Re: Newbie - water detector circuit help please



One day Malcx got dressed and committed to text

> Hi all,
>
>
> I've not dabled with any electronics since High school (about 10
> years) and have a fairly specific requirement for a detector that I
> want/need to put together....
>
> Background:
> My storage tank leaked and ruined the flooring - the plumber couldnt
> find anything obviously wrong with the tank but replaced the pieces
> that showed signs of wear and we've had no obvious leakage since...
>
> Now before the floor is re-laid I want to be doublly sure there no
> slow leak going on...
>
> As the storage tank gets warm, any surface (i.e. detectable) water
> will evaporate pretty quickly while other moisture will seep out of
> sight and do damage...
>
> Specification:
> I envisgae all being contained in a small box with probes coming out
> on lengthy wires.
>
> The box will have an LED that is permenantly on when the battery has
> power (I'd envisage a 9v cell...)
>
> There would need to be 2 or 3 moisture detection probes, when any 1
> probe registers moisture another led on the box will be lit. This led
> remains lit even after the probe dries. Only 1 led will be needed for
> all of the probes - i.e. there does not need to be an led for each
> probe.
>
> A reset button will be required to reset the state of the device back
> to "power led on only" mode.
>
> (Ideally the sensitivity of the probes would be adjustable)
>
> Can anyone help me with this seemingly simple circuit design? (I can
> fit it all together, pcb design etc once I've the circuit diagram)
>
> Thanks for your help in advance!
>
> Mal

Not an electronic solution but in our part of the world concealed storage
tanks are usually installed in a 'tray' fitted with a drain to waste which
would take care of the floor spoiling effect.

--
Regards ..... Rheilly Phoull


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