Instructables

Step 7: Lucky Number Seven

That seventh port shouldn't go unused. With a USB extension cable, or any other spare USB cable, make some eyes.

Snip the cable to get to the tasty red and black wires inside. Solder a resistor to a couple of LEDs and HEY!, we have some lights.
 
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SpinneNetz7 years ago
I have managed to completely fail at doing this step. I have some 5mm, 1.8 volt, 20mA leds I thought would work, but no go. Are these not going to work? Also, is it led (+) to resistor to red wire, or led (-) to resistor to red wire? I have almost no experience with this sort of thing.
fungus amungus (author)  SpinneNetz7 years ago
Fail often! That just means you're learning.

Anyway, check out this step for more info. The whole instructable is helpful if you have the time.

Your first idea of + to resistor to red should work.
Buaha, after several trips to Fry's I got it right! Thanks for the help, this is a great project.
fungus amungus (author)  SpinneNetz7 years ago
No problem. Be sure to post a picture of the results!
NickIQ7 years ago
Just out of curiosity, what voltage/amperage are your LEDs and what resister do you have there in front of them? How much light do they provide (I don't need to know the exact candle measurement of brightness or anything, just curious.) Thank you, I love this project, I'm working on something similar, definitely inspired by the cool work you've done here.
fungus amungus (author)  NickIQ7 years ago
Don't remember the exact info offhand, but I think it was a voltage drop of 2V each and they're wired in parallel with a 100 ohm resistor. It's a little dimmer than possible, but I wanted more of a glow anyway.

Check out this site for resistor help.