Subject:
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Re: YAPNQ
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Newsgroups:
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lugnet.technic
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Date:
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Thu, 19 Jun 2003 21:06:18 GMT
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Viewed:
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995 times
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In lugnet.technic, Mark Tarrabain wrote:
> Kevin L. Clague wrote:
> > Mark,
> > I am impressed with this concept, and wanted to see if I could eliminate the
> > rubber bands and get back to a differential pair (standard LEGO pneumatic)
> > setup.
> >
> > To create the complement (in terms of pressure or not) you can use two
> > switches that are linked like one side of my mux. The switch handles are linked
> > *and* the two ports are linked.
> >
> > Drive piston with C1 (contraction) and X1 (expansion). Also run C1 into the
> > switch closest to the piston. Drive C2 (contraction) into the other switche's
> > (the other half of the two switch mux) input port.
> >
> > What you get out of the 2 switch mux is
> >
> > C C P
> > C X P
> > X C P
> > X X R
> >
> > where P is pressure and R is release.
> >
> > I'm at work, but as soon as I get home I'll upload a picture of it.
> >
> > Bottom line is...... two input AND gate with one piston, three switches, one T
> > and no rubber bands.
> >
> > I'm pretty sure OR is doable using one piston, three switches and a T no bands.
> >
> > XOR requires one piston, four switches, two Ts and no band.
> >
> > NOTs are free, just by reversing connections at the piston inputs.
> >
> > Thanks for showing me your single piston AND gate. It was very inspirational.
> >
> > I think I can now implement a full three bit binary adder in 3 pistons
> > (presuming that a piston can flip 7 switches) with no bands. This is down from
> > 15 in the last one I actually built, and down from 7 using my rubber band based
> > AND/XOR.
> >
> > Kevin
>
> Er... You can add 2 three bit numbers using that few components?!?!?
>
> (heavy sigh) Well... that totally blows anything away I think I could
> have come up with. My one-bit full adder (A+B+Carry in) alone used
> three pistons and 13 switches.
>
> I'm reluctant to admit it, but it appears that I have to. I'm
> hopelessly outclassed here. (chanting) I'm not worthy... I'm not
> worthy... :)
Uhhhh..... You are worthy. I can create a full adder (A+B+Carry in) in three
pistons, 17 switches (7+7+3) and no rubber bands. You win on switch count. I
win on band count. Rereading my post I can see how I led you astray.
Mark is worthy.... Mark is worthy.... Mark is worthy....
>
> > > Mark
Kevin
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Message has 1 Reply:
 | | Re: YAPNQ
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| (...) Egad! (insert pause for realization) And I'm back in the game! Well, rubber bands *are* cheaper'n switches, after all. :) My adder design doesn't *strictly* require rubber bands, but would require that all three pistons be "reset" at the end (...) (21 years ago, 19-Jun-03, to lugnet.technic)
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Message is in Reply To:
| | Re: YAPNQ
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| (...) Er... You can add 2 three bit numbers using that few components?!?!? (heavy sigh) Well... that totally blows anything away I think I could have come up with. My one-bit full adder (A+B+Carry in) alone used three pistons and 13 switches. I'm (...) (21 years ago, 19-Jun-03, to lugnet.technic)
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