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Subject: 
Simulating pneumatic sequencers, was Re: Pneumatic Quadraped 242
Newsgroups: 
lugnet.technic, lugnet.robotics
Date: 
Wed, 26 Nov 2003 14:08:11 GMT
Viewed: 
309 times
  

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)

Cheers,

Philo
www.philohome.com



Message has 3 Replies:
  Re: Simulating pneumatic sequencers, was Re: Pneumatic Quadraped 242
 
(...) Philo, Hey! Great stuff! I've been aware of the electrical equivalence, but not mentioned it. Maybe if you put capacitors in series at the inputs of each flop, your test points might have less vertical slope. I'll probably use the simulator to (...) (21 years ago, 26-Nov-03, to lugnet.technic, lugnet.robotics)
  Re: Simulating pneumatic sequencers, was Re: Pneumatic Quadraped 242
 
(...) Philo, Have you seen this? (URL) amazingly like your SR flop schematics. Kevin (...) (21 years ago, 26-Nov-03, to lugnet.technic, lugnet.robotics)
  Re: Simulating pneumatic sequencers, was Re: Pneumatic Quadraped 242
 
(...) 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 (...) (21 years ago, 28-Nov-03, to lugnet.technic, lugnet.robotics)

Message is in Reply To:
  Re: Pneumatic Quadraped 242
 
I got a new web site with plenty of room, so I've uploaded Quad242 movies. The website is (URL) As usual, my creations are listed in chronological order, so Quad242 ((URL) is at the end of the creation list. There are movies for walking forward and (...) (21 years ago, 24-Nov-03, to lugnet.technic, lugnet.build, lugnet.robotics)  

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