On Tue, Aug 19, 2008 at 11:09 AM, Cédric Berger <[EMAIL PROTECTED]>wrote:
> > I would think main problem is microphone sensitivity/speaker strength. > Hard to get over noise. > But I am curious to know to what point this could work ! > Uncertainty in the measurement would be an issue, but to what degree I do not know. I think this could at least be accurate enough to adequately measure the length of a couch while shopping. The Vernier device [1] is pretty accurate: SPECIFICATIONS - ultrasound frequency: 50 kHz - resolution: 1 mm - accuracy: 2 mm - range: MD-BTD - 0.15 m to 6 m MDO-BTD - 0.5 m to 6 m - speed of ultrasound used to calculate distance: 343 m/s - power: 51 mA while running -Charles Edward Pax [1] http://www.vernier.com/til/1374.html
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