HOW TO FIND OUT WHICH WIRE HAS POWER IN a USB CABLE

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Introduction: HOW TO FIND OUT WHICH WIRE HAS POWER IN a USB CABLE

About: English is not my first language. I use Google Translator and patience of friends to write Instructables. Feel free to point out style, syntax or grammatical errors. Actually I work in TECHSHOP Menlo Park C...

I checked it out @ Techshop

Quick answer: RED and BLACK

Step 1: First, You Will Need to Find an Used USB Cable, a Multimeter and a X-acto Blade.

(You can't see but the red and black wires are already peeled, may be someone tried before me to extract power from this cable)

Step 2: Then You Need to Peel the Wires


Step 3: Connect Your USB Cable to a Computer


Step 4: With the Multimeter Start to Hunt for Which Pair of Wires Measures Around 5V.


Step 5: It Is ... the BLACK and RED Pair


Step 6: Now Go Find a USB Female Port


Step 7: Cannibalize the Circuit


Step 8: Take Out the Plug

Fit the female plug into your power source

(the USB cable has 4 wires, and in this case the 2 outside wires were the power ones)

Step 9: Weld and Isolate Everything Together


Step 10: And Done :) This Was Done at Techshop

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    3 Comments

    what we can do with the remaining wire the white and the blue wire

    1 reply

    That are DATA+ and DATA- wire... Simply nothing. Only if you know what are you doing.

    Good idea! Thank you for the information.