Subject:
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Re: Help with my robot
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 14 Dec 2000 13:31:03 GMT
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Viewed:
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803 times
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In lugnet.robotics, Steve Baker <sjbaker1@airmail.net> writes:
> For steering, you could arrange to have just one narrow black strip
> on the detector wheel and use a differential connected to the two drive
> wheels to rotate our detector wheel. Then, when the robot is going
> straight, the black mark will remain under the light sensor. If the
> robot veers off to the left or right, the black stripe will no longer
> be under the light sensor. Unfortunately, you won't know whether to
> turn left or right to correct for this - so you may have to turn left
> for a little while - and if you don't see the black stripe, turn right
> until you see it. The software to do that turns out to be IDENTICAL
> to the code for a line-following robot!
I thought in the same direction. For driving straight you don't need a light
sensor (but for accurate turning) It must work with two touchsensors that were
touched from an arm placed on the "detector-wheel". So you are able to detect
to which side the robot "floats". The only thing you have to do is to drive it
with an torque gear, so that you can turn anyways.
If two light sensor are available your lightsensor solution is much better,
because you can use them to check (with a code on the detector-wheel) which
direction it turns and you can spin 180 degrees accurate by checking the
detector-wheel. (This is the same behavior a rotation sensor has --> this
also works with one rotation sensor !!!!).
(BTW if you own to lightsensors you than could have a look at both wheels and
don't need a hardware differentail.)
Tell me what you think.
Rainer
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Message has 1 Reply:
 | | Re: Help with my robot
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| (...) Yes - but that's using TWO inputs. With a little thought, you can actually get the direction from a single light sensor. Make your detector wheel white around one half and black around the other half. Looking at the wheel, you'd want: Light (...) (24 years ago, 15-Dec-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: Help with my robot
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| (...) As lots of other people have said - you really need rotation sensors. If you don't have one - then a line-follower is an option (as other people have also suggested)...or I *suppose* you could put a bright light at either end of your 15 foot (...) (24 years ago, 12-Dec-00, to lugnet.robotics)
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