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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Fri, 28 Feb 1997 23:31:57 GMT
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Original-From:
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Chris Moore <cmoore@cancun.rose!NoMoreSpam!.hp.com>
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Viewed:
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2396 times
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On Feb 28, 3:02pm, MAR ERICSON wrote:
> Subject: Re: IR Collision avoidance
> >
> > 220 Ohm
> > o--------/\/\/\--------------+-------------+---------------+
> > J7 o (LED) (LED) (LED)
> > o----------------------------+-------------+---------------+
>
>
> What are the three LED's for?
Those are the IR LED's - the one's that transmit the IR light that the
receiver sees.
Also, while I'm at it, I found out that the diagram above isn't completely
accurate (I drew it from memory). The circuit I really use is like this:
o-------------------+--------------+--------------------+
J7 o | | |
o--------- / / /
| \ \ \
| 2.2K / 2.2K / 2.2K /
| \ \ \
| | | |
| (IR LED) (IR LED) (IR LED)
| | | |
-----------+--------------+--------------------+
Chris
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Message has 1 Reply:
 | | Re: IR Collision avoidance
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| Hmmm. What voltage and/or LEDs are you using? Assuming 5V, your LEDs age passing only around half a milliamp of current. I am using a 100ma LED and I can only get less than a foot of detection. Am I missing something here? Jun Nolasco (...) (28 years ago, 1-Mar-97, to lugnet.robotics.handyboard)
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