[Lab] Water sensor for an arduino?

Ken McKinnon klmckinnon at rogers.com
Wed Apr 2 17:28:09 EDT 2014

Ran across this search today while looking for alarm bits for a job.


There are a bunch ranging from $17 to several thousand, so that might be 
your first sort....some nice float ones fairly cheap.


On 2014-03-31 10:46 PM, Justin 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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