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Kevin L. Clague wrote:
> AND takes 1 piston + 1 switch using your design.
>
> XOR takes 1 piston + 2 switches using my design.
Ah... it took me a while to figure out what you were doing, but I see
now... (reviewing your pics)
If your inputs to the XOR were A and B, you use A to drive the piston,
and require the presence of both B and NOT B to make the piston move. I
see what you were doing now.
Yeah... after my first round of pneumatic trials failed abysmally, I
tossed the idea of using or requiring inverted logic.
> Two half adders (2 + 6), plus one OR gate (1 + 2) totals 3 + 8.
So you can build a full adder with only 8 switches??? WOW.
>> Mark
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Message has 1 Reply:
 | | Re: A better full adder!
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| (...) Yes. B and NOT B into the mux formed by two switches that are arranged to never release. (...) But with LEGO pneumatics you can typically get it for free. (...) Yes. When I wrote my post up yesterday I'd forgotten that I needed NOT B as an (...) (21 years ago, 27-Jun-03, to lugnet.technic, lugnet.robotics)
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Message is in Reply To:
| | Re: A better full adder!
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| (...) AND takes 1 piston + 1 switch using your design. XOR takes 1 piston + 2 switches using my design. OR takes 1 piston + 2 switches using my design. But AND and XOR can be done using the same piston, so 1 piston + 3 switches gets you a half (...) (21 years ago, 26-Jun-03, to lugnet.technic, lugnet.robotics)
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