Subject:
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Re: expansion board
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Sat, 15 Feb 1997 04:54:37 GMT
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Original-From:
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Chuck McManis <cmcmanis@netcom.com#spamcake#>
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Reply-To:
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cmcmanis@STOPSPAMnetcom.com
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Viewed:
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1320 times
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Bill Richman wrote:
>
> If it makes
> it through 5 or 6 of these random on/off cycles, I count it as a
> valid reflection detected. I thought I would have to play with it a
> lot to make it reliably detect its own transmissions and ignore
> outside IR interference, but it works flawlessly so far. It *always*
> sees its own reflection, and has *never* falsely triggered.
I can vouch for this technique, this is basically what I do in my
PIC program (except the randomness which is a nice touch BTW) and
get rock solid detections. When the frequency is spot on to the
center frequency (38Khz for the 1ISU60's) and using 100 mA drive
current into a Radio Shack hi-output LED I can detect walls at
8 feet! Using 33mA I get a nice solid detection at 3 to 4' with
only flat black items getting down to < 1'. I use this system
on my Wild Cougar robot quite successfully.
--Chuck
--
--Chuck McManis http://www.professionals.com/~cmcmanis/index.html
All opinions in this message are those of the author. No warranty as to
the suitability or accuracy is stated or implied. Use at your own risk.
cmcmanis@netcom.com +1.408.524.4805
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Message is in Reply To:
 | | Re: expansion board
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| I used the one available IR LED driver on the HB to drive a Radio Shack high-output IR LED. This, along with a Radio Shack IR decoder module (a little silver box about the size of a sugar cube that takes +5vdc and ground, and outputs a TTL level (...) (27 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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