Have a farmer for a customer with a large water
tank for watering his fields. He would like some
telemetry as to its state: full, half full, etc..
(Currently he uses the "There She Blows!" method
to see when the tank is full.)
Anyone have any suggestions? Be nice if it worked
How far away?
Why would he need the complication of TCP.
I am thinking 2 wires, a variable resistor at the tank and a gauge
that responds to it, similar to the gas gauge in a car.
That would not require any power at the tank at all.
On 10/29/2014 11:24 AM, email@example.com wrote:
He is within Wireless range
It supports Modbus with supports his Red Lion controller
He wants to show tank level next to his pump controls.
Eventually he wants to have the pump automatically turn
off through the Red Lion controller.
I would ask in Alt.Internet.Wireless as it's actually
pretty easy to put a webcam there, fed by solar, which
then transmits the water running into the inside of
your water tank, real time.
In fact, we have that set up for ourselves in some
of our neighbor's tanks. You can transmit for 20
miles if you have line of sight.
How about two weights hanging from a pully. The floating weight weighs
more than the weight that hangs loose in the air. That weight that
hangs in the air is spray painted fluorescent red.
The fuller the tank, the lower the red weight will be to the ground.
Telemetery is provided by an inexpensive pair of binoculars.
Similar I guess. I made a tide monitor with a drum, cable and a float,
connected to a 10 turn pot.
I would suggest that if he really wants a modbus solution I would
start with Red Lion. He can't be the first person to ask this
Depends on how much he wants to spend. If the tank is open at the top he
can use a pressure transducer very easy. Here is one that operates over the
Rosemont also makes single point switches. For that he will have to put a
hole in the tank at the levels he wants the switch to activate.
Drexelbrook makes some level measuring transmitters that operate on a 4 to
20 ma loop type circuit and other devices.
All depends on how much he wants to spend. He could put one of the point
level switches near the top and have it turn off the pump and anoter near
the bottom to turn the pump on.
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We could use rain, since we're in California, where they (reputedly)
fine you $500 for washing your car with a hose without a nozzle.
Poor grandkids though. I don't mind getting wet, but, they're
gonna get it on Friday.
For your telemetry, this is one option (albeit pricey):
Water tank sensing telemetry
Be sure to tell the grandkids what life was like before
running water, microwaves, flush toilets ... Make
sure you "embellish" a bit. It is no fun otherwise.
"Why, if we wanted a drink of water, we'd have to stand
out in the rain and open out mouths!" Probably won't buy
it, but fun anyway. But, will give them an excuse to
stand out in the rain.
gfretwell wrote, on Wed, 29 Oct 2014 21:19:54 -0400:
Thanks for the clarification. That gives us a range for the pressure mat
from 0 psi (empty) to around 5 psi (full).
I assume the output from the pressure mat would be an electrical signal
(resistance?) which the OP could then transmit to his computer.
I'd suggest, for example, the Ubiquiti Loco M900's or Nanosation2 M2's
(and others) to transmit the data.
Here are the datasheets:
And, I'd suggest a tiny Linux-driven TI microcomputer such as the
But, what pressure sensor mat would we suggest?
Actually, closer to 4.33 psig.
A cubic foot of water weighs 62.4 pounds, which is a good number to
That 62.4 pounds exerts a pressure on the bottom surface of the cubic
foot of :
62.4 pounds divided by 144 square inches, or 0.43333 pounds per square
So the pressure gradient of water is 0.43333 pounds per square inch per
foot of water column height, or 0.4333 psi/foot.
The pressure at the bottom of a 10 foot tall tank of water would be
4.333 psi gauge.
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