What environment? Temperature, moving vs stationary, is the oil dispersed though the system during operation and returns to the tank when shutdown (car engine behavior)? There was a recent discussion of sensing water level, I think most of those answers are applicable here. Tripped on some sales literature for these a couple days ago - http://www.mtssensors.com/ Interesting ideas, but I have no clue about pricing. -Denny On Tue, Feb 17, 2015 at 10:39 AM, Neil wrote: > I looking into making an oil-level sensor as a general indicator of oil > level. It does not need to be super accurate, and really just needs to > indicate a minimum of 5 levels -- too low, low-side of normal, average > normal, high normal, or too full. Space for the sensor is tight -- > approx 1" dia and about 6" to 8" deep. I've found this page, which > shows some general ways this is done... > > http://www.machinerylubrication.com/Read/23921/oil-level-sensors-automoti= ve-industrial > > What I'm thinking is a small donut-shaped float around a 6" tube, with > magnets in the donut and reed or hall-effect sensors in the tube. Or > vice versa -- a tube with the sensors in the tube wall, and a magnetic > ball floating in the center. Any better (simpler) ideas? Or anyone > know if I can do this with some type of capacitive sensing? > > Cheers, > -Neil. > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .