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From: "Matthias Grob" <matthias@grob.org> >...so I would rather need distance metering > in the 2-20cm range to measure knee, elbow and head positions, > maybe... > did you find such, too? Hey Matthias! You must be living right! Yesterday I wandered into our local Barnes and Noble bookstore to browse and found this book: "Programming and Customing the Basic Stamp Computer" by Scott Edwards (see http://www.amazon.com/exec/obidos/ASIN/0079136842/qid%3D973777809/105-857084 8-9842301 ) He's got a hardware/software project for short-range sonar. He states that it's most accurate in the 2-7" range. That'd be 5-18 cm when operated outside the US. Dennis Leas ------------------- dennis@mdbs.com