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Pressure sensor for water tank — Parallax Forums

Pressure sensor for water tank

ArchiverArchiver Posts: 46,084
edited 2003-07-11 16:07 in General Discussion
Hi all,

A friend of mine wants to build a Stamp controller for his nifty home-made
water filtration system. The tank he has is 7 feet deep, and we would like
to be able to determine the water level within a foot or so. I am thinking
of a air type sensor with a tube from top to bottom of the tank. Any
recommendations? 0-5V output, or perhaps a resistive type.

Thanks!

Jonathan

www.madlabs.info

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-07-11 06:50
    HI IN a NUts and VOLts article on STAMPS there was a very neat
    external depth sensing system. You need a plastic tank as it used the
    capacitance change between the water and an external aluminum strip on
    the outside.
    rondoc

    amps@yahoogroups.com, "Jonathan Peakall" <jpeakall@m...> wrote:
    > Hi all,
    >
    > A friend of mine wants to build a Stamp controller for his nifty
    home-made
    > water filtration system. The tank he has is 7 feet deep, and we
    would like
    > to be able to determine the water level within a foot or so. I am
    thinking
    > of a air type sensor with a tube from top to bottom of the tank. Any
    > recommendations? 0-5V output, or perhaps a resistive type.
    >
    > Thanks!
    >
    > Jonathan
    >
    > www.madlabs.info
  • ArchiverArchiver Posts: 46,084
    edited 2003-07-11 06:58
    or a plastic pipe external to the tank with the strip(s) on that :-)

    Air pressure wont work due to the fact the air dissolves into the water over
    time, plus condensation problems
    It can be done, but its not that simple unfortunately!
    Original Message
    From: "rondoc69" <rdoctors@c...>
    To: <basicstamps@yahoogroups.com>
    Sent: Friday, July 11, 2003 3:20 PM
    Subject: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank


    > HI IN a NUts and VOLts article on STAMPS there was a very neat
    > external depth sensing system. You need a plastic tank as it used the
    > capacitance change between the water and an external aluminum strip on
    > the outside.
    > rondoc
    >
    > amps@yahoogroups.com, "Jonathan Peakall" <jpeakall@m...> wrote:
    > > Hi all,
    > >
    > > A friend of mine wants to build a Stamp controller for his nifty
    > home-made
    > > water filtration system. The tank he has is 7 feet deep, and we
    > would like
    > > to be able to determine the water level within a foot or so. I am
    > thinking
    > > of a air type sensor with a tube from top to bottom of the tank. Any
    > > recommendations? 0-5V output, or perhaps a resistive type.
    > >
    > > Thanks!
    > >
    > > Jonathan
    > >
    > > www.madlabs.info
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2003-07-11 08:09
    Well, you know the depth and width of the tank - you could always try

    1) A float and sprung reel. Hook it up to a multiturn pot somehow. Could be
    a tab hokey but it might work.

    2) Ultrasonic - Drill holes along the length of a PVC tube to let water in
    and out. Put an ultrasonic range finder on top then put the tube into the
    tank. Measure the distance to the top of the water and deduct the missing
    volume. Infra-red might work, not sure if water would reflect or absorb it
    though.
    Original Message
    From: "Tim Stockman, STOCKMAN ELECTRONICS"
    <tim.stockman@s...>
    To: <basicstamps@yahoogroups.com>
    Sent: Thursday, July 10, 2003 10:58 PM
    Subject: Re: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank


