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PICList Thread
'ph and CO2 measurers? [OT]'
1998\03\25@115812 by Geoff Wootton

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Don't know how true it is, but I thought various agencies like the CIA
automatically monitored net traffic, scanning it for keywords like "drugs"
"cannabis" etc, so that the mail could be flagged for investigators.

Keith, you've just blown Rob Walkers operation out of the water - he'll
shortly be paid a visit.

Geoff.

P.S.  How's your Heroin synthesis operation working out.


On Wed, 25 Mar 1998, Keith Howell wrote:

>
> Hmm... call me Mr. Cheeky if you like, but you're not trying to set up
> a cannabis growing establishment are you? I've seen ads for hydroponics
> kits, usually selling halide lamps, etc. Somebody's got to want a plant
> really badly if they want to force-feed it light and carbon dioxide.
>
> So, what are you up to?
>

1998\03\26@064208 by Adrian Gothard

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At 16:57 25/03/98 +0000, you wrote:
>Don't know how true it is, but I thought various agencies like the CIA
>automatically monitored net traffic, scanning it for keywords like "drugs"
>"cannabis" etc, so that the mail could be flagged for investigators.
>
>Keith, you've just blown Rob Walkers operation out of the water - he'll
>shortly be paid a visit.

This why I have a special sig file for that purpose:

Adrian

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Regards

Adrian

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1998\03\27@172315 by paulb

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Keith Howell wrote:

> I'm curious as to why anyone would wish to grow anything
> hydroponically in a country with the climate of a greenhouse.  Most of
> the population is coastal and water is not _that_ scarce.

 Arguably so.

> Hmm... call me Mr. Cheeky if you like, but you're not trying to set up
> a cannabis growing establishment are you? I've seen ads for
> hydroponics kits, usually selling halide lamps, etc. Somebody's got to
> want a plant really badly if they want to force-feed it light and
> carbon dioxide.

 I have to confess to a bit of a giggle when I see those huge mercury-
vapour lamps and hydroponics stuff at garage sales.  My other *big*
giggle is people trying to sell Kodak "Colourburst" instant cameras for
money!

 As to CO2, well I *hope* I know what I'm talking about.  You may
exhale 5% CO2, but that's because your body is trying to get RID of it,
and the 5% parallels the amount in your blood.  That is to say CO2 in
exhaled breath is at equilibrium with the blood, breathing is
deliberately controlled in rate and tidal volume to remove only as much
as necessary.

 If you were to breathe IN 10% CO2, you'd have to breathe out 15% to
get rid of the same amount, wouldn't you, and because what you breathe
out cannot be less than the amount in your blood (whilever your lungs
are working, that is!), that'd mean you had THREE TIMES as much as you
should in your bloodstream.

 Now, in fact, the body *does* try to control the amount of CO2 in the
blood fairly carefully.  Normal is 36-44 torr, out of one atsmosphere =
760 torr, so 5% is pretty close.  A person with severe chronic
respiratory failure might just head toward half as much again, and yes,
they do adapt over time but they'd be pretty snoozy.  The feeling of
asphyxia is more closely related to oxygen lack, but if *you* breathe 5
to 7% CO2 even on high O2, you will feel pretty crook pretty fast.  More
than that is just not on!

 All this is at sea level, and equivalent partial pressures at lowered
atmospheric pressure of course apply.  Spacecraft tend to use pure
oxygen at 1/5 atmosphere and remove as much CO2 as possible (I seem to
recall a major problem on MIR some time ago - sleepy cosmonauts!).

 Cheers,
       Paul B.

1998\03\27@222022 by Alberto Smulders

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Try

    http://www.patents.ibm.com/boolquery.html

with query

   carbon dioxide AND measure

I got 1133 matching patents..... (some irrelevant, but I've seen also
"hydroponics" somewhere in the list...)

Regards,

Alberto A. Smulders
InSAD - Encarnaci—n, Paraguay
insadspamKILLspamitacom.com.py
{Original Message removed}

1998\03\30@213253 by Robert Walker

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To one and all,


       Thanks for those that contributed to my dilema,


       Contrary to what some believe Australia is not quite a green-house,
       thanks to el-nino, I have not seen rain for 4 months!

