Subject:
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Re: IR Collision avoidance
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 5 Mar 1997 04:33:22 GMT
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Original-From:
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Adam <adam@ring.^Spamcake^zenox.com>
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Viewed:
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4412 times
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Matt,
You mentioned an IR device from Digi-key. Can you expand (part no.)
tel phone no. for Digi. Process analog info from IRs to digital data
for HB? What IRs are compatible and where might I get this stuff.
Your info into this would be greatly appreciated. Thanks.
On Mon, 3 Mar 1997, Matt Harlan wrote:
>
>
> Actually, I built the
> > portion of the transmitter that generates the 38Khz carrier, using a
> > single 555, and on the same board built the 567 portion of the
> > circuit, and then connected the signal on pin 5 of the 567 to pin 4
> > on the 555 to gate the 555 on and off at 200Hz. Since the 567 is
> > also generating the modulating frequency (a luxury you don't have on
> > a standard remote-control setup, since the transmitter and the
> > receiver are eletrically separate from each other), it doesn't even
> > matter if the frequency drifts, because the frequency the detector is
> > looking for will always match it. Feeding the output of one of the
> > IR sensors to the input of the 567 (as shown on the spec sheet)
> > allows the 567 to lock perfectly onto the modulated IR carrier, and
> > produces a solid TTL-level output that can be fed to the Handy Board.
>
>
> This is exactly the same scheme I use. I'm using an IR module from
> Digi-key that has a side view, and five IR LED's spread around the front of
> the module at different angles. I have quite a few outputs, thanks to a
> little harware hacking, so I just turn on each LED individually and look
> for a reflection. The onto the next LED. I can get a sweep from -60° to
> 60° this way.
>
>
>
> \ | /
> \ | /
> \ | /
> \ | /
> \ | /
> \ | /
> \ | /
> \ | /
> \ *** /
> * _ *
> |_|
>
> Kinda like this. *'s are LED'S. the square is the IR module
>
> Works pretty damn good. Adjust the LED current and you get a range from a
> few inches to a few feet. Increase the current through the side LED's and
> get better peripheral "vision".
>
> I said a couple weeks ago that I would post a schematic and PCB pattern for
> my sensor, and I will. Once my exams are over. I now realize that my
> configureation is not the best for everybody, that whole digital output
> thing. So, I'm working on a better way. Maybe something using the SPI.
> Might even wipe up some code too, but no promises.
>
> happy reflecting
>
> harlan
>
>
>
> _______________________
> Matthew J. Harlan
> Cornell University
> Electrical Engineering
> mjh10@cornell.edu
>
>
>
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Message is in Reply To:
 | | Re: IR Collision avoidance
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| Actually, I built the (...) This is exactly the same scheme I use. I'm using an IR module from Digi-key that has a side view, and five IR LED's spread around the front of the module at different angles. I have quite a few outputs, thanks to a little (...) (30 years ago, 3-Mar-97, to lugnet.robotics.handyboard)
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