The problem with any electrical system in a metal tank is electrolysis. If
a fitting is weakened do to electrolysis and fails the insurance companies
will not pick up the bill. Remember 500 gallons is a large chunk of water.
Think very carefully about implementing active measuring devices.
Also remember that stored water from a city or well source is full of
interesting chemicals and minerals. Any metal probe will be affected after
a period of time by the treatment chemicals or mineral build up.
Go with an ultrasonic, light or a sight tube with a shut offf valve.
Look up the stamp app note on the Nuts and Volts magazine website.
ITs cheap and easy.
Original Message
From: "Mindz Development House" <mindz@a...>
To: <basicstamps@egroups.com>
Cc: <ebowam@h...>
Sent: Friday, October 13, 2000 3:33 PM
Subject: [noparse][[/noparse]basicstamps] Water tank meter
> I have two 500 gallon water tanks as the main water supply source
for a
> house. I'm trying to build a level meter using a Stamp. My major
hurdle is
> how to determine the water level in the tank electronically (without
> mechanical floats). Does anyone out there have any practical ideas?
> Thanks
>
> Ebow
>
>
>
>
>
I have two 500 gallon water tanks as the main water supply source for a
house. I'm trying to build a level meter using a Stamp. My major hurdle is
how to determine the water level in the tank electronically (without
mechanical floats). Does anyone out there have any practical ideas?
Thanks
At 04:33 PM 10/13/00 +0100, you wrote:
>I have two 500 gallon water tanks as the main water supply source for a
>house. I'm trying to build a level meter using a Stamp. My major hurdle is
>how to determine the water level in the tank electronically (without
>mechanical floats). Does anyone out there have any practical ideas?
>Thanks
>
>Ebow
_________________________________
Mike Walsh walsh@i...
California Institute of Technology
Biology Electronics Shop
MS 216-76
Pasadena, CA 91125
Water pressure. One atsmosphere is somewhere around 14.7 psi and
that is very roughly equalavent to 34 feet of water. I rember this
from my old SCBUA classes 20 years ago. So is you put a 15 PSI
transducer below your tank, you can calibrate for level.
If I remember correctly it is not linear, but like I said, 20
years.....
Dave
--- In basicstamps@egroups.com, "Mindz Development House"
<mindz@a...> wrote:
> I have two 500 gallon water tanks as the main water supply source
for a
> house. I'm trying to build a level meter using a Stamp. My major
hurdle is
> how to determine the water level in the tank electronically (without
> mechanical floats). Does anyone out there have any practical ideas?
> Thanks
>
> Ebow
I forgot to mention that direct pressure will yield
tank pressure. If the pressure sensor is in the tank,
so it's surrounded by tank pressure, then it will report
water level pressure.
1 PSI = 27.72 inches of water. The transducer would need to be
in an atmosphere with equivalent pressure to the air in the
top of the tank so that tank pressure is not measured.
Kind of like a water level sight on a steam iron.
Pressure sensors of low pressure can get expensive so
there are be cheaper ways.
You could use a sonic distance sensor to measure
how close the level is to the top of the tank.
Another alternative is to use a glass tube that is connected
to the top and bottom of the tank so water in the tube will
be equal to tank water level. Then put in a float that will
block the light or beam, then use some type of IR or
sonic or LED or even hall effect to indicate when the
water pushes your float above a certain level.
--- In basicstamps@egroups.com, davemucha@j... wrote:
> Water pressure. One atsmosphere is somewhere around 14.7 psi and
> that is very roughly equalavent to 34 feet of water. I rember this
> from my old SCBUA classes 20 years ago. So is you put a 15 PSI
> transducer below your tank, you can calibrate for level.
>
> If I remember correctly it is not linear, but like I said, 20
> years.....
>
> Dave
>
>
> --- In basicstamps@egroups.com, "Mindz Development House"
> <mindz@a...> wrote:
> > I have two 500 gallon water tanks as the main water supply source
> for a
> > house. I'm trying to build a level meter using a Stamp. My
major
> hurdle is
> > how to determine the water level in the tank electronically
(without
> > mechanical floats). Does anyone out there have any practical
ideas?
> > Thanks
> >
> > Ebow
If you are looking for a pressure sensor check Motorola www.mot.com they
have true, differential and other types of pressure sensors. Most have a
0-5v output which you could read using an ADC. You can call or email them
and many times get engineering samples for free.
