Rain Detector

Hey u all ,
thank you very much for supporting me. I hav gone inside the problem
and found something similar which you ppl suggested.
How about achieve this by considering the way of fual level detection
of auto mobiles ?
(simply it's a floter with a potentiometer).

And the bottem line It is recommended to implement the project with
C++. (should be work under kernal and user mode OS in the samw way)

Thanks a lot for your ideas.

 

How about trying two heavy gauge wires in glass or plastic tubing that
is sealed on one end. Make two probes a couple of inches (5 cm or so)
long and see how much capacitance you get with different spacings and
water depths.

The glass or plastic would make the metal choice irrelevant and will
prevent electrolysis.

If needed, you could go to a flat plate design by sealing the conductors
between insulating material. Remember to use fish safe glues.


Gerald Bonnstetter

 

I like the flat plate idea, lots of capacitance, might go that way!

Steve

 

I think the idea was that the copper was completely covered in
insulating materials and conductive effects were used.

Rocky

 

Related topic: Some irrigation systems have ground
moisture sensing so as to more precisely control when
watering is performed. Anyone have any idea how this
is done? I thought electrical conductivity would be
a reasonable method until someone mentioned that the
conductivity will change from fertilizing, etc.

 

Sorry I haven't responded for a while - I was off last week. I'm pretty sure
you can make it work to just about any reolution if you have an accurate
enough design. I don't think our probes have 1mm resolution but they are 4
feet long and don't need that kind of accuracy. I didn't design them though
and so I have no idea what type of oscillator or frequencies to start with.
Knowing our lot numbers like that would be bitterly guarded secrets anyway
:-(

In a good controlled environment like an aqaurium then you might be better
using load cells to weigh the tank. I was speaking to chap in the pub
yesterday who works with weighing machines who reckons he uses a load cell
with a few thou of movement which will measure up to 20 tonnes with a
200gram resolution! I was impressed.