Subject:
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Re: Newbie needs Help (diff sensor)
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 6 Jun 2006 21:03:06 GMT
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Original-From:
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Mr S <SZINN_THE1@YAHOO.nospamCOM>
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Viewed:
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3934 times
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Some varied thoughts here:
> One rotation sensor and a differential will allow you to compare the rotation of
> two wheels. If the driven wheel and the undriven wheel come in the two sides of
> the differential, and the rotation sensor is connected to the drive ring, then
> the rotation sensor will only rotate if the wheels are going different speeds.
> In theory, you should be able to tell forward slip from the backward slip of
> being pulled by the other bot. In theory. I haven't tried it.
I might be wrong, but my understanding of the Lego differential gearing
is that if both shafts are turning at the same rate and direction, the outer
gear/shell will turn at the same rate as the axles. Only when the two shafts
are turning in opposite directions at equal rates will the outer gear stand still.
> > Finally, remember, you can mechanically connect all the motors together, so
> > they are driving the same wheels. This assures all wheels are getting the
> > maximum amount of power.
Putting two standard gear motors on one RCX output port will increase the
combined output to approximately 1.4 times a single motor. The RCX does
not supply enought current to handle a stall condition of two motors on one
port. RCX output =~ 500 ma Motor stall current =~ 350+ ma
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Message has 3 Replies:
 | | Re: Newbie needs Help (diff sensor)
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| (...) I think you need another pair of gears on one of the wheels to reverse its direction. If you are going to use a rotation sensor to measure the slippage then you need to realise that the sensor is notoriously poor at very low speeds. You'll at (...) (18 years ago, 6-Jun-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: Newbie needs Help
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| (...) One rotation sensor and a differential will allow you to compare the rotation of two wheels. If the driven wheel and the undriven wheel come in the two sides of the differential, and the rotation sensor is connected to the drive ring, then the (...) (18 years ago, 6-Jun-06, to lugnet.robotics)
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