Subject:
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Boolean logic using LEGO Pneumatics
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Newsgroups:
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lugnet.technic
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Date:
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Sun, 1 Jun 2003 10:51:48 GMT
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I"ve been putting together stuff for my pneumatic presentation at BrickFest.
How unlike me to be preparing so far ahead.
I put together two kinds of pneumatic gates, AND and OR.
These gates are minor redesigns of the ones used in PneumADDic II, described in
detail in our latest book Mindstorms Masterpieces by Doug Carlson, Mario and
Giulio Ferrari, Miguel Agullo, Hideaki Yabukiand myself.
Here is the AND gate in its four input states:
0 AND 0 = 0
http://www.brickshelf.com/gallery/kclague/Computing/p5280032.jpg
1 AND 0 = 0
http://www.brickshelf.com/gallery/kclague/Computing/p5280033.jpg
0 AND 1 = 0
http://www.brickshelf.com/gallery/kclague/Computing/p5280034.jpg
1 AND 1 = 1
http://www.brickshelf.com/gallery/kclague/Computing/p5280035.jpg
Here is the OR gate in its four input states:
0 OR 0 = 0
http://www.brickshelf.com/gallery/kclague/Computing/p5280036.jpg
1 OR 0 = 1
http://www.brickshelf.com/gallery/kclague/Computing/p5280037.jpg
0 OR 1 = 1
http://www.brickshelf.com/gallery/kclague/Computing/p5280038.jpg
1 OR 1 = 1
http://www.brickshelf.com/gallery/kclague/Computing/p5280039.jpg
In both AND and OR gates, rubber bands are used to connect the pistons to the
switch. In the case of the AND gate, the band is streched in the 0,0 state. In
the case of the OR gate, the band is stretched in the 1,1 state.
The simplest of all boolean logic gates is the NOT gate, where you put in a zero
and get out a 1, and visa versa. A NOT function can be implemented simply by
reversing the connections at a given pneumatic piston.
Enjoy!
Kevin
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