    > or a plastic pipe external to the tank with the strip(s) on that :-)
    >
    > Air pressure wont work due to the fact the air dissolves into the water
    over
    > time, plus condensation problems
    > It can be done, but its not that simple unfortunately!
    >
    >
    Original Message
    > From: "rondoc69" <rdoctors@c...>
    > To: <basicstamps@yahoogroups.com>
    > Sent: Friday, July 11, 2003 3:20 PM
    > Subject: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank
    >
    >
    > > HI IN a NUts and VOLts article on STAMPS there was a very neat
    > > external depth sensing system. You need a plastic tank as it used the
    > > capacitance change between the water and an external aluminum strip on
    > > the outside.
    > > rondoc
    > >
    > > amps@yahoogroups.com, "Jonathan Peakall" <jpeakall@m...> wrote:
    > > > Hi all,
    > > >
    > > > A friend of mine wants to build a Stamp controller for his nifty
    > > home-made
    > > > water filtration system. The tank he has is 7 feet deep, and we
    > > would like
    > > > to be able to determine the water level within a foot or so. I am
    > > thinking
    > > > of a air type sensor with a tube from top to bottom of the tank. Any
    > > > recommendations? 0-5V output, or perhaps a resistive type.
    > > >
    > > > Thanks!
    > > >
    > > > Jonathan
    > > >
    > > > www.madlabs.info
    > >
    > >
    > > To UNSUBSCRIBE, just send mail to:
    > > basicstamps-unsubscribe@yahoogroups.com
    > > from the same email address that you subscribed. Text in the Subject
    and
    > Body of the message will be ignored.
    > >
    > >
    > > Your use of Yahoo! Groups is subject to
    http://docs.yahoo.com/info/terms/
    > >
    > >
    > >
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2003-07-11 08:19
    You could use a simple preasure gauge from edmund scientific or some place.
    A car oil preasure gauge would be to high preasure, but something along
    those lines should work well, and be very easy to install and read in software.
    -Kerry

    At 12:09 AM 7/11/03 -0700, you wrote:
    >Well, you know the depth and width of the tank - you could always try
    >
    >1) A float and sprung reel. Hook it up to a multiturn pot somehow. Could be
    >a tab hokey but it might work.
    >
    >2) Ultrasonic - Drill holes along the length of a PVC tube to let water in
    >and out. Put an ultrasonic range finder on top then put the tube into the
    >tank. Measure the distance to the top of the water and deduct the missing
    >volume. Infra-red might work, not sure if water would reflect or absorb it
    >though.
    >
    >
    Original Message
    >From: "Tim Stockman, STOCKMAN ELECTRONICS"
    ><tim.stockman@s...>
    >To: <basicstamps@yahoogroups.com>
    >Sent: Thursday, July 10, 2003 10:58 PM
    >Subject: Re: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank
    >
    >
    >> or a plastic pipe external to the tank with the strip(s) on that :-)
    >>
    >> Air pressure wont work due to the fact the air dissolves into the water
    >over
    >> time, plus condensation problems
    >> It can be done, but its not that simple unfortunately!
    >>
    >>
    Original Message
    >> From: "rondoc69" <rdoctors@c...>
    >> To: <basicstamps@yahoogroups.com>
    >> Sent: Friday, July 11, 2003 3:20 PM
    >> Subject: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank
    >>
    >>
    >> > HI IN a NUts and VOLts article on STAMPS there was a very neat
    >> > external depth sensing system. You need a plastic tank as it used the
    >> > capacitance change between the water and an external aluminum strip on
    >> > the outside.
    >> > rondoc
    >> >
    >> > amps@yahoogroups.com, "Jonathan Peakall" <jpeakall@m...> wrote:
    >> > > Hi all,
    >> > >
    >> > > A friend of mine wants to build a Stamp controller for his nifty
    >> > home-made
    >> > > water filtration system. The tank he has is 7 feet deep, and we
    >> > would like
    >> > > to be able to determine the water level within a foot or so. I am
    >> > thinking
    >> > > of a air type sensor with a tube from top to bottom of the tank. Any
    >> > > recommendations? 0-5V output, or perhaps a resistive type.
    >> > >
    >> > > Thanks!
    >> > >
    >> > > Jonathan
    >> > >
    >> > > www.madlabs.info
    >> >
    >> >
    >> > To UNSUBSCRIBE, just send mail to:
    >> > basicstamps-unsubscribe@yahoogroups.com
    >> > from the same email address that you subscribed. Text in the Subject
    >and
    >> Body of the message will be ignored.
    >> >
    >> >
    >> > Your use of Yahoo! Groups is subject to
    >http://docs.yahoo.com/info/terms/
    >> >
    >> >
    >> >
    >>
    >>
    >> To UNSUBSCRIBE, just send mail to:
    >> basicstamps-unsubscribe@yahoogroups.com
    >> from the same email address that you subscribed. Text in the Subject and
    >Body of the message will be ignored.
    >>
    >>
    >> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >>
    >>
    >
    >
    >To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    >from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.
    >
    >
    >Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >
    >
    -Yours with much regard
    -Kerry
  • ArchiverArchiver Posts: 46,084
    edited 2003-07-11 15:12
    On item #2 if the tube is big enough why not float a ping pong ball and use
    it to reflect the ultrasonic.
    Original Message
    From: pm [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=vHEszRgr9oIO7KpVM5Rh3PV0RhHvIvdTqm1A-eEs95TGxkgk4M6rv5wm8H-OcPS-XN5DrF6srRM]pmeloy@s...[/url
    Sent: Friday, July 11, 2003 3:09 AM
    To: basicstamps@yahoogroups.com
    Subject: Re: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank

