\nHe identifies the problem with needing springs, but doesn’t have a fix. Mentions how AND\/OR gates can be reversed to become OR\/AND gates.<\/td>\n<\/tr>\n
![Carolin Liebl and Lisa Hopf’s NAND Gate<\/a><\/td>\n](\"http:\/\/www.niklasroy.com\/images\/mrnand.gif\"){kind=link}
There are many more ideas out there, even water pipe logic<\/a>, and of course the early mechanical computers Digi-Comp I<\/a> and Digi-Comp II<\/a>.<\/p>\n For my project, I have the following requirements;<\/p>\n This disqualifies most of the designs I found, particularly the ‘no springs’ requirement.<\/p>\n Mechalogic’s AND gate design uses an elastic band, but doesn’t appear to need it, so it serves as a good starting point:<\/p>\n It’s time consuming to tweak parameters in the physical world, so I wrote a small simulation: (click to see in action)<\/p>\n Success! Meets all the requirements, and only needs three parts.<\/p>\n The geometry is important – the ratio will determine the output’s position when only one of the inputs is asserted, according to;<\/p>\n Now, can an OR gate be designed with the same success?<\/p>\n Most OR gates look like this; the output (on the left of this picture) has a flat plate, and either input will push the flat forward. Unfortunately the design needs that elastic band to return the output to zero. Inspired by some earlier attempts to couple an AND and a backwards OR gate together, I tried flipping the AND gate around; (click to see in action)<\/p>\n Success! Oddly enough, an OR gate is just an AND gate connected up backwards<\/strong>. As the graphs show, output displacement equals input displacement, so these designs should be chainable. Let’s have a look; (click to see in action)<\/p>\n Success!<\/p>\n Now I just have to build something complex with them…<\/p>\n All the simulations are viewable here<\/a>. Logic gates! The building blocks of computing as we know it. What if we ditch the electrons? I want some mechanical logic for an upcoming project, so I did some research… Research There are several examples of mechanical logic out … Continue reading \n
AND Gate<\/h1>\n
![\"Mechalogic](\"https:\/\/mindbleach.com\/words\/wp-content\/uploads\/2014\/10\/mech-logic-21.png\")
<\/a><\/p>\n![\"2-Input](\"https:\/\/mindbleach.com\/words\/wp-content\/uploads\/2014\/10\/and.png\")
<\/a><\/p>\n\n
OR Gate<\/h1>\n
![\"photo-jan-26-2-57-46-pm[1]\"](\"https:\/\/mindbleach.com\/words\/wp-content\/uploads\/2014\/10\/photo-jan-26-2-57-46-pm1-1024x764.jpg\")
<\/a><\/p>\n![\"2-Input](\"https:\/\/mindbleach.com\/words\/wp-content\/uploads\/2014\/10\/or.png\")
<\/a><\/p>\n
\nEven the linkage lengths are the same!
\nBest of all, the OR gate is reversible like the AND gate – no springs and no force required.<\/p>\nAND Then?<\/h1>\n
![\"3-Input](\"https:\/\/mindbleach.com\/words\/wp-content\/uploads\/2014\/10\/and3.png\")
<\/a><\/p>\n![\"3-Input](\"https:\/\/mindbleach.com\/words\/wp-content\/uploads\/2014\/10\/or3.png\")
<\/a><\/p>\n
\n
\nThe code they’re written with is available on GitHub;
\nhttps:\/\/github.com\/MrTrick\/logic_gates<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"