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I haven't tired it yet but yes it is very much possible. It is just about getting the right power and type of transducer. For example if your tank is insulted (acoustically speaking) from the surroundings you can bash it with any object and it will ring with a certain frequency . The frequency will change depending on how full it is. So this should be equally possible with a controllable exciter but ultrasonic or not I'm not sure...
Hi i am also interested in whether or not it would work.to attach the sensor directly to the container wall. Have you tried this yet and is it possible?
Arduino dual ultrasonic liquid level meter with integrated website
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