Subject:
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Re: LEGO Computers & Logic Gates
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Newsgroups:
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lugnet.technic
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Date:
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Sun, 21 Mar 2004 12:02:51 GMT
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Viewed:
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2239 times
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> In lugnet.technic, Martin Howard wrote:
> >
> > > > I've tried to do it mechanically. So far I've made NOT, AND, NAND, OR,
> > > > NOR, a basic NAND latch (flip-flop) and a clocked NAND latch.
> > > >
> > > > Full details can be found via the LEGO link at my webpage:
> > > >
> > > > http://www.goldfish.org.uk
> In our pneumatic gates, we can sometimes use pressure directly
> from the pumps as inputs to pneumatic switches, thus providing
> the "amplification" people are talking about.
>
> In my most recent pneumatic gate designs, inputs come in as
> pressure to a pair of pistons. The pistons control the switch
> outputs of the gate. The pressure into these switches comes
> directly from the pumps. This way pressure only goes
> from one switch to one or more pistons (in parallel). This gives us fresh
> pressure at each gate level. This "fresh pressure" represents the V+ or
> amplification people are talking about.
>
> However, Mark Tarrabain, the most clever pneumatic circuit designer
> I ever met that owns no actual pneumatic parts :^), invented a single
> piston single switch
> AND gate. Brilliant. Stringing these gates together into larger circuits
> leaves you with the same results.... "fresh pressure" from the pumps is
> introduced in very few places in the circuit. In the case of
> pneumatics, this means slower switching times, because you are having
> to fill larger volumes with pressurized air.
>
> If you are trying to make a mechanical half adder, you might step back and look
> at the inputs and outputs without thinking of composing the circuit out of
> AND/OR/XOR/NOT circuits.
>
> Mark did this with pneumatics and made the most efficient design. I tried to
> beat him, I really did, but every time I bested him, he'd figure out how to use
> my new trick to best me.
>
> It is very cool to see other logicians in the technic group.
>
> Great work.
>
> Kevin
Thanks for the comments, hints and suggestions. Designing something without
the pieces - that's impressive! I think the idea of a motor to amplify the
signal could be used and it should be possible to put in some sort of lever that
switches the motor direction depending on whether a 1 or a 0 is wanted - then to
turn the motor off ... well I have a week or so of leave comming up for that ;-)
Martin
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Message is in Reply To:
 | | Re: LEGO Computers & Logic Gates
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| (...) This is the same thing as the amplification issue mentioned in other posts. In our pneumatic gates, we can sometimes use pressure directly from the pumps as inputs to pneumatic switches, thus providing the "amplification" people are talking (...) (20 years ago, 16-Mar-04, to lugnet.technic)
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