    Well, you know the depth and width of the tank - you could always try

    1) A float and sprung reel. Hook it up to a multiturn pot somehow. Could be
    a tab hokey but it might work.

    2) Ultrasonic - Drill holes along the length of a PVC tube to let water in
    and out. Put an ultrasonic range finder on top then put the tube into the
    tank. Measure the distance to the top of the water and deduct the missing
    volume. Infra-red might work, not sure if water would reflect or absorb it
    though.
    Original Message
    From: "Tim Stockman, STOCKMAN ELECTRONICS"
    <tim.stockman@s...>
    To: <basicstamps@yahoogroups.com>
    Sent: Thursday, July 10, 2003 10:58 PM
    Subject: Re: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank


    > or a plastic pipe external to the tank with the strip(s) on that :-)
    >
    > Air pressure wont work due to the fact the air dissolves into the water
    over
    > time, plus condensation problems
    > It can be done, but its not that simple unfortunately!
    >
    >
    Original Message
    > From: "rondoc69" <rdoctors@c...>
    > To: <basicstamps@yahoogroups.com>
    > Sent: Friday, July 11, 2003 3:20 PM
    > Subject: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank
    >
    >
    > > HI IN a NUts and VOLts article on STAMPS there was a very neat
    > > external depth sensing system. You need a plastic tank as it used the
    > > capacitance change between the water and an external aluminum strip on
    > > the outside.
    > > rondoc
    > >
    > > amps@yahoogroups.com, "Jonathan Peakall" <jpeakall@m...> wrote:
    > > > Hi all,
    > > >
    > > > A friend of mine wants to build a Stamp controller for his nifty
    > > home-made
    > > > water filtration system. The tank he has is 7 feet deep, and we
    > > would like
    > > > to be able to determine the water level within a foot or so. I am
    > > thinking
    > > > of a air type sensor with a tube from top to bottom of the tank. Any
    > > > recommendations? 0-5V output, or perhaps a resistive type.
    > > >
    > > > Thanks!
    > > >
    > > > Jonathan
    > > >
    > > > www.madlabs.info
    > >
    > >
    > > To UNSUBSCRIBE, just send mail to:
    > > basicstamps-unsubscribe@yahoogroups.com
    > > from the same email address that you subscribed. Text in the Subject
    and
    > Body of the message will be ignored.
    > >
    > >
    > > Your use of Yahoo! Groups is subject to
    http://docs.yahoo.com/info/terms/
    > >
    > >
    > >
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >


    To UNSUBSCRIBE, just send mail to:
    basicstamps-unsubscribe@yahoogroups.com
    from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.


    Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/



    [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2003-07-11 15:19
    Tim,

    Drat! Good point. So do you think IR or sonic is the way to go? IR would be
    easier to protect from the enviroment, but will water reflect IR or absorb
    it?

