Subject:
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Re: Simulating pneumatic sequencers, was Re: Pneumatic Quadraped 242
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Newsgroups:
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lugnet.technic, lugnet.robotics
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Date:
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Fri, 28 Nov 2003 17:55:39 GMT
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Viewed:
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2710 times
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In lugnet.technic, Philippe Hurbain wrote:
> >
> > I also spent a lot of time this week writing up a page about pneumatic
> > sequencers (http://www.kclague.net/Sequencer). It is not done, because I don't
> > have all the movies finished, but I thought I'd put it up for those who might be
> > interested.
>
> Hi Kevin and all,
>
> I wanted to experiment with your sequencers without fussing too much with time
> consuming building, so I used simulation...
>
> I used a free electronics simulator, CircuitMaker Student
> (http://www.microcode.com/downloads/student.htm). Piston + switch are equivalent
> to an RS flip-flop, and you can add tubing (wires...), AND gates and SCOPE
> displays. A good tutorial and help file are provided with the program.
>
> Here are two screen captures of two simulated sequencers from your paper:
> http://www.brickshelf.com/gallery/Philo/Misc/2pistons.gif
> http://www.brickshelf.com/gallery/Philo/Misc/3pistons4switches.gif
>
> Caveats:
> - this does not simulate mechanical loading or speed variations between pistons
> (perhaps adding delay line can simulate that - not tested)
> - it's much more fun to build real sequencers ;o)
Philo,
I downloaded the tools, and entered the base schematic for Quad242. Quad242
depends on some initial conditions where 4 of the 5 flops have a value of 1.
I've read the docs and not found a way to preset the flops.
Any ideas?
Your choice to model the pistons as SR flops is perfect. With SR's you can
set or reset but not set and reset. Pistons are exactly like that. Pressure at
both ports on the piston provides unpredictable results.
>
> Cheers,
> Philo
> www.philohome.com
Kevin
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