Subject:
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Non-polaroid Sonar
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 15 Mar 2000 13:44:57 GMT
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Original-From:
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Adam Oliver <oli@!StopSpammers!wantree.com.au>
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Viewed:
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1014 times
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Greetings all,
I've just finished building Kam Leang's sonar circuit as published on his web
site, and it all seems to be working well. I am having a problem interfacing it
to the handyboard however.
I'm not entirely sure how to set bits high and low etc on the SPI port, which is
where I intend to hook this up. I have looked at the other sonar code thats
around, but it hasn't been of much help.
This particular circuit doesn't use any kind of inhibitor to remove extreme
close range signals. All I need is a ping out, then to count time before it
bounces back. All the examples I've seen have used a rising edge signal, however
this circuit is normally high and drops low when an echo is detected. The pink
book just confused me even more (I hate to say).
Could anyone out there give me a few pointers of what bits need
setting/resetting, and how to go about it? It would be greatly appreciated.
thanks
Adam
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Message has 1 Reply:
 | | Re: Non-polaroid Sonar
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| In the sonar code from the web site, the rising edge detection on timer input channel 3 (TIC3) is set like this: bit_clear( 0x1021, 2 ); bit_set( 0x1021, 1 ); According to the little pink book, address 0x1021 is the Timer Control Register 2 (TCTL2) (...) (25 years ago, 15-Mar-00, to lugnet.robotics.handyboard)
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