You can get tables or charts like this:
http://www.lordgrey.org.uk/~f014/usefulresources/aric/Resources/Teaching_Packs/Key_Stage_4/Weather_Climate/images/02d.jpg
How you read it?
- Check 25degC - see the line is at about 23g/m3
This means at 25degC the air can contain maximum 23g/m3 vapour. This
Is there a formula behind "seal 25Celsius 70% humidity air in, and cool
that down to 10Celsius, you will have about 9grams of condensation per
cubic meter"?
Volume of the largest bilge compartment is about 6 cu. ft. or roughly 0.2
cu. meter., so about 2 grams condensation.
Typical warm July, afte
I think some of the other posts are probably simpler and more
appropriate, but if you did want to use a Pi here is a link to a plant
watering system that uses the resistance between 2 probes in the soil to
measure soil moisture.
http://www.raspberrypi.org/archives/4327
On 09/07/13 07:31, Vaj
If you seal 25Celsius 70% humidity air in, and cool that down to 10Celsius,
you will have about 9grams of condensation per cubic meter of air.
In my view this is not too significant. You only will have problems, if
fresh humid air can enter, and more water condensens from the fresh air.
You can c
Good points.
All surfaces have at least two coats of epoxy. We may glass the interior
surfaces as we have the exterior of the hull. If we use glass on all
surfaces the process is: apply a thin seal coat of epoxy. Dry. apply
another coat of epoxy, then immediately the glass, followed by a liberal
co
Looks like you have a nice project going. However, I'm going to guess that
no matter what you do, you are going to have liquid water inside the
compartments if you seal them shut.
Why? Unless you are building the boat in a desert in winter, you will be
sealing in relatively warm and humid air insi
Unless they live under that rock :)
Hearing real applications for OWFS is a large part of the fun of this
project!
Paul
On Mon, Jul 8, 2013 at 11:43 AM, Peter Hollenbeck wrote:
> All surfaces have a sealer coat of epoxy, followed by a layer of
> fiberglass cloth adhered with two layers of epo
All surfaces have a sealer coat of epoxy, followed by a layer of fiberglass
cloth adhered with two layers of epoxy. There is virtually no possibility
of water entering the plywood - unless we hit a rock at cruising speed (10
knots). Even that would be unlikely to breach the hull.
I'm apologize to
On 7 July 2013 22:47, Peter Hollenbeck wrote:
> How would I probe? The compartments are sealed.
I was thinking that if the chamber was wet inside then probing the
wood on the exterior would show damp seeping into the wood. That may
not be true though, depending on the material used.
Are you sur
I'm sure this is the solution to implement.
I know almost zero about electronics but am always looking for fun things
to do with 1wire and Raspberry.
Thanks again,
Peter
On Sun, Jul 7, 2013 at 5:34 PM, Jerry Scharf wrote:
> Peter,
>
> KISS says use a multimeter, I started with the 1-wire solu
Peter,
KISS says use a multimeter, I started with the 1-wire solution because
that was the thread. This will work fine but I have to admit the sugar
cube seems even nicer. Again, measuring with a multimeter is all it takes.
They make wire that is specifically designed to prevent water ingress
How would I probe? The compartments are sealed. Whatever solution I finally
adopt there will be at least two wires from each bilge compartment leading
to the areas above the floor (deck). The wires will be sealed so that they
don't provide a passage for water.
If anyone is interested, here is our
On 7 July 2013 22:03, Rob Kapteyn wrote:
> My reliable low-tech solution to this has been to use a microswitch with a
> rubber band around it, held open by a sugar cube.
> It is best to use the normally closed contacts.
> When there is enough water to dissolve the sugar cube, the lever moves in
>
My reliable low-tech solution to this has been to use a microswitch with a
rubber band around it, held open by a sugar cube.
It is best to use the normally closed contacts.
When there is enough water to dissolve the sugar cube, the lever moves in
and opens the contacts.
This might also be useful as
Just one note: pay attention to the insulation on the wire. Using general
pvc insulated wire will cause a leak itself. Best would be to embed some
stainless bolts, and connect wires to them using nuts and washers on the
exterior side.
Vajk
On Sun, Jul 7, 2013 at 9:18 PM, Jerry Scharf wrote:
>
>> Elegant solution. Would I need a computer? Could I just do it with a
>> multimeter?
Yes indeed. If it was me, I would solder a two-conductor cable onto two nails
and drive them, say, an inch apart somewhere in the bottom of the compartment,
and run the cable back to some place where I could
On 7 July 2013 21:05, Peter Hollenbeck wrote:
> Elegant solution. Would I need a computer? Could I just do it with a
> multimeter? I love my Raspberry Pis but maybe one isn't required in this
> case.
Would you be better just with a cheap moisture meter [eg 1] and probe
it from the outside occasio
Elegant solution. Would I need a computer? Could I just do it with a
multimeter? I love my Raspberry Pis but maybe one isn't required in this
case.
"If I understand the job right, doesn't that mean that you will be doing major
surgery to dry the compartment and solve the water ingress issues?"
