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Re: [PSUBS-MAILIST] Water depth sensing?

To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Water depth sensing?
From: Warren Greenway <opensourcesub@yahoo.com>
Date: Tue, 24 Feb 2004 08:29:00 -0800 (PST)
In-reply-to: <001201c3f89e$646ef3a0$c18e403e@steveduron>
Reply-to: personal_submersibles@psubs.org
Sender: owner-personal_submersibles@psubs.org

The only real difference is the point of reference for
the sensors. You would want an absolute sensor for
sensing depth/pressure for a sub. Gauge often means 
the same thing as absolute, differential will have two
sensor inputs and read the difference between the two.
Try the datasheets for the sensor you are interested 
in. Usually the datasheet will have some standard 
interface circuits and information. Also, get TI 
application notes book for the MSP430...Even if you
are
using any MCU. It has great circuits and algorithms
for reading various common sensors.

Warren.

normaly means that there will be t
--- steve <steve@kobol.worldonline.co.uk> wrote:
> another question on the subject if i may.
> i have heard there are three different types of
> sensor available: absolute,
> differential and gauge.
> i have an idea what the differential type does but
> what about the other two?
> what should i be looking for to get a linear 0 - 5v
> or 0 - 10v output i can
> feed to an A to D converter?
> 
> Best Regards
> 
> Steve Bosworth
> UK
> 
> ----- Original Message -----
> From: "Steven Mills" <cirtemoeg@juno.com>
> To: <personal_submersibles@psubs.org>
> Sent: Saturday, February 21, 2004 7:41 AM
> Subject: Re: [PSUBS-MAILIST] Water depth sensing?
> 
> 
> >
> > Steve, here are a few links that I recall.
> >
> > http://members.cox.net/igalysh/pressure.html
> >
> >
> > 
>
http://www.parallax.com/html_pages/resources/custapps/app_underwater.asp
> >
> > I have many more sources, but the case and hinge
> on my laptop cracked a
> > few
> > months ago [ no video ] so I'm starting over with
> the searches/sources
> > [and
> > everything else !  ]
> > When I come across anything significant I'll post
> it.
> >
> > --Steve
> >
> >
> > On Sat, 21 Feb 2004 02:16:40 -0000 "steve"
> > <steve@kobol.worldonline.co.uk> writes:
> > > anything helps, thanks.
> > > i had originally considered the low tech
> approach but as the project
> > > progresses i keep moving the boundaries.  in one
> way i actually know
> > > it
> > > could be done visually but where is the
> challenge?
> > >
> > > steve
> > >
> > > ----- Original Message -----
> > > From: "Al Secor" <wreckdiver@usadatanet.net>
> > > To: <personal_submersibles@psubs.org>
> > > Sent: Friday, February 20, 2004 12:42 PM
> > > Subject: Re: [PSUBS-MAILIST] Water depth
> sensing?
> > >
> > >
> > > > Steve,
> > > >
> > > > I'm using a pressure sensor from Digikey
> (www.digikey.com) for my
> > > rebreather
> > > > controller which uses a PIC processor. Mine is
> a 0-250 psi sensor
> > > which
> > > will
> > > > measure down to about 600 feet but you can get
> them that measure
> > > 0-100
> > > psi.
> > > > The particular sensor I'm using is a
> Measurement Specialties
> > > 2000519.  It
> > > > has a .5-4.5v ratiometric output voltage and
> runs on 5 vdc and a
> > > 1/4" NPT
> > > > pressure port.  The downside is they are
> somewhat pricey....about
> > > $100.00.
> > > >
> > > > Hope this helps....Al
> > > >
> > > > Al Secor  ARS: WA3PWX  Scuba Instructor SSI
> PDIC TDI
> > > > http://www.geocities.com/SubDiverI
> > > > ----- Original Message -----
> > > > From: "steve" <steve@kobol.worldonline.co.uk>
> > > > To: <personal_submersibles@psubs.org>
> > > > Sent: Friday, February 20, 2004 3:37 AM
> > > > Subject: Re: [PSUBS-MAILIST] Water depth
> sensing?
> > > >
> > > >
> > > > > Hi All
> > > > >
> > > > > Unfortunately there is still no sign of the
> Kitteridge book but
> > > i expect
> > > > the
> > > > > US / UK post offices are taking their time. 
> maybe they read
> > > everything
> > > > they
> > > > > send???
> > > > >
> > > > > As part of my ROV project i want to look at
> a way of measuring
> > > the depth
> > > > of
> > > > > my vehicle.  I am toying with a Basic stamp
> 2 at the moment and
> > > wondered
> > > > if
> > > > > anyone had any ideas for a small (i.e.
> cheap) sensor that i
> > > could use
> > > for
> > > > > this purpose.
> > > > > My design spec will only need to measure
> down to 20m in fresh or
> > > sea
> > > > water.
> > > > >
> > > > > anybody got any useful ideas and know where
> i could source one?
> > > > >
> > > > > Best Regards
> > > > >
> > > > > Steve Bosworth
> > > > > UK
> > > > > ----- Original Message -----
> > > > > From: "Dewey Mason" <drmason2001@yahoo.com>
> > > > > To: <personal_submersibles@psubs.org>
> > > > > Sent: Friday, February 20, 2004 1:50 AM
> > > > > Subject: Re: [PSUBS-MAILIST] test of CO2
> safety hardware - any
> > > volunteers?
> > > > >
> > > > >
> > > > > > If tested well, and found to work, this
> could serve as
> > > > > > a backup unit to a commercial device, or
> even just as
> > > > > > a novelty, but I agree in should be looked
> into. My 2
> > > > > > cents.
> > > > > >
> > > > > > Dewey
> > > > > > --- Pierre Poulin <pipo305@hotmail.com>
> wrote:
> > > > > > > Erik,
> > > > > > >
> > > > > > > I will try it. I just need some time. I
> will try it
> > > > > > > mainly for curiousity
> > > > > > > and discution. I think that's all this
> group is all
> > > > > > > about! To get new things
> > > > > > > developed and discussed.
> > > > > > >
> > > > > > > Pierre Poulin
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > >From: Erik Muller <emuller@naic.edu>
> > > > > > > >Reply-To:
> personal_submersibles@psubs.org
> > > > > > > >To: personal_submersibles@psubs.org
> > > > > > > >Subject: Re: [PSUBS-MAILIST] test of
> CO2 safety
> > > > > > > hardware - any volunteers?
> > > > > > > >Date: Wed, 18 Feb 2004 12:23:52 -0400
> > > > > > > >
> > > > > > > >Gail,
> > > > > > > >Many of the points you made are true.
> Let me
> > > > > > > address them one at a time:
> > > > > > > >
> > > > > > > > >I'm wondering how accurate and useful
> a device
> > > > > > > like the one you describe
> > > > > > > >would be.
> > > > > > > >Indeed, as am I. This is why I am
> calling for
> > > > > > > people with air-tight hulls
> > > > > > > >to test the system. I am not suggesting
> that it be
> > > > > > > implemented on anyones
> > > > > > > >machine before testing its efficiency
> and it is
> > > > > > > developed.
> > > > > > > >
> > > > > > > > >With reliable professionally-made
> devices 
=== message truncated ===


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References:
- Re: [PSUBS-MAILIST] Water depth sensing?
  - From: "steve" <steve@kobol.worldonline.co.uk>

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