Subject:
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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 06:07:52 GMT
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Original-From:
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Jeff Keyzer <{jkeyzer@}ihatespam{calweb.com}>
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Viewed:
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1557 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? :-)
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Message has 2 Replies:
 | | Re: 15' max measurement
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| (...) 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. (29 years ago, 14-May-96, to lugnet.robotics.handyboard)
| | | Re: 15' max measurement
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| (...) I just noticed that the Polaroid Specs say that the transducer pulse current is 2 A. 100mA idle. Since it was mentioned previously that the HB's VR is rated for 1 Amp, how would this affect the sonar? Perhaps whatever is left of the 1A (...) (28 years ago, 28-May-96, to lugnet.robotics.handyboard)
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