent no matter what the flavour.

Good to see you have found an alternative to watching the grass
grow. Which is the bigger rush ? :-)

One solution we were going to use for a robotic telescope that lives
out in the middle of nowhere, was to have rain detectors at several
points around the compass and some distance from the telescope.
They were to be equipped with little radio transmitters and when
they detected rain, would radio the telescope and it would shut
down. Since it was looking at the sky and would shut down if it
was cloudy anyway, the main situation we were concerned about
was a frontal band.

Steve.

======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
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2001\11\15@164610 by Bob Blick

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On Fri, 16 Nov 2001, Brent Brown wrote:
> I noticed this week that the foil lid on a large size "noodles in a
> bowl" bulges up significantly when the atmospheric pressure drops
> just before rain. Appears consistent no matter what the flavour. Add
> a microswitch, battery and buzzer (and anti-theft device) and there
> you have it. Should only be about a 2 minute job...

Wow, it also doubles as an emergency food source, wonder if the
manufacturers thought of that :-)

Cheers,

Bob

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2001\11\19@225342 by David Venz

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Update for anyone who likes a chuckle....

I recently had the opportunity to confirm DH's theory below (YMMV outside
Australia):  I cleaned and de-odourised the inside of my car on the weekend
(to get rid of the wet carpet smell), and it promptly became overcast and
rained and filled up the floor-trays within 3 hours.  I may need to combine
the input of a water-level meter and my odometer to get accurate rainfall
readings, since I get more water intake when I drive on rainy days.  Have
to hand-enter the "amount of effort" as well (see DH below).

*sigh*

-Dave.




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After the recent rain here in Brisbane (Australia), I was considering
drawing some markers up the inside of my car and retiring it as a
rain-gague.  Man I hate the smell of wet carpet.  Time to get out the
silicone glue again....   <g>


DH wrote:









Here in Australia it is a little different, not only do we know it is going
to rain but we can control when and how much it will rain.

All we do is wash the car and it rains. The amount of rain is proportional
to the amount of effort we put into cleaning the car.

Regards

David Huisman

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