       And for those that are a bit cheeky, have a good look at Hydroponics
       and Aqua-culture, you may see that there is plenty of scope for
       developing PIC related products, and of course getting into the
       business.

       Why bother with growing dope, when a legitimate business growing
       food can be made, after all we all have to eat! The population is
       getting bigger, and farming in the tradtional sense is becoming more
       and more difficult.

Just food for thought,


Robert
Australia.

1998\03\31@063952 by Keith Howell

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Hi Robert.

I see - you don't need to keep plants away from soil or policemen,
but you need to be thrifty with water. And from what I recall,
Oz has a lot of insects that will eat anything (even floor coverings!)

It is (largely) a desert environment. The middle east has similar
problems: even if you do apply loads of water it might flush buried salt
into the topsoil, poisoning it.

What is your food crop/environment?
You might have a good market for a PIC that can keep a greenhouse
optimal for different veggies, fruit, etc.
If you had a few high-value plants, a PIC might monitor each one.
If doing away with soil completely, it might also be used to
monitor/control the nutrient level.

1998\03\31@111535 by Tom Handley

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At 12:15 PM 3/31/98 +1000, Robert wrote:
[snipped out of context]
>        Why bother with growing dope, when a legitimate business growing
>        food can be made, after all we all have to eat! The population is
>        getting bigger, and farming in the tradtional sense is becoming more
>        and more difficult.

  But Robert, "Dope will get you through times of no money better than
money will get you through times of no dope!" For those of you who remember
that line from the Fabulous Furry Freak Brothers, report to your local
`Natural Guard' and turn yourselves in, and on ;-)

>        And for those that are a bit cheeky, have a good look at Hydroponics
>        and Aqua-culture, you may see that there is plenty of scope for
>        developing PIC related products, and of course getting into the
>        business.

  Robert, I'd like to hear more about your work. I live in Oregon (zone 7)
and I've been interested in hydroponics but I never had time to do much with
it. I know folks that have been growing vegies and herbs. They use to grow pot
but that was long ago before kids and responsibility came along... This spring
I'm putting in a water pond and I want to use a PIC to drive the pump and
manage power to the pump from a DC supply, battery, and solar panel. I also
want to use a PIC for hydroponics to grow vegies in the winter. Another PIC
application is garden irrigation. Until around three years ago, I spent most
of my adult life in the country and on a farm. I now live in Portland, OR.

  - Tom

>Just food for thought,
>Robert
>Australia.


'ph and CO2 measurers? [OT]'
1998\04\04@010708 by Lauw Lim Un Tung
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hi all,

Motorola've chemical sensor. Have you try their MGS1100 sensor?
Search at http://www.motserv.indirect.com/


Un Tung

1998\04\04@062156 by Russell McMahon

picon face
The link given didn't work for me but here is one which
describes the MGS1100 - this is a Carbon Monoxide sensor -
intended as the first in a family of semiconductor gas
sensors.

http://www.apspg.com/whatsnew/060197/sense.html


From: Lauw Lim Un Tung <.....tungKILLspamspam.....PETER.PETRA.AC.ID>
To: EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU <PICLISTspamspam_OUTMITVMA.MIT.EDU>
Date: Saturday, 4 April 1998 18:07
Subject: Re: ph and CO2 measurers? [OT]


>hi all,
>
>Motorola've chemical sensor. Have you try their MGS1100
sensor?
>Search at http://www.motserv.indirect.com/
>
>
>Un Tung
>

1998\04\05@010700 by Orin Eman

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face
> The link given didn't work for me but here is one which
> describes the MGS1100 - this is a Carbon Monoxide sensor -
> intended as the first in a family of semiconductor gas
> sensors.

> http://www.apspg.com/whatsnew/060197/sense.html

It's dead.  Work down to Chemical Sensors from http://www.motorola.com
and there is a memo saying Motorola ain't doing chemical sensors
no more.

Orin.

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