    Thanks,

    Jonathan
    www.madlabs.info
    Original Message
    From: "Tim Stockman, STOCKMAN ELECTRONICS"
    <tim.stockman@s...>
    To: <basicstamps@yahoogroups.com>
    Sent: Thursday, July 10, 2003 10:58 PM
    Subject: Re: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank


    > or a plastic pipe external to the tank with the strip(s) on that :-)
    >
    > Air pressure wont work due to the fact the air dissolves into the water
    over
    > time, plus condensation problems
    > It can be done, but its not that simple unfortunately!
    >
    >
    Original Message
    > From: "rondoc69" <rdoctors@c...>
    > To: <basicstamps@yahoogroups.com>
    > Sent: Friday, July 11, 2003 3:20 PM
    > Subject: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank
    >
    >
    > > HI IN a NUts and VOLts article on STAMPS there was a very neat
    > > external depth sensing system. You need a plastic tank as it used the
    > > capacitance change between the water and an external aluminum strip on
    > > the outside.
    > > rondoc
    > >
    > > amps@yahoogroups.com, "Jonathan Peakall" <jpeakall@m...> wrote:
    > > > Hi all,
    > > >
    > > > A friend of mine wants to build a Stamp controller for his nifty
    > > home-made
    > > > water filtration system. The tank he has is 7 feet deep, and we
    > > would like
    > > > to be able to determine the water level within a foot or so. I am
    > > thinking
    > > > of a air type sensor with a tube from top to bottom of the tank. Any
    > > > recommendations? 0-5V output, or perhaps a resistive type.
    > > >
    > > > Thanks!
    > > >
    > > > Jonathan
    > > >
    > > > www.madlabs.info
    > >
    > >
    > > To UNSUBSCRIBE, just send mail to:
    > > basicstamps-unsubscribe@yahoogroups.com
    > > from the same email address that you subscribed. Text in the Subject
    and
    > Body of the message will be ignored.
    > >
    > >
    > > Your use of Yahoo! Groups is subject to
    http://docs.yahoo.com/info/terms/
    > >
    > >
    > >
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the Subject and
    Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
    >
    >
    >
    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2003-07-11 15:23
    I would rather avoid moving parts, especially as this is a water laden
    enviroment. I'm not sure how I could prtect the sonic sensor from
    condensation and moisture. I'll have to find out if water will reflect IR or
    not, it would be easy to make IR waterproof.

    Thanks,

    Jonathan

    www.madlabs.info
    Original Message
    From: "pm" <pmeloy@s...>
    To: <basicstamps@yahoogroups.com>
    Sent: Friday, July 11, 2003 12:09 AM
    Subject: Re: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank


    > Well, you know the depth and width of the tank - you could always try
    >
    > 1) A float and sprung reel. Hook it up to a multiturn pot somehow. Could
    be
    > a tab hokey but it might work.
    >
    > 2) Ultrasonic - Drill holes along the length of a PVC tube to let water in
    > and out. Put an ultrasonic range finder on top then put the tube into the
    > tank. Measure the distance to the top of the water and deduct the missing
    > volume. Infra-red might work, not sure if water would reflect or absorb it
    > though.
    >
    >
    Original Message
    > From: "Tim Stockman, STOCKMAN ELECTRONICS"
    > <tim.stockman@s...>
    > To: <basicstamps@yahoogroups.com>
    > Sent: Thursday, July 10, 2003 10:58 PM
    > Subject: Re: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank
    >
    >
    > > or a plastic pipe external to the tank with the strip(s) on that :-)
    > >
    > > Air pressure wont work due to the fact the air dissolves into the water
    > over
    > > time, plus condensation problems
    > > It can be done, but its not that simple unfortunately!
    > >
    > >
    Original Message
    > > From: "rondoc69" <rdoctors@c...>
    > > To: <basicstamps@yahoogroups.com>
    > > Sent: Friday, July 11, 2003 3:20 PM
    > > Subject: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank
    > >
    > >
    > > > HI IN a NUts and VOLts article on STAMPS there was a very neat
    > > > external depth sensing system. You need a plastic tank as it used the
    > > > capacitance change between the water and an external aluminum strip on
    > > > the outside.
    > > > rondoc
    > > >
    > > > amps@yahoogroups.com, "Jonathan Peakall" <jpeakall@m...> wrote:
    > > > > Hi all,
    > > > >
    > > > > A friend of mine wants to build a Stamp controller for his nifty
    > > > home-made
    > > > > water filtration system. The tank he has is 7 feet deep, and we
    > > > would like
    > > > > to be able to determine the water level within a foot or so. I am
    > > > thinking
    > > > > of a air type sensor with a tube from top to bottom of the tank. Any
    > > > > recommendations? 0-5V output, or perhaps a resistive type.
    > > > >
    > > > > Thanks!
    > > > >
    > > > > Jonathan
    > > > >
    > > > > www.madlabs.info
    > > >
    > > >
    > > > To UNSUBSCRIBE, just send mail to:
    > > > basicstamps-unsubscribe@yahoogroups.com
    > > > from the same email address that you subscribed. Text in the Subject
    > and
    > > Body of the message will be ignored.
    > > >
    > > >
    > > > Your use of Yahoo! Groups is subject to
    > http://docs.yahoo.com/info/terms/
    > > >
    > > >
    > > >
    > >
    > >
    > > To UNSUBSCRIBE, just send mail to:
    > > basicstamps-unsubscribe@yahoogroups.com
    > > from the same email address that you subscribed. Text in the Subject
    and
    > Body of the message will be ignored.
    > >
    > >
    > > Your use of Yahoo! Groups is subject to
    http://docs.yahoo.com/info/terms/
    > >
    > >
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the Subject and
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    >
    >
  • ArchiverArchiver Posts: 46,084
    edited 2003-07-11 15:25
    Sadler,

