 | | [PDF] step-by-step Grabber Arm instructions from legomindstorms.com
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Hello, Lego just released ((URL) step-by-step instructions for building a Grabber Arm, for its march contest subject. Unfortunately, they have again provided them as online instructions, in html format. So, I've created a pdf file including these (...) (26 years ago, 1-Feb-00, to lugnet.robotics.rcx)
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| | Re: Black
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Mike W. Burger <mike@hawaii.edu> schrieb in im Newsbeitrag: Fp0ys8.CB0@lugnet.com... (...) The colors we see lie in the range 400 to 700 nanometers. The response of the Lego sensors are completely different to our "sensors". This is why some of the (...) (26 years ago, 28-Jan-00, to lugnet.robotics.rcx)
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| | Re: Ultimate Expansion set Remote Control?
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The item is the 5206 Speed Computer. You can look it up in the catalog section at (URL) also appears here: (URL) lugnet.robotics.rcx, Mike Burger writes: [snip] (...) [snip] (26 years ago, 30-Jan-00, to lugnet.robotics.rcx)
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| | RCX.pm 0.5 Released
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I would like to announce the release of the first version of my RCX.pm perl module, version 0.5. This module allows you to communicate with your RCX using perl. It has been developed and tested under Linux, though it might run under other UNIX's. (...) (26 years ago, 29-Jan-00, to lugnet.robotics.rcx)
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| | Re: lego photo scanner...
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Jay <getochkn@home.com> wrote in message news:Fp0z10.D4H@lugnet.com... (...) The LEGO light sensor is a silicon phototransistor which is mostly sensitive to infrared light. It would be very insenstive to blue light. There is some more information (...) (26 years ago, 29-Jan-00, to lugnet.robotics.rcx.nqc, lugnet.robotics.rcx)
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| | Re: Black
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(...) True, I was shocked at all the colors that were "white". I think part of this is due to the poor quality of the construction paper. Close examination indicates a fair amount of unstained fiber, for instance the black read a lousy 47, compared (...) (26 years ago, 29-Jan-00, to lugnet.robotics.rcx)
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| | Re: Black
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(...) Keep in mind that the light sensor generates a red light, so you're really measuring the reflectivity of the target in the red part of the spectrum. Thus red is as reflective as white (some of the other results, e.g lavendar, are still pretty (...) (26 years ago, 29-Jan-00, to lugnet.robotics.rcx)
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| | Re: Black
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I attempted to do the "black vinyl between LED and sensor" modification that Ralph Hempel documents on his site, but I was unable to get the vinyl to slide between the LED and the sensor (too tight a fit). So I used a small wire (toothpick would do (...) (26 years ago, 28-Jan-00, to lugnet.robotics.rcx)
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| | lego photo scanner...
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has anyone thought of an advantage to using two light sensors in the basic photo scanner robot that people have built. I'm working on one right now (mostly the vb programming right now for the pc side and pqc for the rcx). i have two kits to use, so (...) (26 years ago, 28-Jan-00, to lugnet.robotics.rcx.nqc, lugnet.robotics.rcx)
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| | Black
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Since I am currently working on line following, I did some tests with the Lego active light sensor. I mounted one on a small test cart pointing down a bit more than 1/8 inch above the "ground". The 1.5 test pad reads white 57 black 38 green 46 I (...) (26 years ago, 28-Jan-00, to lugnet.robotics.rcx)
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