Subject:
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Re: Sensor Reliability
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 7 Feb 2000 15:58:42 GMT
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Viewed:
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1433 times
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John Barnes <lego-robotics@crynwr.com> wrote in message
news:3.0.32.20000207084755.00f142b8@mailserver...
> 1. For active sensors like the light sensor, "Lego" don't regulate
> the power to the LED. So it's output amd thus the overall
> response is sensitive to battery voltage. Tut tut!
The RCX power signal is not regulated but LEGO has a current regulator that
is shared between the phototransistor and the LED in the light sensor. It's
a interesting combination, the brigher the light entering the
phototransistor the dimmer the LED will be. If you shine a laser pointer
into the phototransistor, the LED won't get enough current to even light up.
I've never noticed that the LEGO light sensor was all that sensistive to
battery voltage. More on the LEGO light sensor @
http://www.plazaearth.com/usr/gasperi/light.htm
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Message is in Reply To:
 | | Re: Sensor Reliability
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| I have also noted these effects and I don't think they are due to the wire length. There are two things doing this; 1. For active sensors like the light sensor, "Lego" don't regulate the power to the LED. So it's output amd thus the overall response (...) (25 years ago, 7-Feb-00, to lugnet.robotics)
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