    Good idea! I could do IR this way too, which would be easier to protect from
    water.

    Thanks!

    Jonathan

    www.madlabs.info
    Original Message
    From: "Sadler Porter" <porter.sadler@s...>
    To: <basicstamps@yahoogroups.com>
    Sent: Friday, July 11, 2003 7:12 AM
    Subject: RE: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank


    > On item #2 if the tube is big enough why not float a ping pong ball and
    use
    > it to reflect the ultrasonic.
    >
    >
    Original Message
    > From: pm [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Kk6xL-CXroIShMnOhKI3umd4G050deqbgm8dBQNNY1_cUnBR7bzz7Vo2OE65eoG5jEUVhkB-WQk]pmeloy@s...[/url
    > Sent: Friday, July 11, 2003 3:09 AM
    > To: basicstamps@yahoogroups.com
    > Subject: Re: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank
    >
    > Well, you know the depth and width of the tank - you could always try
    >
    > 1) A float and sprung reel. Hook it up to a multiturn pot somehow. Could
    be
    > a tab hokey but it might work.
    >
    > 2) Ultrasonic - Drill holes along the length of a PVC tube to let water in
    > and out. Put an ultrasonic range finder on top then put the tube into the
    > tank. Measure the distance to the top of the water and deduct the missing
    > volume. Infra-red might work, not sure if water would reflect or absorb it
    > though.
    >
    >
    Original Message
    > From: "Tim Stockman, STOCKMAN ELECTRONICS"
    > <tim.stockman@s...>
    > To: <basicstamps@yahoogroups.com>
    > Sent: Thursday, July 10, 2003 10:58 PM
    > Subject: Re: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank
    >
    >
    > > or a plastic pipe external to the tank with the strip(s) on that :-)
    > >
    > > Air pressure wont work due to the fact the air dissolves into the water
    > over
    > > time, plus condensation problems
    > > It can be done, but its not that simple unfortunately!
    > >
    > >
    Original Message
    > > From: "rondoc69" <rdoctors@c...>
    > > To: <basicstamps@yahoogroups.com>
    > > Sent: Friday, July 11, 2003 3:20 PM
    > > Subject: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank
    > >
    > >
    > > > HI IN a NUts and VOLts article on STAMPS there was a very neat
    > > > external depth sensing system. You need a plastic tank as it used the
    > > > capacitance change between the water and an external aluminum strip on
    > > > the outside.
    > > > rondoc
    > > >
    > > > amps@yahoogroups.com, "Jonathan Peakall" <jpeakall@m...> wrote:
    > > > > Hi all,
    > > > >
    > > > > A friend of mine wants to build a Stamp controller for his nifty
    > > > home-made
    > > > > water filtration system. The tank he has is 7 feet deep, and we
    > > > would like
    > > > > to be able to determine the water level within a foot or so. I am
    > > > thinking
    > > > > of a air type sensor with a tube from top to bottom of the tank. Any
    > > > > recommendations? 0-5V output, or perhaps a resistive type.
    > > > >
    > > > > Thanks!
    > > > >
    > > > > Jonathan
    > > > >
    > > > > www.madlabs.info
    > > >
    > > >
    > > > To UNSUBSCRIBE, just send mail to:
    > > > basicstamps-unsubscribe@yahoogroups.com
    > > > from the same email address that you subscribed. Text in the Subject
    > and
    > > Body of the message will be ignored.
    > > >
    > > >
    > > > Your use of Yahoo! Groups is subject to
    > http://docs.yahoo.com/info/terms/
    > > >
    > > >
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  • ArchiverArchiver Posts: 46,084
    edited 2003-07-11 15:26
    If you're transmitting through it, water is a good IR absorber.


