 | | light sensor question —Katie Panciera
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| | | I am writing a research paper about work I have done with Mindstorms this summer. One thing that I used a lot was the light sensor, but I am having a hard time finding what exactly the sensor measures. I was wondering if anyone could give me any (...) (21 years ago, 23-Jul-03, to lugnet.robotics.rcx)
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| | | | | Re: light sensor question —Aaron Goodman
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| | | | (...) Is this what your looking for? (URL) terms of what units it mesures it in I don't think it really has any. it is just a relative reading from 0-100. (21 years ago, 23-Jul-03, to lugnet.robotics.rcx)
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| | | | | | Re: light sensor question —Katie Panciera
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| | | | (...) What I'm looking for is really the latter of the topics. It seems to me that it must have some sort of units, because I've never seen it hit zero even with alterations (as Ralph Hempel has described on his site). It seems like it should be (...) (21 years ago, 23-Jul-03, to lugnet.robotics.rcx)
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| | | | | | Re: light sensor question —Aaron Goodman
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| | | | (...) The Analog to Digital converter of the h8/300 (the brains of the lego mindstorms) is 10 bits, so it has a range of 0-1023. I'm not sure how it converts that to the 0-100, it may do it by just dividing by 10 and rounding. If you want to see (...) (21 years ago, 24-Jul-03, to lugnet.robotics.rcx)
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| | | | | | Re: light sensor question —Juergen Stuber
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| | | | | (...) According to Kekoa Proudfoot's RCX Internals webpage ((URL) if (raw < 187) // bug? this allows percent=101, should be raw < 189 sensor->value = 64 else sensor->value = (3ff - raw) * 19 / 9c Numbers are in hexadecimal (base 16). Jürgen (21 years ago, 24-Jul-03, to lugnet.robotics.rcx)
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| | | | | | Re: light sensor question —Jona Jeffords
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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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| | | | | | Re: light sensor question —Vidhyanath Rao
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| | | | "Jona" <jona@24tooth.com> wrote in message news:HIM3z8.t92@lugnet.com... (...) react and it (...) LEDs. (...) the light (...) something (...) sensor itself? I suspect that the spectral composition of the lights are quite different. As to what the (...) (21 years ago, 26-Jul-03, to lugnet.robotics.rcx)
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| | | | | | Re: light sensor question —Jona Jeffords
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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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| | | | | | Re: light sensor question —Magdalena Kogutowska
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| | | | (...) I've done a lot of readings with the light sensor and analysed them. If you want to have a look you can go to (URL) . If you look in the appendix of that document you'll find information on the light sensor (and many other things...) Magdalena (21 years ago, 31-Jul-03, to lugnet.robotics.rcx)
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