Subject:
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Re: 2 motors, different speeds
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 28 Nov 2000 22:40:13 GMT
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Original-From:
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Andy Gombos <gombos_2000@&NoMoreSpam&yahoo.com>
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Viewed:
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729 times
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You can put rotation sensors on each wheel, and then monitor them for
changes. If one gets ahead of another, then slow that motor down. This works
well, but differences in the wheels cause it to turn slightly.
Andy
Eggers Tom W Civ USAFA/DFCS wrote:
> You are expecting too much. At the Air Force Academy
> we have 13 RIS kits, meaning 13 robots, and no two
> of them seem to work exactly the same. Not the motors,
> not the touch sensors, and not the light sensors.
>
> If you want a robot to go in a straight line, you must
> do something more complicated than wish:
>
> 1) Put a differential between the wheels and use a rotation
> sensor to detect turning. That will almost work, except
> the wheels don't have exactly the same sizes or traction.
>
> 2) If you want the robot to follow a line, then something
> adaptive, like a white-tape line and a light sensor, is
> necessary.
>
> The difference in motor power levels doesn't seem to make
> much difference, at least in the configuration we are
> using in the computer science lab. The highest power
> level is only slightly different from the lowest (non-zero)
> level. To get smooth differential steering, I used
> float on one wheel and high power on the other. High power
> on one wheel and low power on the other was way too slow.
> It's very possible, though, that the results I got were
> due to the gearing (very low) I was using.
>
> twe
>
> -----Original Message-----
> From: Tony Cha [mailto:gte004f@prism.gatech.edu]
> Sent: Monday, November 27, 2000 10:02 PM
> To: lego-robotics@crynwr.com
> Subject: 2 motors, different speeds
>
> I have two motors set to the same power levels, but one is always going
> slightly faster than the other. I've tried it at different power levels
> but still the same result. Am I expecting too much for them to go at
> the exact same speeds? Or am I overlooking something simple?
>
> Thanks.
> Tony Cha
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