Subject:
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Re: Stupid multiple sonars...
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 10 Feb 1999 18:33:09 GMT
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Original-From:
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William Bain <willbain@cs.umt.edu+avoidspam+>
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Viewed:
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1121 times
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Ian Hojnicki <damasta@camelot.bradley.edu> wrote:
> I guess I have a really simple question to ask... I know that I can
> share many of the lines off of the SPI in order to hook up two polaroid
> sensors... However, is it really necessary to add a diode to each of the
> ECHO lines? If so, what are the specs for those diodes? I am basing the
> fact that I can use D3 for the additional INIT line for the second
> sonar. IS THIS CORRECT?
It is correct that you can use the remaining SPI pins as digital outs to
trigger a second sonar. I've done it and it works fine.
It's also true that there *is* signal contention on the echo lines if you
simply plug 'em both into the same TIC port. I don't yet know whether
diodes will fix the problem, but I'll give it a try and let you all know.
--Will
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Message is in Reply To:
 | | Re: Stupid multiple sonars...
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| a small signal diode like 1N914 should do. -----Original Message----- From: Ian Hojnicki <damasta@camelot.bradley.edu> To: handyboard@media.mit.edu <handyboard@media.mit.edu> Date: Tuesday, February 09, 1999 12:16 AM Subject: Stupid multiple (...) (26 years ago, 9-Feb-99, to lugnet.robotics.handyboard)
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