Subject:
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Re: Light sensor initialization?
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Thu, 15 Jul 1999 14:42:17 GMT
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Reply-To:
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MATTDM@MATTDM.stopspamORG
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Viewed:
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4192 times
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Jonathan Knudsen <jonathan@oreilly.com> wrote:
> Matthew's program takes one reading at initialization time to
> determine a baseline value. Any reading that falls 7 units
> below this is assumed to be a dark line.
> I take a somewhat more conservative approach, taking 10
Wow. I feel I should point out that experimentally my method works 100% of
the time. :)
On the other hand, mine is a special-case application: the light sensor is
used to read color values from a surface, which presumably will have very
little variation. If you're looking to get ambient light level in a room,
for example, the more complicated code is probably justified.
> 1. You might want to run your robot at different times of day and have it
> work right. Hardcoded values will probably fail you here.
> 2. Different light sensors produce different readings for the same amount
> of light. Doing a runtime calibration increases the chances that your
> program can work on someone else's robot.
3. You sometimes run your robots on nice white paper, and sometimes you have
brown packing paper. :)
--
Matthew Miller ---> mattdm@mattdm.org
Quotes 'R' Us ---> http://quotes-r-us.org/
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Message is in Reply To:
 | | Re: Light sensor initialization?
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| Matthew's program takes one reading at initialization time to determine a baseline value. Any reading that falls 7 units below this is assumed to be a dark line. I take a somewhat more conservative approach, taking 10 readings over one second and (...) (27 years ago, 15-Jul-99, to lugnet.robotics.rcx)
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