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 22:21:08 GMT
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Viewed:
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2819 times
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In lugnet.robotics, Justin Fisher wrote:
>
> 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.
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 make the electronics in the RCX's IR sensor recognise the signal. With
everything elso going on in the NXT, that may prove difficult.
JB
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Message is in Reply To:
 | | Re: The NXT bit of information...
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| (...) 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" (...) (19 years ago, 24-Feb-06, to lugnet.robotics)
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