Subject:
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Re: light sensor question
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Sat, 26 Jul 2003 12:36:38 GMT
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Viewed:
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3274 times
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"Jona" <jona@24tooth.com> wrote in message news:HIM3z8.t92@lugnet.com...
> I am experimenting with some LEDs trying to get the light sensor to • react and it
> seems to only see the light when it is "looking" directly into the • LEDs.
> However, with a similar sized incandescent bulb, the sensor reacts to • the light
> even if the sensor is shrouded and the light is at an angle. Is there • something
> special in either the light given off by the LEDs or in the light
sensor itself?
I suspect that the spectral composition of the lights are quite
different. As to what the difference is, I have no clue. But it should
be available somewhere.
Along the same lines, the technical answer to the original question is
the response curve of the light sensor. This should also be available.
Does anyone know? [Does the light sensor use photo-transistors from a
fixed manufacturer, or does it change over time?]
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Message has 1 Reply:
 | | Re: light sensor question
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| (...) A friend of mine suggests that the poor response of the sensor to the LED is because the light from the LED is a single color. Where as the light from the incandescent bulb is white light which apparently contains many if not all of the (...) (21 years ago, 29-Jul-03, to lugnet.robotics.rcx)
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Message is in Reply To:
| | Re: light sensor question
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| (...) Here is another question...does incandescent light differ from the light given off by LEDs in terms of how the light sensor sees it? I am experimenting with some LEDs trying to get the light sensor to react and it seems to only see the light (...) (21 years ago, 26-Jul-03, to lugnet.robotics.rcx)
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