Subject:
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Re: moving in a straight line with two motors?
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 14 Nov 1998 02:18:54 GMT
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Viewed:
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2044 times
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Ardjan Besse wrote in message <364c7d42.4532817@lugnet.com>...
> Sounds good, but the driving will be a stop-and-go movement.
>
> Another idea: what about making a vehicle with a reptile-like movement, four
> wheels, on two parts of the vehicle, where the vehicle has a bending
> mechanism. And when you put a kind of light one the front, and a
> light-sensor on the back, with a kind of tube in between, you can check the
> amount of light to check if the machine is moving straight.....
"Straight" is a relative term. For example, while the alignment
might be 0straight, the wheels might not provide the bot with the
ability to travel in a straight line.
I believe that depending on a passive system to travel in a
straight line is not very possible. Even if you build a system
with incredible small tolerances, you are still going to end up
with something that produces drift in one direction or another.
The answer lies with reactive design. Think about the way we
drive a car. We "close the loop", providing the feedback that
enables the car to drive a "straight line" (or more to the point,
"follow a path"). When we drive, we watch the road and constanly
make adjustments to the steering wheel to ensure that the car is
following the path. There are just too many factors that will
not allow a car (which does have excellent mechanical tolerances)
to drive itself in a straight line, some of these factors don't
even have to do with car, but can be external in nature (e.g.,
the terrain, rocket-propelled grenades, other vehicles, etc).
>
> Ardjan
>
> -----
> Ardjan's YALP (Yet Another Lego Page) at
> http://unet.univie.ac.at/~a8705125/ardjan
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Message has 1 Reply:
 | | Re: moving in a straight line with two motors?
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| (...) 1) You've been playing too much Carmageddon. 2) Control theory is relatively new (it paces the development of computers). There are quite a few good textbooks available, but a professor is a much greater help. Familiarity with calculus and (...) (26 years ago, 14-Nov-98, to lugnet.robotics)
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Message is in Reply To:
| | Re: moving in a straight line with two motors?
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| Op een zekere dag, te weten Fri, 13 Nov 1998 17:21:08 GMT, klom lego-robotics@crynwr.com (Alex Wetmore) in het toetsenbord en schreef ons: (...) But you don't have to drive two weels. When you make one wheel for steering (thus making a (...) (26 years ago, 13-Nov-98, to lugnet.robotics)
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