Brian
Original Message
From: "Mindz Development House" <mindz@a...>
To: <basicstamps@egroups.com>
Cc: <ebowam@h...>
Sent: Friday, October 13, 2000 10:33 AM
Subject: [noparse][[/noparse]basicstamps] Water tank meter
> I have two 500 gallon water tanks as the main water supply source for a
> house. I'm trying to build a level meter using a Stamp. My major hurdle
is
> how to determine the water level in the tank electronically (without
> mechanical floats). Does anyone out there have any practical ideas?
> Thanks
>
> Ebow
>
>
>
>
>
>
The article Ron Anderson refers to has about 10-12 ways to measure water
levels in containers, some with mechanical means, others with resistance,
conductivity, and some other means. I dont have the link to the article
either, but I think I saved the pdf. somewhere..I will look for
it and sent it if I find it. I seem to recall stumbling over
it pretty easy though.
>If you are looking for a pressure sensor check Motorola www.mot.com they
>have true, differential and other types of pressure sensors. Most have a
>0-5v output which you could read using an ADC. You can call or email them
>and many times get engineering samples for free.
>
>
>
>Brian
>
>
>
Original Message
>From: "Mindz Development House" <mindz@a...>
>To: <basicstamps@egroups.com>
>Cc: <ebowam@h...>
>Sent: Friday, October 13, 2000 10:33 AM
>Subject: [noparse][[/noparse]basicstamps] Water tank meter
>
>
>> I have two 500 gallon water tanks as the main water supply source for a
>> house. I'm trying to build a level meter using a Stamp. My major hurdle
>is
>> how to determine the water level in the tank electronically (without
>> mechanical floats). Does anyone out there have any practical ideas?
>> Thanks
>>
>> Ebow
>>
>>
>>
>>
>>
>>
>
>
>
>
>
At 04:33 PM 10/13/00 +0100, Mindz Development House wrote:
>I have two 500 gallon water tanks as the main water supply source for a
>house. I'm trying to build a level meter using a Stamp. My major hurdle is
>how to determine the water level in the tank electronically (without
>mechanical floats). Does anyone out there have any practical ideas?
>Thanks
Several fairly easy ways to do it.
Easiest is if you can drill holes into the side of the tank and install
probes at various levels. I use a type of wall anchor - I don't have
manufacturer or part number handy but found them at a hardware store. The
ones that I used are made of black rubber and have a brass insert at the
small end. Tightening the screw compresses the rubber for a water tight
seal - sort of like the old style thermos tops. I replaced the steel screw
that the anchors came with originally with stainless steel.
A similar technique is to install a stiff tube vertically within the tank,
with probes stuck out the side of the tube at various levels. The wiring
to the probes is contained within the tube.
Any probe based system relies upon the conductivity of the liquid. It
won't work with distilled water or any other non-conductive liquid. You
also have to use AC excitation to avoid electrolytic or corrosion
problems. But it is extremely easy to implement.
You could also use an air bubble system. I've done this, as well, but its
a LOT harder to get
accurate, especially over wide temperature ranges.
I'm sure others will come up with ideas as well. Let me know if you want
details on implementing a probe based system.
> I have two 500 gallon water tanks as the main water supply source for a
> house. I'm trying to build a level meter using a Stamp. My major hurdle
is
> how to determine the water level in the tank electronically (without
> mechanical floats). Does anyone out there have any practical ideas?
> Thanks
How about a pressure (weight) sensor under the tank ?
Using a Polaroid sonar sensor has been discussed on this list in the past
and can be referrenced if you're interested.
This would allow you to mount the sensor to the top of the tank, out of any
contact with water, and the value computed will bear an inverse relationship
to the amount of water in the tank (the larger the distance from the sensor
to the surface of the water means less water in the tank).
Good luck!
Roger
Original Message
From: "Mindz Development House" <mindz@a...>
To: <basicstamps@egroups.com>
Cc: <ebowam@h...>
Sent: Friday, October 13, 2000 8:33 AM
Subject: [noparse][[/noparse]basicstamps] Water tank meter
> I have two 500 gallon water tanks as the main water supply source for a
> house. I'm trying to build a level meter using a Stamp. My major hurdle
is
> how to determine the water level in the tank electronically (without
> mechanical floats). Does anyone out there have any practical ideas?
