[Lab] Water sensor for an arduino?

[Jaime Yu]

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

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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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