I looking into making an oil-level sensor as a general indicator of oil=20
level.  It does not need to be super accurate, and really just needs to=20
indicate a minimum of 5 levels -- too low, low-side of normal, average=20
normal, high normal, or too full.  Space for the sensor is tight --=20
approx 1" dia and about 6" to 8" deep.  I've found this page, which=20
shows some general ways this is done...=20
http://www.machinerylubrication.com/Read/23921/oil-level-sensors-automotive=
-industrial

What I'm thinking is a small donut-shaped float around a 6" tube, with=20
magnets in the donut and reed or hall-effect sensors in the tube.  Or=20
vice versa -- a tube with the sensors in the tube wall, and a magnetic=20
ball floating in the center.  Any better (simpler) ideas?  Or anyone=20
know if I can do this with some type of capacitive sensing?

Cheers,
-Neil.

--=20
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