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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Wed, 28 Mar 2001 23:36:39 GMT
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Viewed:
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1855 times
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lego-robotics@crynwr.com (Chris 'Xenon' Hanson) writes:
> Has anyone successfully found a way (short of paint, or cutting
> internal wiring) of shutting off the red 'supply light' LED on the
> Lego light sensor?
>
> Alternately, if I can figure out what the photodiode part is, and
> how it's wired, I could just build my own passive-only sensor that
> would be level-compatible with the Lego part.
You can find light sensor schematics on Michael Gasperi's page:
http://www.plazaearth.com/usr/gasperi/light.htm
> Using the RCX IR emitter as the illumination source. Don't know
> exactly how to just jam it 'on' like a light connected to an output
> port, and don't know it's comparative power. This would give me one
> additional output port free if I didn't need the Lego light, a big
> bonus. This would make the design more accessible to those who don't
> have the Lego Light part from Ultimate Accessory. Also, the annoying
> visible strobing of the Lego light would be eliminated, making it
> more of a (visibly) passive, 'stealthy' sensor. (This is what the
> Caterpillar One bot at http://www.rcx.ic24.net/catone.htm does, though
> the example code is very convoluted). This would be helped by turning
> off the light sensor's own light supply LED.
Someone has already tried this. You can check Simen Svale Skogsrud's page
for an example, with NQC code. There is currently a thread on the subject
in lugnet.robtics.rcx.legos if you are interested.
bye
Bernardo
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Message is in Reply To:
 | | Shutting off illumination LED on Light Sensor for LIDAR
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| Has anyone successfully found a way (short of paint, or cutting internal wiring) of shutting off the red 'supply light' LED on the Lego light sensor? The supply LED is great for active-detection situations, like line-following, when you need to (...) (26 years ago, 28-Mar-01, to lugnet.robotics)
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