Subject:
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Re: Pneumatic switching circuits
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Newsgroups:
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lugnet.technic
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Date:
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Sat, 29 Jan 2005 06:08:12 GMT
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Viewed:
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3119 times
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In lugnet.technic, Kevin L. Clague wrote:
> In lugnet.technic, Joseph Greene wrote:
> > <SNIP>
<SNIP>
> We never use either switches' outputs O2, so we have to plug them (think short
> hose segment and light sabre blade).
I was wondering what the mthod of choice for this was...
>
> \ \
> +--\----+ +--\----+
> |O1 O2| |O1 O2|
> | I | | | I |
> +-----|-+ +---A---+
> A | B |
> +-----------+
>
> The above diagram gives you pressure out O2 when both pistons are contracted.
>
> So the above gives you the ability to synchronize when the two legs in pair 1
> are both lifted or dropped. You can use the exact same thing for pair 2.
>
> The other leg movement (horizontal) can happen on all four legs at a time. You
> can use the technique above only with four pistons and eight switches to tell
> when all the legs have swept to either extreme.
>
> Now for the sequence.....
>
> When pair 1 is up, you want to sweep the legs.
>
> When all the legs have swept, lower pair 1.
>
> When pair 1 is down, raise pair 2.
>
> When pair 2 is up, sweep the legs.
>
> When all the legs had swept, lower pair 2.
>
> When pair 2 is down, raise pair 1.
>
>
> And the cycle repeats.
>
> So...... the "pair 1 up" can be used to pressurize the legs to sweep one
> direction.
>
> The "legs swept the first direction" output can be used to pressurize pair 1 to
> lower its legs.
>
> The "pair 1 down" output can be used to force pair 2 up.
>
> The "pair 2 up" output can be used to pressurize the legs sweep the opposite
> direction.
>
> The "legs swept opposite direction" output can be used to force pair 2 down.
>
> The "pair 2 down" output can be used to force pair 1 up.....
>
> Does this help?
>
> Kevin
That helps a lot.. looks like I'm gonna need to find around 30 more switches...
Best source I found Technic Wreckers has a bunch.. but I fear shipping from
Australia will be pricey......and Lego S@H only has a very limited supply of
'spares'...
I may have to resort to the old fashioned studded kind.. at least those I can
order from Lego Education.. but they're gonna take up so much more construction
space....Ah well...
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Message is in Reply To:
 | | Re: Pneumatic switching circuits
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| (...) I thought that might be what it was. (...) It all started when JP Brown (famous for his Rubik Cube Solver out of LEGO), made the bold statement that you could not do boolean logic using LEGO pneumatics, because of the switches. Inutitively I (...) (20 years ago, 28-Jan-05, to lugnet.technic)
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