 | | RE: Light sensor values
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One the raw note, my CdS cell (which measures about 20K ohms in the near dark, and about 500 ohms pointed at the florescent light) returns raw values between 1000 (pointed into a dark blue coffee cup) to 48 (pointed directly at the light with a (...) (25 years ago, 17-Sep-99, to lugnet.robotics)
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| | Re: Light sensor values
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(...) dark, and about 500 ohms (...) into a dark blue coffee cup) to (...) this large dynamic range to (...) I have a CdS based light sensor but do not use it often because of the slow response to changing light conditions. I know CdS cells can vary (...) (25 years ago, 17-Sep-99, to lugnet.robotics)
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| | color sensor: was ( Light sensor values)
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(...) It seems like you could get about 3-4 bits for each color if you were only using one input port. That's not very good resolution. Perhaps a better way would be to design a color sensor and use a pic chip for it's brain. It could sample all (...) (25 years ago, 18-Sep-99, to lugnet.robotics)
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| | Re: Light sensor values
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Richard <richard@mailstart.com> wrote in message news:FI88pu.4Js@lugnet.com... (...) when (...) cells? CdS sensors are pretty slow, but I don't think the ones I'm using take 5 seconds. I have used the Radio Shack 276-1657 and the Mouser 338-54C348 (...) (25 years ago, 18-Sep-99, to lugnet.robotics)
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| | Re: color sensor: was ( Light sensor values)
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Pure-Lego (but more than one input/output unless a motor can be driven off of the output to a light sensor and the input from a light sensor and rotation sensor can be multiplexed): 1) 1 light sensor 2) 1 (micro)motor to drive the rotation of the (...) (25 years ago, 18-Sep-99, to lugnet.robotics)
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| | Re: color sensor: was ( Light sensor values)
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More simlple : use the sensor input mux by Michael Gasperi. You can easily connect 3 (up to 7) passive sensors to one RCX input. I've completed mine, but didn't test it already. "Stephen P. Gibbons" a écrit : (...) ---...--- Philippe Jadin (...) (25 years ago, 18-Sep-99, to lugnet.robotics)
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| | Re: color sensor: was ( Light sensor values)
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Stephen P. Gibbons <lego-robotics@crynwr.com> wrote in message news:37E361B0.6CA5FE...ech.net... (...) of the (...) sensor can (...) given (...) You have a good idea, but the LEGO light sensor is a silicon photo transistor which is mostly sensitive (...) (25 years ago, 18-Sep-99, to lugnet.robotics)
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| | Re: color sensor: was ( Light sensor values)
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Michael Gasperi <gasperi@alynk.com> wrote in message news:FIA3zE.1Fn@lugnet.com... (...) off (...) I fixed up the spectral response chart on my CdS page to make the point more clear. (URL) (25 years ago, 19-Sep-99, to lugnet.robotics)
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