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Sensors / Detectors: Water / Moisture
Sensors Sensors / Detectors -- Main Page Last Updated on:
Saturday, June 27, 2009 04:43 PM
Circuits designed by Dave
Johnson, P.E. :
Electrodeless Water Level Monitor
This system operates much like a classic float switch but without any moving parts.
The illustration shows how a system using two copper coils sealed inside a plastic
pipe, can detect the level of water outside the pipe. Whenever the water level
is lower than the upper coil, no signal is coupled between the coils. Once
calibrated, this technique might also work on the outside of a plastic water tank.
(added 7/06)
WATER SEEPAGE ALARM
This simple circuit sounds a beeper when its electrodes detect water. A single 1.5v
N cell powers it. A small 1.5v button battery will also work.
Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
Plants Watering Watcher #3: Varying brightness LED signals the necessity to
water a plant. Very Low consumption,3V powered Circuit (added 9/04)
Pot Plant Power: All plants carry an electric charge relative to the ground.
This charge is more or less constant regardless of the size of the plant a kind of
background voltage" in nature. This electric charge suffuses the entire plant, from
its roots to its leaves and fruit. It was measured between a chrome-plated pin
inserted into the plant (the positive terminal) and an iron spike driven into the
ground (the negative terminal). (added 6/03)
Water Level Reference Design: The Water Level Reference design continuously
monitors water level and water flow using the temperature compensated MPXM2010GS
pressure sensor in the low cost MPAK package, a dual op–amp, and the MC68HC908QT4,
8–pin microcontroller. This system uses very few components, reducing the overall
system cost. This allows for a solution to compete with a mechanical switch for water
level detection but also offer additional applications such as monitoring water flow
for leak detection, and the other applications for smart washing machines. (app
note added 3/05)
