Subject:
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Re: measure distance traveled
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Tue, 11 Feb 2003 18:45:29 GMT
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Reply-To:
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bb@[StopSpammers]bb-zone.com
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Viewed:
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2993 times
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On Tue, 2003-02-11 at 01:07, Unknown wrote:
> Hi all,
>
> I'm a CS student and I have to complete a practical assignment in which a robot
> has to drive 1 meter straight forward, make a 90 degrees turn and then drive
> another meter (course administrators will also place obstacles which have to
> be avoided, but that's not important for my question). My question is about
> the distance traveled by our little friend the robot: how can we measure
> this? I was thinking of the following:
>
> - We let the robot drive with an arbitrary fixed speed.
> - Measure how long it will take to drive 1 meter.
> - Let's say 1 meter is reached within 10 seconds, we know the robot travels
> 10 cm per second.
> - Now multiplying the time in seconds the robot has driven by 10cm we obtain
> the distance traveled in total.
>
> I quess this should work, but I was just wondering if someone has a better
> idea. By the way, I don't have a sensor to measure the RPM.
I'd use a dual differential drive with (one motor fwd/rev, one motor
turns) to ensure a straight line of travel and the a rotation sensor to
measure the wheel rotations. If you don't have a rotation sensor use a
light sensor to emulate one. with this kind of gearing you can easily
measure both distance traveled and degree turned.
With two rotation sensors you can get an even more elegant solution by
counting each wheels rotation separately and use a regular differential
drive which gives you the advantage of more force on the wheels.
BB
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