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pls help me to build water level meter.the one i made uses 5 probes for empty,quarter,half and full.Now a want a better design.can i use uvison and simulate something. what
Per Westermark's suggest is correct. i think the capacitive sensor is easy to do. when water deep, the capacitive value will large. use this capacitive to build a RC oscillator, then measure this oscillator output's frequency, you can know how deep the water is. you need make a Good insulation PROBE pair.
The capacitive sensor is not easy.
If you want any sort of accuracy across temperature, you need a reference sensor (compensator) to determine the specific gravity of the fluid.
The hardware is going to be very sensitive to interference and stray capacitance because the probe will likely have a very small capacitance, in the pF range.
I'm not sure about the stability of an RC oscillator, I think capacitive fluid level sensors typically use a capacitance bridge to determine the value of the unknown cap. This type of system is typically used in larger aircraft fuel quantity measurement.
ND
I did something similar with a differential pressure sensor and a pipe connected on the sensor on one side with the other side in the water. You litterally measure the column of water. It worked very well.
Hi U ALL!
I'm looking for FASTEST encrypt/decrypt AES-128 C algorithem for family.....Plez no delphi or FML or other
Can anyone help me?
thank you all!!!!!!!!!!
manuel englais (Deeesef Pro)
1) Why do you think a 8051 thread would supply source for Delphi? Would 8051 sound like a good processor for trying to run Delphi?
2) Exactly how do you think AES relates to measuring the level in a water tank? Using the ripples on the water surface for the random number generator when doing the initial key exchange or possibly for the generation of the keys???
Can we have more insight into the dimensions of the water vessel to be measured?
Do you want to go with a simple expansion to 8 probes, or would a float and potentiometer be appropriate?
Perhaps ultrasonic rangefinder to detect depth to water?
Probe that changes capacitence as the water level increases?
At the extreme, a lovely woman with a tape measure. Pleasant to look at and voice output.
Many ways to approach this, but we need to know more details of the application first.
Unfortunately, that seems unlikely - the OP seems to have lost interest.
:-(
"Unfortunately, that seems unlikely - the OP seems to have lost interest."
Google does not show any cross-posts, but most forums don't get scanned by Google. Not impossible that the OP did get a better answer - or a full solution - from some other site.
Which would tend to make him lose interest in his other thread(s)...
hey...who has any idea on how can i build a water level sensor using a one probe only....meaning the output or reading will be linearly..has anyone.???
I guess you did not read this thread.
There are a number of suggested designs in this thread for measuring the water level with a single sensor.
www.arrowne.com/.../f_1550.shtml
"The devices rely for their operation on the sensitivity of the PTC element's tip to variations in ambient thermal conditions. The transition from liquid to air and vice versa causes the rate of thermal loss to change very quickly as does the resistance of the PTC element. This allows the device to record very simply and exactly whenever a liquid goes above or below a certain level."