    Original Message
    From: "Jonathan Peakall" <jpeakall@m...>
    To: <basicstamps@yahoogroups.com>
    Sent: Friday, July 11, 2003 10:19 AM
    Subject: Re: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank


    > Tim,
    >
    > Drat! Good point. So do you think IR or sonic is the way to go? IR would
    be
    > easier to protect from the enviroment, but will water reflect IR or absorb
    > it?
    >
    > Thanks,
    >
    > Jonathan
    > www.madlabs.info
    >
    >
    Original Message
    > From: "Tim Stockman, STOCKMAN ELECTRONICS"
    > <tim.stockman@s...>
    > To: <basicstamps@yahoogroups.com>
    > Sent: Thursday, July 10, 2003 10:58 PM
    > Subject: Re: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank
    >
    >
    > > or a plastic pipe external to the tank with the strip(s) on that :-)
    > >
    > > Air pressure wont work due to the fact the air dissolves into the water
    > over
    > > time, plus condensation problems
    > > It can be done, but its not that simple unfortunately!
    > >
    > >
    Original Message
    > > From: "rondoc69" <rdoctors@c...>
    > > To: <basicstamps@yahoogroups.com>
    > > Sent: Friday, July 11, 2003 3:20 PM
    > > Subject: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank
    > >
    > >
    > > > HI IN a NUts and VOLts article on STAMPS there was a very neat
    > > > external depth sensing system. You need a plastic tank as it used the
    > > > capacitance change between the water and an external aluminum strip on
    > > > the outside.
    > > > rondoc
    > > >
    > > > amps@yahoogroups.com, "Jonathan Peakall" <jpeakall@m...> wrote:
    > > > > Hi all,
    > > > >
    > > > > A friend of mine wants to build a Stamp controller for his nifty
    > > > home-made
    > > > > water filtration system. The tank he has is 7 feet deep, and we
    > > > would like
    > > > > to be able to determine the water level within a foot or so. I am
    > > > thinking
    > > > > of a air type sensor with a tube from top to bottom of the tank. Any
    > > > > recommendations? 0-5V output, or perhaps a resistive type.
    > > > >
    > > > > Thanks!
    > > > >
    > > > > Jonathan
    > > > >
    > > > > www.madlabs.info
    > > >
    > > >
    > > > To UNSUBSCRIBE, just send mail to:
    > > > basicstamps-unsubscribe@yahoogroups.com
    > > > from the same email address that you subscribed. Text in the Subject
    > and
    > > Body of the message will be ignored.
    > > >
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    > http://docs.yahoo.com/info/terms/
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    > >
    > >
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  • ArchiverArchiver Posts: 46,084
    edited 2003-07-11 15:56
    a pcb board with a series of traces close together, parallel, not connected. the
    bottom of the board cut at an angle. the two end traces go to edge of pcb board
    where they can be put in a circuit as a resistance. the higher the water, the
    lower the resistance, etc.
    bill hart

    Jonathan Peakall <jpeakall@m...> wrote:
    Sadler,

    Good idea! I could do IR this way too, which would be easier to protect from
    water.

    Thanks!

