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| author | jaseg <git@jaseg.net> | 2018-05-19 14:43:28 +0200 |
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| committer | jaseg <git@jaseg.net> | 2018-05-19 14:43:47 +0200 |
| commit | 7bc656ca2a026d91a845dd4d8bfeb812021cdf4d (patch) | |
| tree | 4f1896fe65afc9079e766602184cf0126d29913a /docs/posts/zeus-hammer/index.html | |
| parent | 24ad9ee7a0a8095d56c330a39321f40dee020dcb (diff) | |
| download | blog-7bc656ca2a026d91a845dd4d8bfeb812021cdf4d.tar.gz blog-7bc656ca2a026d91a845dd4d8bfeb812021cdf4d.tar.bz2 blog-7bc656ca2a026d91a845dd4d8bfeb812021cdf4d.zip | |
Add multichannel LED driver post
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| -rw-r--r-- | docs/posts/zeus-hammer/index.html | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/docs/posts/zeus-hammer/index.html b/docs/posts/zeus-hammer/index.html deleted file mode 100644 index 4d3e872..0000000 --- a/docs/posts/zeus-hammer/index.html +++ /dev/null @@ -1,117 +0,0 @@ -<!DOCTYPE html> -<html lang="en-us"> - <head> - <meta charset="utf-8"> - <meta name="viewport" content="width=device-width, initial-scale=1"> - <title>Zeus Hammer | jaseg.net</title> - <link rel="stylesheet" href="/css/style.css" /> - <link rel="stylesheet" href="/css/fonts.css" /> - - <header> - - - <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/atom-one-light.min.css"> - <script src="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script> - <script>hljs.initHighlightingOnLoad();</script> - <nav> - <ul> - - - <li class="pull-left "> - <a href="https://jaseg.net/">/home/jaseg.net</a> - </li> - - - - - </ul> - </nav> -</header> - - </head> - - <body> - <br/> - -<div class="article-meta"> -<h1><span class="title">Zeus Hammer</span></h1> - -<h2 class="date">2018/05/03</h2> -<p class="terms"> - - - - - -</p> -</div> - - - -<main> -<div class="document"> - - -<p>In case you were having an inferiority complex because your friends' IBM Model M keyboards are so much louder than the -shitty rubber dome freebie you got with your pc... Here's the solution: Zeus Hammer, a simple typing cadence enhancer -for <a class="reference external" href="https://en.wikipedia.org/wiki/PS/2_port">PS/2</a> keyboards.</p> -<!-- FIXME: add demo video --> -<p>The connects to the keyboard's PS/2 clock line and briefly actuates a large solenoid on each key press. An interesting -fact about PS/2 is that the clock line is only active as long as either the host computer or the input device actually -want to send data. In case of a keyboard that's the case when a key is pressed or when the host changes the keyboard's -LED state, otherwise the clock line is silent. We ignore the LED activity for now as it's generally coupled to key -presses. By just triggering an NE555 configured as astable flipflop we can stretch each train of clock pulses to a -pulse a few tens of milliseconds long that is enough to actuate the solenoid.</p> -<img alt="/images/zeus_hammer_schematic.jpg" src="/images/zeus_hammer_schematic.jpg" /> -<p>Since PS/2 sends each key press and key release separately this circuit will pulse twice per keystroke. It would be -possible to ignore one of them but I figure the added noise just adds to the experience.</p> -<p>Built on a breadboard, the circuit looks like this.</p> -<img alt="/images/zeus_hammer_breadboard.jpg" src="/images/zeus_hammer_breadboard.jpg" /> -<p>The completed system looks like this.</p> -<!-- FIXME: add image of completed system --> -<p>Since my solenoid did not have a tensioning spring I used a rubber band and some vinyl tape to make an adjustable -tensioner. The small orange USB hub serves as an end-stop because I had nothing else of the right shape. The sound and -resonance of the thing can be adjusted to taste by moving the end stop, adjusting the tensioning rubber and tuning the -excitation duration using the potentiometer. My particular solenoid was a bit slow so I added some pieces of circuit -board as shims between the plunger and the case to limit the plunger's travel inside the solenoid core. Here is another -video of the thing in action in which I tune and de-tune the mechanical resonance using the potentiometer.</p> -<!-- FIXME: add video w/ tune/detune --> -</div> -</main> - - <footer> - -<script> -(function() { - function center_el(tagName) { - var tags = document.getElementsByTagName(tagName), i, tag; - for (i = 0; i < tags.length; i++) { - tag = tags[i]; - var parent = tag.parentElement; - - if (parent.childNodes.length === 1) { - - if (parent.nodeName === 'A') { - parent = parent.parentElement; - if (parent.childNodes.length != 1) continue; - } - if (parent.nodeName === 'P') parent.style.textAlign = 'center'; - } - } - } - var tagNames = ['img', 'embed', 'object']; - for (var i = 0; i < tagNames.length; i++) { - center_el(tagNames[i]); - } -})(); -</script> - - - <div id="license-info"> - ©2018 by Sebastian Götte. This work is licensed under - <a href="https://creativecommons.org/licenses/by-sa/4.0/">CC-BY-SA 4.0</a>. - </div> - </footer> - </body> -</html> - |