#+TITLE: Alternative (and incompatible) layout for USB connectors
#+author: Svjatoslav Agejenko
#+LANGUAGE: en
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* General
+ 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.
+ This design is released under Creative Commons Zero (CC0) license.
+ Authors:
- Svjatoslav Agejenko
- Homepage: https://svjatoslav.eu
- Email: [[mailto://svjatoslav@svjatoslav.eu][svjatoslav@svjatoslav.eu]]
- Valeria Agejenko
+ See also:
- [[../../index.html][Other physical projects in this repository]]
- [[https://www.svjatoslav.eu/projects/][Other projects hosted at svjatoslav.eu]]
* Project description
*Warning!* 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.
[[file:make.png]]
I needed a way to power various devices I build.
Requirements:
- Reliable.
- Cheap.
- Easy to use.
- Popular and highly available.
- 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.
- Ability to draw limited but stabilized 5V power. Good for digital
circuits.
- Ability to have limited and simple 1-wire digital communication.
USB Type A connectors are best match that I found.
The main problem is, I like USB connectors but I want to use different
and incompatible electrical layout with them.
*Connecting proper USB power supplies, devices and even cables to the
ones that use alternative electrical layout would do damage!!!*
To avoid accidental mismatches, I mark all connectors/cables and devices that
use alternative wiring with [[file:stickers.png][printed, laminated warning stickers]].
Alternative wiring schematic:
[[file:schematic.png]]
- Outer shell is ground.
- 2 central pins are re-purposed to deliver +12V and high power.
- 1 pin is for limited power +5V.
- 1 pin for 1-Wire data.
Example warning marking on device to indicate that alternative USB
layout is used here:
[[file:../lab%20heater%20and%20cooler/make,%202.png]]