    Jonathan

    www.madlabs.info
    Original Message
    From: "Sadler Porter"

    To:
    Sent: Friday, July 11, 2003 7:12 AM
    Subject: RE: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank


    > On item #2 if the tube is big enough why not float a ping pong ball and
    use
    > it to reflect the ultrasonic.
    >
    >
    Original Message
    > From: pm [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=1NTm0DbiVvefjgceXPRmFcrlQXl43b8XG2JMsa_XqGu3EROMSHBlHUQiSXcnKqMurV8wtJDx]pmeloy@s...[/url
    > Sent: Friday, July 11, 2003 3:09 AM
    > To: basicstamps@yahoogroups.com
    > Subject: Re: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank
    >
    > Well, you know the depth and width of the tank - you could always try
    >
    > 1) A float and sprung reel. Hook it up to a multiturn pot somehow. Could
    be
    > a tab hokey but it might work.
    >
    > 2) Ultrasonic - Drill holes along the length of a PVC tube to let water in
    > and out. Put an ultrasonic range finder on top then put the tube into the
    > tank. Measure the distance to the top of the water and deduct the missing
    > volume. Infra-red might work, not sure if water would reflect or absorb it
    > though.
    >
    >
    Original Message
    > From: "Tim Stockman, STOCKMAN ELECTRONICS"
    >
    > To:
    > Sent: Thursday, July 10, 2003 10:58 PM
    > Subject: Re: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank
    >
    >
    > > or a plastic pipe external to the tank with the strip(s) on that :-)
    > >
    > > Air pressure wont work due to the fact the air dissolves into the water
    > over
    > > time, plus condensation problems
    > > It can be done, but its not that simple unfortunately!
    > >
    > >
    Original Message
    > > From: "rondoc69"
    > > To:
    > > Sent: Friday, July 11, 2003 3:20 PM
    > > Subject: [noparse][[/noparse]basicstamps] Re: Pressure sensor for water tank
    > >
    > >
    > > > HI IN a NUts and VOLts article on STAMPS there was a very neat
    > > > external depth sensing system. You need a plastic tank as it used the
    > > > capacitance change between the water and an external aluminum strip on
    > > > the outside.
    > > > rondoc
    > > >
    > > > amps@yahoogroups.com, "Jonathan Peakall" wrote:
    > > > > Hi all,
    > > > >
    > > > > A friend of mine wants to build a Stamp controller for his nifty
    > > > home-made
    > > > > water filtration system. The tank he has is 7 feet deep, and we
    > > > would like
    > > > > to be able to determine the water level within a foot or so. I am
    > > > thinking
    > > > > of a air type sensor with a tube from top to bottom of the tank. Any
    > > > > recommendations? 0-5V output, or perhaps a resistive type.
    > > > >
    > > > > Thanks!
    > > > >
    > > > > Jonathan
    > > > >
    > > > > www.madlabs.info
    > > >
    > > >
    > > > To UNSUBSCRIBE, just send mail to:
    > > > basicstamps-unsubscribe@yahoogroups.com
    > > > from the same email address that you subscribed. Text in the Subject
    > and
    > > Body of the message will be ignored.
    > > >
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    [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2003-07-11 16:07
    Maybe we need something simple. A ball float with a micro switch attached.
    When the water level gets low the ball no longer floats and pulls the switch.
    That's how my high tech toilet knows when to stop filling....it's ran for years
    without any complex electronics monitoring it's levels...[noparse]:)[/noparse]

    Of course this only works if we are talking about an open tank. A pressurized
    tank is another story [noparse]:)[/noparse]

    >>> hellkat909@y... 07/11/03 09:56AM >>>
    a pcb board with a series of traces close together, parallel, not connected. the
    bottom of the board cut at an angle. the two end traces go to edge of pcb board
    where they can be put in a circuit as a resistance. the higher the water, the
    lower the resistance, etc.
    bill hart

    Jonathan Peakall <jpeakall@m...> wrote:
    Sadler,

    Good idea! I could do IR this way too, which would be easier to protect from
    water.

    Thanks!

    Jonathan

    www.madlabs.info
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