Alternative (and incompatible) layout for USB connectors
+ +1 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: svjatoslav@svjatoslav.eu + +
+
+ - Valeria Agejenko + +
+
+ - Svjatoslav Agejenko
+
- See also: + + +
2 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. +
+ + + +
+
+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 printed, laminated warning stickers. +
+ +
+Alternative wiring schematic:
+
+
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+
- 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: +
+ + +
+