[Lab] Water sensor for an arduino?

[Richard Wiens]

Lee Valley sells something that might do the trick.  Clearly you would just need the sensor part.

http://www.leevalley.com/en/garden/page.aspx?p=51137&cat=2,42194


Richard


________________________________
 From: Amos Hayes <amos at polkaroo.net>
To: Justin Slootsky <justin at slootsky.org> 
Cc: lab <lab at artengine.ca> 
Sent: Tuesday, April 1, 2014 9:01:10 AM
Subject: Re: [Lab] Water sensor for an arduino?
 


If you need something quick and functional, a shop that sells alarm system bits may have flood sensors. They have a little float that lifts and closes a circuit. Even Rona or Home Depot likely have them.
Otherwise, a piece of Styrofoam pegged at one end and a tilt switch might do it.
--
Amos
amos at polkaroo.net
On 31 Mar 2014 23:49, "Justin" <justin at slootsky.org> wrote:

 
>Awesome tips, thanks! 
>On March 31, 2014 10:26:25 PM
Jaime Yu <jaime.yu at gmail.com> wrote:
>Hey,
>>
>>
>>Sparkfun has some water level sensors
which you could check out. https://www.sparkfun.com/search/results?term=water+level.
It looks like their H20hNo! kit does exactly what you suggest so maybe you
can gleam some hints from their schematics. The distance between the
'nail sensors' will have to be awfully close in so the voltage
potential is enough so it can cross the medium. Water isn't that great
of a conductor and will probably require some experimentation to get the
distance right (ie: salty water is much more conductive than distilled). 
>>
>>
>>--
>>Sincerely,
>>Jaime Yu
>>B.Eng in Computer Engineering,
System Hardware
>>Software Developer III at Juniper Networks
>>
>>$CV =
"http://cv.jaimeyu.com"
>>$Blog = "http://ask.jaimeyu.com"
>>$Project = "http://www.capstone490.com"
>>$Linkedin =
"https://www.linkedin.com/in/jaimeyu"
>>$GitHub = "https://github.com/jaimeyu"
>>
>>
>>
>>On Mon, Mar 31, 2014 at 10:48 PM, Tom
Burns <tom.i.burns at gmail.com> wrote:
>>
>>If that doesn't work, use two nails and a floating conductive ball to
complete the circuit when the water raises.
>>>
>>>
>>>On Monday, March 31, 2014, Justin <justin at slootsky.org> wrote:
>>>
>>>With
spring comes flooding.
>>>>
>>>>I have a pump, but it doesn't have an auto shutoff, and it
shouldn't run dry.
>>>>
>>>>I have a powertail that I can use to turn the pump on and off, so now all I
need is a water sensor.
>>>>
>>>>Would this be as simple as two nails in a board with wires attached to the
nails? Water is conductive, when the water completes the circuit, the
Arduino notices and turns on the pump.
>>>>
>>>>Probably two water sensors, with the "on" sensor being above the
"off" sensor to prevent it from triggering on and off too fast.
>>>>
>>>>Is anything wrong with my logic? Why won't this work? Do I need more
than wires to make a water level sensor?
>>>>
>>>>
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>>
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