Subject:
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Re: Working around the 3 output limitation
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 6 Jan 1999 18:46:13 GMT
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Original-From:
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John A. Tamplin <jat@+NoMoreSpam+traveller.com>
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Viewed:
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1211 times
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On Wed, 6 Jan 1999, S. Crawshaw wrote:
> Someone mentioned a few days back that for a mobile robot you need to use
> 2 outputs for the motors. I reckon you can get around that on the proviso
> that you *don't want to stop* one of the motors...
Another option is to use "half motors" -- ie, if you are using 360
degree 4-wheel steering and driving all four wheels, those drive wheels
never need to go in reverse. You can use a differential and two ratchets
to separate the forward motion from the reverse motion.
You can also use one motor (or "half motor") to change gears to redirect
the output of another motor to numerous other things, but only one at a time.
For example, given the example above, use reverse on the main drive motor
to change gearing for a third motor to multiple arms, gripper, etc. You
need some way of telling where that shifter is, so you probably need one
or more touch sensors (from what I have seen relying on timing will
eventually get you in trouble, the motors just aren't that precise) which
probably means you need one of the switch muxes that have been discussed
here.
John A. Tamplin Traveller Information Services
jat@Traveller.COM 2104 West Ferry Way
256/705-7007 - FAX 256/705-7100 Huntsville, AL 35801
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 2 Replies:
 | | Re: Working around the 3 output limitation
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| This is a little ramble on the subject. The ideas in the later posts of this thread are in my opinion what Lego **is**. It is innovation in the face of "limited" options. It is creativity and problem solving. When I bought my Mindstorms it said (...) (26 years ago, 6-Jan-99, to lugnet.robotics)
| | | Re: Working around the 3 output limitation
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| (...) I've got an working design that SEEMS to get around the problem of cumulative error. I use a gear plate that sits atop a regular gear. Since it's held in place by gravity, when it hits the limit of travel it simply slips. This allows me to (...) (26 years ago, 7-Jan-99, to lugnet.robotics)
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Message is in Reply To:
| | Working around the 3 output limitation
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| Someone mentioned a few days back that for a mobile robot you need to use 2 outputs for the motors. I reckon you can get around that on the proviso that you *don't want to stop* one of the motors... Make your chassis like a car, with rack-and-pinion (...) (26 years ago, 6-Jan-99, to lugnet.robotics)
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