Subject:
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Re: Sonar
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sun, 26 Mar 2000 16:45:47 GMT
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Original-From:
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Will Bain <willb@=spamless=selway.umt.edu>
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Viewed:
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1848 times
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Martin Ziegler wrote:
>
> Hi
>
> I've a Polaroid Sonar Ranging Modul. The longest distance I can mesaure is
> about 2,7 meters.
> In my opinion it's not the hardware, but as the result is an integer, so it
> can't be greater than 32768. Right?
> Has anybody developed another programm, to measure longer distances?
>
> Thanks
>
> Martin
That sounds correct. Someone else asked about that last year. Try searching the mailing list archives.
The problem is not just that the result is an integer, but that it's a signed integer. You effectively only get 15 bits of information out of it. If you could figure out a way to interpret the answer as an unsigned, then you could effectively get up to twice the maximum range.
Of course, that still wouldn't get you the maximum available from the hardware, about 10.6 meters. To do that, you'd need at least an 18-bit counter (i.e., a long integer). Perhaps you could figure out how to change just the IC code to count (in a separate variable) how many times the counter wraps around? Best of luck!
-- Will
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Message is in Reply To:
 | | Sonar
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| Hi I've a Polaroid Sonar Ranging Modul. The longest distance I can mesaure is about 2,7 meters. In my opinion it's not the hardware, but as the result is an integer, so it can't be greater than 32768. Right? Has anybody developed another programm, (...) (24 years ago, 26-Mar-00, to lugnet.robotics.handyboard)
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