Subject:
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Re: The latest rage in pneumatic computing
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Newsgroups:
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lugnet.technic, lugnet.robotics
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Date:
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Sat, 21 Jun 2003 22:17:16 GMT
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Viewed:
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226 times
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"Kevin L. Clague" <kevin_clague@yahoo.com> wrote in message
news:HGup2n.7Jv@lugnet.com...
> I created Mark Tarrabain's single pressure/single piston AND gate and have • it
> all four possible input states. In this case I use rubber bands to • compress the
> pistons, but this is not the only way to compress the pistons.
>
> http://www.brickshelf.com/gallery/kclague/Computing/mt-and-kmap.jpg
>
> Here is a picture of my additions to Mark's gate to make single • piston/dual
> pressure (works well with dual acting LEGO pneumatic pistons) AND gate. • By
> adding the two switches, I can create the pressure to close the pistons • (without
> using rubber bands).
>
> http://www.brickshelf.com/gallery/kclague/Computing/klc-and-kmap.jpg
>
> Here is my single piston/dual pressure OR gate. Same mechanics as the AND • gate,
> but with different connections.
>
> http://www.brickshelf.com/gallery/kclague/Computing/klc-or-kmap.jpg
>
> Here is my single piston/dual pressure XOR gate.
>
> http://www.brickshelf.com/gallery/kclague/Computing/klc-xor-kmap.jpg
>
> The AND and XOR can be driven by the same piston, so a full binary adder • can be
> created with three pistons, and 17 switches.
>
> Unfortunatly for me Mark can perform the same addition with 3 pistons and • 13
> switches plus rubber bands, or 3 pistons and 14 switches (one extra one to
> pressure the gates closed.)
>
> PLUKWYT
>
> Kevin
Good work, Kevin! I have not worked with AND OR & XOR logic for many years.
The old discrete component Bendix DynaPath Numerical controls used AND & OR
through out their systems. I think your pneumatic recreation is really
interesting. I am having trouble visualizing the full adder. I will have to
think about that a bit. Thanks for sharing your efforts.
--
Bob Fay
http://www.ozbricks.com/bobfay/
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Message has 1 Reply:
 | | Re: The latest rage in pneumatic computing
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| (...) You are welcome, and thanks Robert. The full adder has three inputs A,B and carry in, and two outputs sum out and carry out. SumAB = A XOR B Sum out = SumAB XOR Carry in Carry out = (A AND B) OR (SumAB AND Carry in) You need a total of 2 XOR (...) (21 years ago, 21-Jun-03, to lugnet.technic, lugnet.robotics)
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Message is in Reply To:
| | The latest rage in pneumatic computing
|
| I created Mark Tarrabain's single pressure/single piston AND gate and have it all four possible input states. In this case I use rubber bands to compress the pistons, but this is not the only way to compress the pistons. (URL) is a picture of my (...) (21 years ago, 21-Jun-03, to lugnet.technic, lugnet.robotics)
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