4 <title>Alternative (and incompatible) layout for USB connectors</title>
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198 <div class="row"><div class="col-md-9"><h1 class="title">Alternative (and incompatible) layout for USB connectors</h1>
200 <div id="outline-container-sec-1" class="outline-2">
201 <h2 id="sec-1"><span class="section-number-2">1</span> General</h2>
202 <div class="outline-text-2" id="text-1">
204 <li>DISCLAIMER: I DO ELECTRONICS AND 3D DESIGN SOLELY AS A HOBBY. THERE
205 COULD BE ERRORS THAT CAN RESULT IN ALL KINDS OF DAMAGE. USE THESE
206 DESIGNS AT YOUR OWN RISK.
209 <li>This design is released under Creative Commons Zero (CC0) license.
214 <li>Svjatoslav Agejenko
216 <li>Homepage: <a href="https://svjatoslav.eu">https://svjatoslav.eu</a>
218 <li>Email: <a href="mailto://svjatoslav@svjatoslav.eu">svjatoslav@svjatoslav.eu</a>
230 <li><a href="../../index.html">Other physical projects in this repository</a>
232 <li><a href="https://www.svjatoslav.eu/projects/">Other projects hosted at svjatoslav.eu</a>
240 <div id="outline-container-sec-2" class="outline-2">
241 <h2 id="sec-2"><span class="section-number-2">2</span> Project description</h2>
242 <div class="outline-text-2" id="text-2">
244 <b>Warning!</b> Here I describe a hack that I personally found useful for
245 my own needs. But it is dangerous. Not to be replicated unless you
246 know that you are doing.
252 <p><img src="make.png" class="img-responsive" alt="make.png">
257 I needed a way to power various devices I build.
271 <li>Popular and highly available.
273 <li>Ability to draw significant current directly from 12V cheap, popular
274 and powerful lead-acid battery (optionally off-grid). Useful for
275 powerful electric motors, heaters, soldering irons, radio
278 <li>Ability to draw limited but stabilized 5V power. Good for digital
281 <li>Ability to have limited and simple 1-wire digital communication.
286 USB Type A connectors are best match that I found.
290 The main problem is, I like USB connectors but I want to use different
291 and incompatible electrical layout with them.
295 <b>Connecting proper USB power supplies, devices and even cables to the
296 ones that use alternative electrical layout would do damage!!!</b>
300 To avoid accidental mismatches, I mark all connectors/cables and devices that
301 use alternative wiring with <a href="stickers.png">printed, laminated warning stickers</a>.
305 Alternative wiring schematic:
306 <img src="schematic.png" class="img-responsive" alt="schematic.png">
310 <li>Outer shell is ground.
312 <li>2 central pins are re-purposed to deliver +12V and high power.
314 <li>1 pin is for limited power +5V.
316 <li>1 pin for 1-Wire data.
322 Example warning marking on device to indicate that alternative USB
328 <p><img src="../lab%20heater%20and%20cooler/make,%202.png" class="img-responsive" alt="make,%202.png">
333 </div><div class="col-md-3"><nav id="table-of-contents">
334 <div id="text-table-of-contents" class="bs-docs-sidebar">
336 <li><a href="#sec-1">1. General</a></li>
337 <li><a href="#sec-2">2. Project description</a></li>
342 <footer id="postamble" class="">
343 <div><p class="author">Author: Svjatoslav Agejenko</p>
344 <p class="date">Created: 2021-01-03 P 00:30</p>
345 <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>