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, 12 Mar 1997 23:52:59 GMT
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Original-From:
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Sriram Tirunellayi <sriram@ds5500.cemr.NOSPAMwvu.edu>
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Viewed:
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1559 times
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>
My question is...in the first diagram (below) the resistance is 220
ohm ie 0.2KOhm
But in the second diagram the resistances are 2.2KOhm
Which is the correct one?
------------------------------------------------------------------------
> 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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| (...) Resistors in series with LEDs are generally current limiters, meaning that the LED is very low resistance when conducting, so the resistor is the determinant of current flow. With the little colored LEDs I teach my students to hook up a 1K pot (...) (28 years ago, 13-Mar-97, to lugnet.robotics.handyboard)
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