Subject:
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Re: 15' max measurement
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 14 May 1996 21:15:09 GMT
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Original-From:
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MAR ERICSON <mar@cooper.edu!AvoidSpam!>
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Viewed:
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1252 times
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>
> Yup, it looks like 15' is about as far as I can measure. In fact,
> if the distance is _too_ great, I start getting weird measurements, on the
> order of 8 or 9 feet. Strange. I turned the gain up a bit, which keeps
> those erratic measurements from happening as often, but 15' still seems to
> be the maximum measurement I can make. By the way, this is with a .1uF cap
> across C7 on the board, and a 1K resistor inline with BINH. Is this the
> typical maximum for everyone else? Or is something weird going on with my
> module? (Wrong resistor size, lead lengths too long, etc...) I mean, 15'
> is great, but why not make it closer to the max specs instead? :-)
I believe it would matter what type of material you reflect the pulse off of, I would guess. Different surfaces have differenc acoustical properties. Just like they have those silent rooms and echo chambers, etc.
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Message is in Reply To:
 | | 15' max measurement
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| Yup, it looks like 15' is about as far as I can measure. In fact, if the distance is _too_ great, I start getting weird measurements, on the order of 8 or 9 feet. Strange. I turned the gain up a bit, which keeps those erratic measurements from (...) (28 years ago, 14-May-96, to lugnet.robotics.handyboard)
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