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+<title>Alternative (and incompatible) layout for USB connectors</title>
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+<meta name="author" content="Svjatoslav Agejenko">
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+<div id="content" class="container">
+<div class="row"><div class="col-md-9"><h1 class="title">Alternative (and incompatible) layout for USB connectors</h1>
+
+<div id="outline-container-sec-1" class="outline-2">
+<h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
+COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
+DESIGNS AT YOUR OWN RISK.
+</li>
+
+<li>This design is released under Creative Commons Zero (CC0) license.
+</li>
+
+<li>Authors:
+<ul class="org-ul">
+<li>Svjatoslav Agejenko
+<ul class="org-ul">
+<li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
+</li>
+<li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+
+<li>Valeria Agejenko
+</li>
+</ul>
+</li>
+
+<li>See also:
+<ul class="org-ul">
+<li><a href="../../index.html">Other physical projects in this repository</a>
+</li>
+<li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+
+<div id="outline-container-sec-2" class="outline-2">
+<h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+<b>Warning!</b> Here I describe a hack that I personally found useful for
+my own needs. But it is dangerous. Not to be replicated unless you
+know that you are doing.
+</p>
+
+
+
+<figure>
+<p><img src="make.png" class="img-responsive" alt="make.png">
+</p>
+</figure>
+
+<p>
+I needed a way to power various devices I build.
+</p>
+
+<p>
+Requirements:
+</p>
+
+<ul class="org-ul">
+<li>Reliable.
+</li>
+<li>Cheap.
+</li>
+<li>Easy to use.
+</li>
+<li>Popular and highly available.
+</li>
+<li>Ability to draw significant current directly from 12V cheap, popular
+and powerful lead-acid battery (optionally off-grid). Useful for
+powerful electric motors, heaters, soldering irons, radio
+transmitters, etc.
+</li>
+<li>Ability to draw limited but stabilized 5V power. Good for digital
+circuits.
+</li>
+<li>Ability to have limited and simple 1-wire digital communication.
+</li>
+</ul>
+
+<p>
+USB Type A connectors are best match that I found.
+</p>
+
+<p>
+The main problem is, I like USB connectors but I want to use different
+and incompatible electrical layout with them.
+</p>
+
+<p>
+<b>Connecting proper USB power supplies, devices and even cables to the
+ones that use alternative electrical layout would do damage!!!</b>
+</p>
+
+<p>
+To avoid accidental mismatches, I mark all connectors/cables and devices that
+use alternative wiring with <a href="stickers.png">printed, laminated warning stickers</a>.
+</p>
+
+<p>
+Alternative wiring schematic:
+<img src="schematic.png" class="img-responsive" alt="schematic.png">
+</p>
+
+<ul class="org-ul">
+<li>Outer shell is ground.
+</li>
+<li>2 central pins are re-purposed to deliver +12V and high power.
+</li>
+<li>1 pin is for limited power +5V.
+</li>
+<li>1 pin for 1-Wire data.
+</li>
+</ul>
+
+
+<p>
+Example warning marking on device to indicate that alternative USB
+layout is used here:
+</p>
+
+
+<figure>
+<p><img src="../lab%20heater%20and%20cooler/make,%202.png" class="img-responsive" alt="make,%202.png">
+</p>
+</figure>
+</div>
+</div>
+</div><div class="col-md-3"><nav id="table-of-contents">
+<div id="text-table-of-contents" class="bs-docs-sidebar">
+<ul class="nav">
+<li><a href="#sec-1">1. General</a></li>
+<li><a href="#sec-2">2. Project description</a></li>
+</ul>
+</div>
+</nav>
+</div></div></div>
+<footer id="postamble" class="">
+<div><p class="author">Author: Svjatoslav Agejenko</p>
+<p class="date">Created: 2021-01-03 P 00:30</p>
+<p class="creator"><a href="http://www.gnu.org/software/emacs/">Emacs</a> 26.1 (<a href="http://orgmode.org">Org-mode</a> 9.1.9)</p>
+</div>
+</footer>
+</body>
+</html>
projects / physical.git / commitdiff
