all respected:
I have worked on project of Water level sensor and Motor Control and successfully completed.
Now I want to further add features to it... Please tell me suitable features
very simple u need to use what they call a binary ladder circuit ------------
Use Potentiometric float.
What about to use a simple metal electrode to sense the water limits?
Whare can I buy it? ( Potentiometric float )
I think more hard part is installation.
Can I have plug and play sensor
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Life is more easy with sensor
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I am doing a similar project. I have 2 uC boards. One is at the tank and it used adc and potentiometic sensor to calculate the liquid level and then sends motor ON or OFF Command using nRF24L01 to motor control board which has another nRF24L01 and it picks up the command and controls the relay which controls the motor (pump).
What are the limitation that we have to face when we use Pressure sensor in your experiencePressure sensor can be used to detect water level but It has to be insulated fully so that water doesn't damage the device.
Capacitive plates can be made and place in tank making a capacitor and read capacitance as fluid acts as dielectric and so the capacitance changes with fluid level. Plates can be made wateproof using varnish. A lookup table translate it into available quantity in tank.
http://www.ieec.uned.es/Investigacion/Educon2010/SearchTool/EDUCON2010/papers/2010S03A01.pdf
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You can just make a simple sensor which is not too hard. But is technical. What u do is use a simple small ball like the one attached in our water closet system. Attach a soft iron to the ball so the iron can be carried up when the ball rises up due to the water level(when water level increases), and then brought down due to the water level too(when water level decreases.). The end of the soft iron is attached to a soft spring also. As the ball moves upward due to rise in water level then the spring is also drawn upward too and vice versa when the water level drops then the spring compresses back. The order end of the spring can be connected to a linear potentiometer. so that there would also be relative displacement as the spring moves upward or downward. Note that it is better to use a straight linear variable potentiometer rather than the circular type as that would be more complicated to sense...... The output from the straight linear potentiometer is then tapped for signal conditioning. Isn't dis easy??
Apart from a resistor u can also use a variable transformer or a linear variable differential transformer. If u are having difficulty in understanding this concept let me know
Hope this helps
Where are you from PA3040? In India magnetic float switches are available for just $3.
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