Subject:
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Re: The NXT bit of information...
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 24 Feb 2006 20:48:42 GMT
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Viewed:
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2299 times
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In lugnet.robotics, Philippe Hurbain wrote:
> > > Maybe... maybe that sensor is fast enough to establish a bidirectionnal IR link
> > > with a RCX???
> >
> > Ergh,
> >
> > Take a close look at some of the pictures to found online. The LED isn't IR, its
> > a regular old red LED.
>
>
> You are right, John! I was fooled by their text description: "It is also
> possible to turn off the infrared light source that is located below the
> sensor(...)"
>
> Philo
I imagine there is a fair chance the RCX IR sensor can see the red LED, it just
wouldn't register as brightly, so the range would be greatly reduced. LEDs can
have a pretty narrow spectra, but sensors generally just have more of an
"optimum" wavelength. The IR filter that is part of the RCX exterior casing is
probably the real obstacle, and worst case, that can be easily and temporarily
removed without damaging the unit.
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Message has 1 Reply:
 | | Re: The NXT bit of information...
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| (...) The 38kHz receiver module in the RCX is also encased in IR filter material :( However, the real trick will be getting the sensor's LED to turn on and off at 38kHz. You will have to change the LED state every 13uS with good accuracy in order to (...) (18 years ago, 24-Feb-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: The NXT bit of information...
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| (...) You are right, John! I was fooled by their text description: "It is also possible to turn off the infrared light source that is located below the sensor(...) " Philo (18 years ago, 24-Feb-06, to lugnet.robotics)
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