After you figure out the system you want to use
I personally always like to incorporate a watchdog timer
If the pump runs for more than I would normally expect it to run, I shut
it down
Requiring a manual reset
I've seen to many pumps run dry for days due to faulty automatic
controls.

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of John Waters
Sent: Wednesday, June 09, 2004 4:35 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: [EE]: water level detection, how?


Hi All,

I have a tank with a submersible pump inside, I want to stop the pump
from
running dry when the water level is too low, what sort of sensor could I
use? I'm thinking of using a float with a magnet attached, the magnetic
field will trigger a relay to turn off the power, does anyone get
experience
in building this kind of thing and would like to share the experience
with
me?

Thanks in advance!

John

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