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In lugnet.technic, Mark Tarrabain wrote:
> Kevin L. Clague wrote:
> > If you have an algorithm for using the switches the way you do without running
> > into accidental release problems, I'd be very interested in how you do it.
>
> Not sure if there's an algorithm, per se... but here's how I do it.
>
> Conceptually, I think of the backwards switch arrangement as an XOR
> gate. Input (from the output valves) will only be accepted from either
> the top or bottom valve. In general, the way I avoid accidental release
> problems is by only hooking up bottom valves to bottom valves and top
> valves to top valves on switches on the same piston. Since all the
> switches are flipped in unison, any pressure that exists at either side
> will only propogate to the same side of switches elsewhere, and the
> output will come out the switch's normal entry valve.
>
> To do inter-piston switch configurations, as I do in the full adder, I
> exploited the fact that that positive pressure will never simultaneously
> exist in A XOR Cin and A&Cin, so if I used A XOR Cin to drive the left
> piston, I could safely run A&Cin through a lower valve on a switch
> connected to that piston.
>
> Does that make any sense?
Yes. Thanks. I'll have to try some of my own designs to really comprehend it.
I learn by doing (and failing ;^).
>
> > > Mark
Kevin
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Message is in Reply To:
 | | Re: A better full adder!
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| (...) Not sure if there's an algorithm, per se... but here's how I do it. Conceptually, I think of the backwards switch arrangement as an XOR gate. Input (from the output valves) will only be accepted from either the top or bottom valve. In general, (...) (21 years ago, 1-Jul-03, to lugnet.technic, lugnet.robotics)
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