Subject:
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Re: Get 8 Outputs from RCX: A Pure-Lego Solution
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 3 Mar 2000 14:14:59 GMT
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Viewed:
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692 times
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I didn't look at the 2-way you mentioned but went into a 4-way specific which
uses only electric cables, polarity switches, gears, axles and technic beams
for a base. It worked! not only that but there is only a need for one 45 degree
meeting of axles. 2 switches on each side yeilded either 2 of 8 outouts OR 1 of
4 outputs and 1 of 4 inputs... I need MORE switches....
Using pbforth I implemented a "mode" switching command which tracks the sensors
and motors.
Thanks for the great idea!
-Rich
In lugnet.robotics, Hao-yang Wang writes:
> More precisely, here I am going to describe the way to make a 4-way power
> splitter. You can connect two splitters to the RCX to get 8 outputs in total.
> Within each of the two splitters, you can have one output among the four
> working at one time. This is better than the usual "1 among 8" argument.
>
> Due to the lack of parts I did not actually construct a working model. Please
> tell me if you think this design will work.
>
> First, you build a 2-way power splitter. The design is posted separately in
> lugnet.cad.dat . This 2-way power splitter is controlled by a polarity switch.
>
> Next, build another 2-way power splitter. Connect the axes of the polarity
> switches of these two splitters together, with 45 degrees of difference in the
> "phase" of the polarity switches. Also connect the two inputs together. This
> way you make a 4-way power splitters.
>
> Next, build another 4-way power splitters. Connect these two splitters to the
> RCX to get 8 outputs in total. Connect a motor to the third RCX output and use
> it to control these two splitters. There are several possibilities:
> 1) You may use one direction of the controlling motor to control the
> splitters, while using the other direction for something else, to have 8 1/2
> outputs in total.
> 2) You may use one direction of the controlling motor to control one splitter,
> while using the other direction on the other splitter, to get more • flexibility.
>
> You may need a angle sensor or a touch sensor to have a precise control over
> the controlling motor, but there are tricks to do away with this sensor. For
> example, the control motor can realign itself when it changes direction.
>
> You can use this design in, say, a robot arm, where there are lots of joints
> to control, but you need only one or two among them working at one time.
>
> Hao-yang Wang
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Message has 1 Reply:
 | | Re: Get 8 Outputs from RCX: A Pure-Lego Solution
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| (...) degree (...) of (...) sensors (...) Almost forgot... The side effect of the 2/4-way switches: one output is powered, other output from same switch is "braked", other two are free to move. I am looking at changing the design to "brake" all (...) (24 years ago, 3-Mar-00, to lugnet.robotics)
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Message is in Reply To:
| | Get 8 Outputs from RCX: A Pure-Lego Solution
|
| More precisely, here I am going to describe the way to make a 4-way power splitter. You can connect two splitters to the RCX to get 8 outputs in total. Within each of the two splitters, you can have one output among the four working at one time. (...) (25 years ago, 11-Mar-99, to lugnet.robotics)
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