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low cost water flow meter any ideas?

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dani

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flow meter site:edaboard.com

Hi all,
I need to develop and simple water flow meter for my collage project which can be interfaced through microcontroller so that i can display the flow rate on lcd screen any one have idea about such a sensor then plz tell.

regards
:?:
 

1. Use 2 thermistors. One is maintained at a constant temperature (constt R) and the other measures the water temperature. The power needed to maintain the TH1 at a constant temperature depends on flow and water T. Use lookup tables to compute flow.

2. Use paddle float with a spring that deflects the paddle in proportion to the flow. Measure the deflection.

3. Use a rudder fan and measure the speed of the fan. You will have to figure out a way to seal it from water.
 

If the flow rate isn't too large for example in saline drips in hospitals you can use a capacitor with the plates on either side of the water flow. The capacitance changes with the dielectric constant which varies with the amount of water flowing through.
 

use what is used on some boat sensors.
By placing a magnetic field at right angle to flow and then measure electrical current
measure time of flight with two ultrasonic xducers.
 

Use an orifice plate; and measure the pressure on both sides
 

Turn a light weight wheel. then count the number of rotations using an optical mehtod ...within a certain time (say 0.5 s). Try smaller period for larger speed and better resolution.

Best Regards

Randika K
 

This is exactly what a turbine flowmeter does.
 

there is an article :
**broken link removed**

also contains some useful references.
 

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