Subject:
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Re: Shutting off illumination LED on Light Sensor for LIDAR
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 31 Mar 2001 06:35:03 GMT
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Viewed:
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589 times
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> Someone else mentioned that LegOS is able to read the light
> sensor 'passively' without illuminating the LED. Any LegOS
> folks here know what they do differently?
I strongly suspect this is a myth. A transistor is a transistor is a
transistor. They all require biasing in order to function properly and
that requires power. Mind you, even so-called passive devices must
either generate a voltage or have a voltage present in order to read
their value, and it's probably that reduced voltage that is in fact
powering the light sensors. Not a high enough voltage to light the LED
(min 1.2V - more likely 1.9V - I haven't tried it yet) but enough to
get the photo-transistor biased (but not properly), Hence a weak and
non-linear reading.
Matthias Jetleb
VA3-MWJ
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15 Messages in This Thread: ![Shutting off illumination LED on Light Sensor for LIDAR -lego-robotics@crynwr.com (Chris 'Xenon' Hanson) (28-Mar-01 to lugnet.robotics)](/news/x.gif) ![](/news/246.gif) ![Re: Shutting off illumination LED on Light Sensor for LIDAR -Andy Gombos (28-Mar-01 to lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: Shutting off illumination LED on Light Sensor for LIDAR -lego-robotics@crynwr.com (Chris 'Xenon' Hanson) (28-Mar-01 to lugnet.robotics)](/news/x.gif)
![](/news/x.gif) ![](/news/268.gif) ![Re: Shutting off illumination LED on Light Sensor for LIDAR -Gustav Jansson (28-Mar-01 to lugnet.robotics)](/news/x.gif)
![](/news/x.gif) ![](/news/268.gif) ![Re: Shutting off illumination LED on Light Sensor for LIDAR -Henry Chea (28-Mar-01 to lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: Shutting off illumination LED on Light Sensor for LIDAR -Tim Byrne (28-Mar-01 to lugnet.robotics)](/news/x.gif)
![](/news/x.gif) ![](/news/268.gif) ![Re: Shutting off illumination LED on Light Sensor for LIDAR -Bernardo Dal Seno (28-Mar-01 to lugnet.robotics)](/news/x.gif)
![](/news/x.gif) ![](/news/268.gif) ![Re: Shutting off illumination LED on Light Sensor for LIDAR -Philippe Hurbain (29-Mar-01 to lugnet.robotics)](/news/x.gif)
![](/news/x.gif) ![](/news/68.gif) ![Re: Shutting off illumination LED on Light Sensor for LIDAR -Troy McLucas (29-Mar-01 to lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: Shutting off illumination LED on Light Sensor for LIDAR -lego-robotics@crynwr.com (Chris 'Xenon' Hanson) (29-Mar-01 to lugnet.robotics)](/news/x.gif) ![](/news/246.gif) ![Re: Shutting off illumination LED on Light Sensor for LIDAR -Bernardo Dal Seno (29-Mar-01 to lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: Shutting off illumination LED on Light Sensor for LIDAR -lego-robotics@crynwr.com (Chris 'Xenon' Hanson) (30-Mar-01 to lugnet.robotics)](/news/x.gif)
![](/news/x.gif) ![](/news/x.gif) ![](/news/68.gif) ![You are here](/news/here.gif) ![](/news/46.gif) ![Re: Shutting off illumination LED on Light Sensor for LIDAR -Juergen Stuber (1-Apr-01 to lugnet.robotics)](/news/x.gif) ![](/news/46.gif) ![Re: Shutting off illumination LED on Light Sensor for LIDAR -lego-robotics@crynwr.com (Chris 'Xenon' Hanson) (2-Apr-01 to lugnet.robotics)](/news/x.gif)
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