> Thanks
>
> Ebow
>
>
>
>
I've seen an original sensor for that application. It's a capacitor, made of
two pieces of isolated wire, fixed side-by-side at a litttle distance. Those
two wires are fixed verticaly on the wall, in the tank.. As the water level
varies, the value of the capacitor varies also. This capacitor is used in an
oscillator, so the frequency changes with the water level. This system may
be used for other liquids like fuel.
If you're interrested, I can send you the schematic.
Phil.
Computer Solutions - Belgium derennep@s...
Original Message
From: Mindz Development House <mindz@a...>
To: <basicstamps@egroups.com>
Cc: <ebowam@h...>
Sent: Friday, October 13, 2000 5:33 PM
Subject: [noparse][[/noparse]basicstamps] Water tank meter
> I have two 500 gallon water tanks as the main water supply source for a
> house. I'm trying to build a level meter using a Stamp. My major hurdle
is
> how to determine the water level in the tank electronically (without
> mechanical floats). Does anyone out there have any practical ideas?
> Thanks
>
> Ebow
>
>
>
>
>
This sounds interesting, I would be interested in the schmatic etc.
Thanks
Steve
At 06:11 PM 10/14/2000 +0200, you wrote:
>Hi Ebow,
>
>I've seen an original sensor for that application. It's a capacitor, made of
>two pieces of isolated wire, fixed side-by-side at a litttle distance. Those
>two wires are fixed verticaly on the wall, in the tank.. As the water level
>varies, the value of the capacitor varies also. This capacitor is used in an
>oscillator, so the frequency changes with the water level. This system may
>be used for other liquids like fuel.
>If you're interrested, I can send you the schematic.
>
>Phil.
>Computer Solutions - Belgium
>derennep@s...
>
>
Original Message
>From: Mindz Development House <mindz@a...>
>To: <basicstamps@egroups.com>
>Cc: <ebowam@h...>
>Sent: Friday, October 13, 2000 5:33 PM
>Subject: [noparse][[/noparse]basicstamps] Water tank meter
>
>
>> I have two 500 gallon water tanks as the main water supply source for a
>> house. I'm trying to build a level meter using a Stamp. My major hurdle
>is
>> how to determine the water level in the tank electronically (without
>> mechanical floats). Does anyone out there have any practical ideas?
>> Thanks
>>
>> Ebow
>>
>>
>>
>>
>>
>
>
>
>
Philippe, the most accurate way to measure level in a water or any
tank/vessel is to install load cells under or hang tank by three equally
spaced load cells.
because they are not ever in contact w/ water or material in tank, and have
a life cycle range greater than 100 million, they would be a excellent
choice.
load cells in this range would cost $200 ea. w/ 0-5 vdc out . let me know
if you need some. Alan
Original Message
From: Philippe Derenne <derennep@s...>
To: <basicstamps@egroups.com>
Sent: Saturday, October 14, 2000 9:11 AM
Subject: Re: [noparse][[/noparse]basicstamps] Water tank meter
> Hi Ebow,
>
> I've seen an original sensor for that application. It's a capacitor, made
of
> two pieces of isolated wire, fixed side-by-side at a litttle distance.
Those
> two wires are fixed verticaly on the wall, in the tank.. As the water
level
> varies, the value of the capacitor varies also. This capacitor is used in
an
> oscillator, so the frequency changes with the water level. This system may
> be used for other liquids like fuel.
> If you're interrested, I can send you the schematic.
>
> Phil.
> Computer Solutions - Belgium
> derennep@s...
>
>
Original Message
> From: Mindz Development House <mindz@a...>
> To: <basicstamps@egroups.com>
> Cc: <ebowam@h...>
> Sent: Friday, October 13, 2000 5:33 PM
> Subject: [noparse][[/noparse]basicstamps] Water tank meter
>
>
> > I have two 500 gallon water tanks as the main water supply source for a
> > house. I'm trying to build a level meter using a Stamp. My major
hurdle
> is
> > how to determine the water level in the tank electronically (without
> > mechanical floats). Does anyone out there have any practical ideas?
> > Thanks
> >
> > Ebow
> >
> >
> >
> >
> >
>
>
>
>
Archiver
Posts: 46,084
Comments
a fitting is weakened do to electrolysis and fails the insurance companies
will not pick up the bill. Remember 500 gallons is a large chunk of water.
Think very carefully about implementing active measuring devices.