Abs
It wouldn't matter if salt water destroyed a moisture sensor. I would take
occasional readings of the 7 compartments. Any reading other than
"completely dry" would mean I would have to cut an inspection hole in that
compartment and address the problem.
Thanks again,
Peter
On Sun, Jul 7, 2013 at
On 07/06/2013 08:40 AM, Peter Hollenbeck wrote:
> I am building a 26 foot wood power boat. The bilge below the cabin and
> afterdeck floor is 7 sealed water tight (hopefully) compartments. I
> plan no inspection ports but would like a way to detect moisture. If
> there were an appropriate sensor
On Sun, Jul 07, 2013 at 04:21:17PM +0200, Jan Kandziora wrote:
> Another possible method working with both water and non-polar liquids is
> checking the dielectrical permittivity, same method as a capacitive
> touchscreen uses. There are really cheap ICs for that purpose out there,
> but they all
Am 07.07.2013 17:24, schrieb Peter Hollenbeck:
> Could I use leaf wetness sensors such as this:
> http://www.hobby-boards.com/store/products/Leaf-Wetness-Sensor.html
>
Should work for a while, at least as long the bilge is dry. Once
seawater gets in contact with the board I think it has to be repla
Am 07.07.2013 17:00, schrieb Peter Hollenbeck:
> I like the idea of using cheap ICs. Can you suggest one for me to consider?
>
For your application, I cannot recommend any.
Kind regards
Jan
--
This SF.net emai
Could I use leaf wetness sensors such as this:
http://www.hobby-boards.com/store/products/Leaf-Wetness-Sensor.html
?
Peter
On Sun, Jul 7, 2013 at 8:00 AM, Peter Hollenbeck wrote:
> I like the idea of using cheap ICs. Can you suggest one for me to consider?
> Thank you,
> Peter
>
>
> On Sun, Jul
I like the idea of using cheap ICs. Can you suggest one for me to consider?
Thank you,
Peter
On Sun, Jul 7, 2013 at 7:21 AM, Jan Kandziora wrote:
> Am 07.07.2013 15:49, schrieb Peter Hollenbeck:
> > I don't really understand why that works,
> >
> Usually, there is air between the heater and hea
Am 07.07.2013 15:49, schrieb Peter Hollenbeck:
> I don't really understand why that works,
>
Usually, there is air between the heater and heat sensor. This will heat
the sensor, but only marginally as
* heat conduction through air is nearly always insignificant
* heat convection through air is ins
why not one of those ?!?
http://www.fuchs-shop.com/download/MultiSensor_Manual_V091028.pdf
this page is from germany but you should be able to get these anywhere else ...
regards,
marcus
Peter Hollenbeck schrieb:
>I don't really understand why that works, but I could certainly do it.
>Thank
I don't really understand why that works, but I could certainly do it.
Thanks for the suggestion.
Peter
On Sun, Jul 7, 2013 at 5:01 AM, Jan Kandziora wrote:
> Am 07.07.2013 02:13, schrieb Peter Hollenbeck:
> > Stuart Island, British Columbia
> >
> > Interesting idea.
> > Ocean water temperature
If we build it right the bilge should be bone dry so I guess I would want
to detect moisture.
Peter
On Sun, Jul 7, 2013 at 12:11 AM, Colin Law wrote:
> On 7 July 2013 01:13, Peter Hollenbeck wrote:
> > Stuart Island, British Columbia
> >
> > Interesting idea.
> > Ocean water temperature here i
Am 07.07.2013 02:13, schrieb Peter Hollenbeck:
> Stuart Island, British Columbia
>
> Interesting idea.
> Ocean water temperature here is about 10C and air temperature, when we are
> here April through October, ranges from about 10 to 20. I will have to
> experiment to see if the differential would
On 7 July 2013 01:13, Peter Hollenbeck wrote:
> Stuart Island, British Columbia
>
> Interesting idea.
> Ocean water temperature here is about 10C and air temperature, when we are
> here April through October, ranges from about 10 to 20. I will have to
> experiment to see if the differential would
Stuart Island, British Columbia
Interesting idea.
Ocean water temperature here is about 10C and air temperature, when we are
here April through October, ranges from about 10 to 20. I will have to
experiment to see if the differential would be a reliable indicator. It's
difficult to say what the te
W dniu 06.07.2013 o 17:40 Peter Hollenbeck pisze:I am building a 26 foot wood power boat. The bilge below the cabin and afterdeck floor is 7 sealed water tight (hopefully) compartments. I plan no inspection ports but would like a way to detect moisture. If there were an appropriate sensor I could
Am 06.07.2013 17:40, schrieb Peter Hollenbeck:
> I am building a 26 foot wood power boat. The bilge below the cabin and
> afterdeck floor is 7 sealed water tight (hopefully) compartments. I plan no
> inspection ports but would like a way to detect moisture. If there were an
> appropriate sensor I c
I am building a 26 foot wood power boat. The bilge below the cabin and
afterdeck floor is 7 sealed water tight (hopefully) compartments. I plan no
inspection ports but would like a way to detect moisture. If there were an
appropriate sensor I could embed one in each compartment and occasionally
hoo
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