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Water leakage detection : time crunch

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technochrat

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Hello all,

I am not sure if this should be posted here,but..here goes.

I am trying to implement a water leakage sensor with the help of a microcontroller.

How can this be done?
My idea was to measure the resistace change in the conducting path when there is a water leakage.
In this case can the CTMU on the PIC microcontrollers be used?

Any suggestions for an alternative method will be apreciated..
 

Well here is the idea which I have in mind..

Two probes placed side by side with a known high resistance between them.

Supply a pulsed voltage to one of the probes and Monitor the current through the circuit through an analog input.

When water floods in to the middle of the 2 probes the resistance changes and hence the current,this change is measured

and a notification signal is generated.

Can this be done without the CTMU?
Does the CTMU idea have any advantage over a normal Analog input?
 

My solution would be to use source with overcurrent protection (some high-side smart switch) with output to one electrode. Then other electrode through a resistor to ground. Then measure voltage across resistor (or connect it to a comparator or some latch). I don't think CTMU is needed.
 

Thankyou for the reply..

I will drop the idea of CTMU.

But there is a requirement update...
This circuit is to be for detecting different fluids with different resistance levels.
So I will have to use an analog input signal with varying levels for different fluids..

Now I am a little bit confused about the implementation.How will the circuit look like if I have to use a voltage devider of somekind and measure varying voltages ...?
 

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