Also remember that stored water from a city or well source is full of
interesting chemicals and minerals. Any metal probe will be affected after
a period of time by the treatment chemicals or mineral build up.
Go with an ultrasonic, light or a sight tube with a shut offf valve.
tank measurement.
Look up the stamp app note on the Nuts and Volts magazine website.
ITs cheap and easy.
Original Message
From: "Mindz Development House" <mindz@a...>
To: <basicstamps@egroups.com>
Cc: <ebowam@h...>
Sent: Friday, October 13, 2000 3:33 PM
Subject: [noparse][[/noparse]basicstamps] Water tank meter
> I have two 500 gallon water tanks as the main water supply source
for a
> house. I'm trying to build a level meter using a Stamp. My major
hurdle is
> how to determine the water level in the tank electronically (without
> mechanical floats). Does anyone out there have any practical ideas?
> Thanks
>
> Ebow
>
>
>
>
>
house. I'm trying to build a level meter using a Stamp. My major hurdle is
how to determine the water level in the tank electronically (without
mechanical floats). Does anyone out there have any practical ideas?
Thanks
Ebow
Not a cheap solution, but you might want to check out Senix.
http://www.senix.com/apps_level-height.htm#liquids
Mike
At 04:33 PM 10/13/00 +0100, you wrote:
>I have two 500 gallon water tanks as the main water supply source for a
>house. I'm trying to build a level meter using a Stamp. My major hurdle is
>how to determine the water level in the tank electronically (without
>mechanical floats). Does anyone out there have any practical ideas?
>Thanks
>
>Ebow
_________________________________
Mike Walsh
walsh@i...
California Institute of Technology
Biology Electronics Shop
MS 216-76
Pasadena, CA 91125
626-395-6825 , FAX 626-584-1654
237 Beckman Behavioral Biology Bldg.
that is very roughly equalavent to 34 feet of water. I rember this
from my old SCBUA classes 20 years ago. So is you put a 15 PSI
transducer below your tank, you can calibrate for level.
If I remember correctly it is not linear, but like I said, 20
years.....
Dave
--- In basicstamps@egroups.com, "Mindz Development House"
<mindz@a...> wrote:
> I have two 500 gallon water tanks as the main water supply source
for a
> house. I'm trying to build a level meter using a Stamp. My major
hurdle is
> how to determine the water level in the tank electronically (without
> mechanical floats). Does anyone out there have any practical ideas?
> Thanks
>
> Ebow
I forgot to mention that direct pressure will yield
tank pressure. If the pressure sensor is in the tank,
so it's surrounded by tank pressure, then it will report
water level pressure.
1 PSI = 27.72 inches of water. The transducer would need to be
in an atmosphere with equivalent pressure to the air in the
top of the tank so that tank pressure is not measured.
Kind of like a water level sight on a steam iron.
Pressure sensors of low pressure can get expensive so
there are be cheaper ways.
You could use a sonic distance sensor to measure
how close the level is to the top of the tank.
Another alternative is to use a glass tube that is connected
to the top and bottom of the tank so water in the tube will
be equal to tank water level. Then put in a float that will
block the light or beam, then use some type of IR or
sonic or LED or even hall effect to indicate when the
water pushes your float above a certain level.
--- In basicstamps@egroups.com, davemucha@j... wrote:
> Water pressure. One atsmosphere is somewhere around 14.7 psi and
> that is very roughly equalavent to 34 feet of water. I rember this
> from my old SCBUA classes 20 years ago. So is you put a 15 PSI
> transducer below your tank, you can calibrate for level.
>
> If I remember correctly it is not linear, but like I said, 20
> years.....
>
> Dave
>
>
> --- In basicstamps@egroups.com, "Mindz Development House"
> <mindz@a...> wrote:
> > I have two 500 gallon water tanks as the main water supply source
> for a
> > house. I'm trying to build a level meter using a Stamp. My
major
> hurdle is
> > how to determine the water level in the tank electronically
(without
> > mechanical floats). Does anyone out there have any practical
ideas?
> > Thanks
> >
> > Ebow
have true, differential and other types of pressure sensors. Most have a
0-5v output which you could read using an ADC. You can call or email them
and many times get engineering samples for free.
