A little late to the party here, but (generally speaking) I would think that a non-contact type of solution would be the best. To that end, perhaps an ultrasonic solution would be workable. Maxbotix has a nice little line of ultrasonic sensors, and there was a nice write up in June 2008 Servo magazine outlining how to use each interface (serial, PWM, analog V) etc. <http://www.servomagazine.com/media-files/898/Building_a_Sonar_System.pdf > I don't know if the resolution is acceptable for your application, but these might be worth a look.
I was considering one of these for measuring the level in my fuel oil tank, once I identify a hydrocarbon opaque, acoustically transparent material to protect the sensor. Of course, this is on the *to do* list (which means it's unknown if it will ever happen :) Hope this helps. Paul ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