Brian
Original Message
From: "Mindz Development House" <mindz@a...>
To: <basicstamps@egroups.com>
Cc: <ebowam@h...>
Sent: Friday, October 13, 2000 10:33 AM
Subject: [noparse][[/noparse]basicstamps] Water tank meter
> I have two 500 gallon water tanks as the main water supply source for a
> house. I'm trying to build a level meter using a Stamp. My major hurdle
is
> how to determine the water level in the tank electronically (without
> mechanical floats). Does anyone out there have any practical ideas?
> Thanks
>
> Ebow
>
>
>
>
>
>
levels in containers, some with mechanical means, others with resistance,
conductivity, and some other means. I dont have the link to the article
either, but I think I saved the pdf. somewhere..I will look for
it and sent it if I find it. I seem to recall stumbling over
it pretty easy though.
Dave
Original Message
From: Brian McClure <bmcclure@p...>
To: basicstamps@egroups.com <basicstamps@egroups.com>
Cc: ebowam@h... <ebowam@h...>
Date: Friday, October 13, 2000 6:14 PM
Subject: Re: [noparse][[/noparse]basicstamps] Water tank meter
>If you are looking for a pressure sensor check Motorola www.mot.com they
>have true, differential and other types of pressure sensors. Most have a
>0-5v output which you could read using an ADC. You can call or email them
>and many times get engineering samples for free.
>
>
>
>Brian
>
>
>
Original Message
>From: "Mindz Development House" <mindz@a...>
>To: <basicstamps@egroups.com>
>Cc: <ebowam@h...>
>Sent: Friday, October 13, 2000 10:33 AM
>Subject: [noparse][[/noparse]basicstamps] Water tank meter
>
>
>> I have two 500 gallon water tanks as the main water supply source for a
>> house. I'm trying to build a level meter using a Stamp. My major hurdle
>is
>> how to determine the water level in the tank electronically (without
>> mechanical floats). Does anyone out there have any practical ideas?
>> Thanks
>>
>> Ebow
>>
>>
>>
>>
>>
>>
>
>
>
>
>
>I have two 500 gallon water tanks as the main water supply source for a
>house. I'm trying to build a level meter using a Stamp. My major hurdle is
>how to determine the water level in the tank electronically (without
>mechanical floats). Does anyone out there have any practical ideas?
>Thanks
Several fairly easy ways to do it.
Easiest is if you can drill holes into the side of the tank and install
probes at various levels. I use a type of wall anchor - I don't have
manufacturer or part number handy but found them at a hardware store. The
ones that I used are made of black rubber and have a brass insert at the
small end. Tightening the screw compresses the rubber for a water tight
seal - sort of like the old style thermos tops. I replaced the steel screw
that the anchors came with originally with stainless steel.
A similar technique is to install a stiff tube vertically within the tank,
with probes stuck out the side of the tube at various levels. The wiring
to the probes is contained within the tube.
Any probe based system relies upon the conductivity of the liquid. It
won't work with distilled water or any other non-conductive liquid. You
also have to use AC excitation to avoid electrolytic or corrosion
problems. But it is extremely easy to implement.
You could also use an air bubble system. I've done this, as well, but its
a LOT harder to get
accurate, especially over wide temperature ranges.
I'm sure others will come up with ideas as well. Let me know if you want
details on implementing a probe based system.
dwayne
Dwayne Reid <dwayner@p...>
Trinity Electronics Systems Ltd Edmonton, AB, CANADA
(780) 489-3199 voice (780) 487-6397 fax
Celebrating 16 years of Engineering Innovation (1984 - 2000)
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Do NOT send unsolicited commercial email to this email address.
This message neither grants consent to receive unsolicited
commercial email nor is intended to solicit commercial email.
> house. I'm trying to build a level meter using a Stamp. My major hurdle
is
> how to determine the water level in the tank electronically (without
> mechanical floats). Does anyone out there have any practical ideas?
> Thanks
How about a pressure (weight) sensor under the tank ?
and can be referrenced if you're interested.
This would allow you to mount the sensor to the top of the tank, out of any
contact with water, and the value computed will bear an inverse relationship
to the amount of water in the tank (the larger the distance from the sensor
to the surface of the water means less water in the tank).
Good luck!
Roger
Original Message
From: "Mindz Development House" <mindz@a...>
To: <basicstamps@egroups.com>
Cc: <ebowam@h...>
Sent: Friday, October 13, 2000 8:33 AM
Subject: [noparse][[/noparse]basicstamps] Water tank meter
> I have two 500 gallon water tanks as the main water supply source for a
> house. I'm trying to build a level meter using a Stamp. My major hurdle
is
> how to determine the water level in the tank electronically (without
> mechanical floats). Does anyone out there have any practical ideas?
> Thanks
>
> Ebow
>
>
>
>
I've seen an original sensor for that application. It's a capacitor, made of
two pieces of isolated wire, fixed side-by-side at a litttle distance. Those
two wires are fixed verticaly on the wall, in the tank.. As the water level
varies, the value of the capacitor varies also. This capacitor is used in an
oscillator, so the frequency changes with the water level. This system may
be used for other liquids like fuel.
If you're interrested, I can send you the schematic.
Phil.
Computer Solutions - Belgium
derennep@s...
Original Message
From: Mindz Development House <mindz@a...>
To: <basicstamps@egroups.com>
Cc: <ebowam@h...>
Sent: Friday, October 13, 2000 5:33 PM
Subject: [noparse][[/noparse]basicstamps] Water tank meter
> I have two 500 gallon water tanks as the main water supply source for a
> house. I'm trying to build a level meter using a Stamp. My major hurdle
is
> how to determine the water level in the tank electronically (without
> mechanical floats). Does anyone out there have any practical ideas?
> Thanks
>
> Ebow
>
>
>
>
>
This sounds interesting, I would be interested in the schmatic etc.
Thanks
Steve
At 06:11 PM 10/14/2000 +0200, you wrote:
>Hi Ebow,
>
>I've seen an original sensor for that application. It's a capacitor, made of
>two pieces of isolated wire, fixed side-by-side at a litttle distance. Those
>two wires are fixed verticaly on the wall, in the tank.. As the water level
>varies, the value of the capacitor varies also. This capacitor is used in an
>oscillator, so the frequency changes with the water level. This system may
>be used for other liquids like fuel.
>If you're interrested, I can send you the schematic.
>
>Phil.
>Computer Solutions - Belgium
>derennep@s...
>
>
Original Message
>From: Mindz Development House <mindz@a...>
>To: <basicstamps@egroups.com>
>Cc: <ebowam@h...>
>Sent: Friday, October 13, 2000 5:33 PM
>Subject: [noparse][[/noparse]basicstamps] Water tank meter
>
>
>> I have two 500 gallon water tanks as the main water supply source for a
>> house. I'm trying to build a level meter using a Stamp. My major hurdle
>is
>> how to determine the water level in the tank electronically (without
>> mechanical floats). Does anyone out there have any practical ideas?
>> Thanks
>>
>> Ebow
>>
>>
>>
>>
>>
>
>
>
>
tank/vessel is to install load cells under or hang tank by three equally
spaced load cells.
because they are not ever in contact w/ water or material in tank, and have
a life cycle range greater than 100 million, they would be a excellent
choice.
load cells in this range would cost $200 ea. w/ 0-5 vdc out . let me know
if you need some. Alan
Original Message
From: Philippe Derenne <derennep@s...>
To: <basicstamps@egroups.com>
Sent: Saturday, October 14, 2000 9:11 AM
Subject: Re: [noparse][[/noparse]basicstamps] Water tank meter
> Hi Ebow,
>
> I've seen an original sensor for that application. It's a capacitor, made
of
> two pieces of isolated wire, fixed side-by-side at a litttle distance.
Those
> two wires are fixed verticaly on the wall, in the tank.. As the water
level
> varies, the value of the capacitor varies also. This capacitor is used in
an
> oscillator, so the frequency changes with the water level. This system may
> be used for other liquids like fuel.
> If you're interrested, I can send you the schematic.
>
> Phil.
> Computer Solutions - Belgium
> derennep@s...
>
>
Original Message
> From: Mindz Development House <mindz@a...>
> To: <basicstamps@egroups.com>
> Cc: <ebowam@h...>
> Sent: Friday, October 13, 2000 5:33 PM
> Subject: [noparse][[/noparse]basicstamps] Water tank meter
>
>
> > I have two 500 gallon water tanks as the main water supply source for a
> > house. I'm trying to build a level meter using a Stamp. My major
hurdle
> is
> > how to determine the water level in the tank electronically (without
> > mechanical floats). Does anyone out there have any practical ideas?
> > Thanks
> >
> > Ebow
> >
> >
> >
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