USB powered LED/ Christmas lights

This shows how to power an LED or some Christmas lights from the USB port on your computer.

Step 1 Get your materials

For this you will need the following:

Old USB cable with a male end (like an extender that you can buy at the dollar store)
An LED
OR
An old set of battery operated Christmas lights (also a dollar store product)

Comments

[NaesDraw]

Cool. I have one of these battery powered things. 4 AA? I think not. And this way, it will only be on when I'm sitting there. Thanks for the info.

[supersith22]

Glad you like it! Honestly, I forgot I had this 'Ible. =P

[rickdf]

Love the idea and effort but have to agree with Itsgoofytime. You really should add a resistor as they are cheap and easy. Just put one in the circuit and the led will last forever. Here's the formula. Good luck! //rick//

R = (VS - VL) / I

VS = supply voltage
VL = LED voltage (usually 2V, but 4V for blue and white LEDs)
I = LED current (e.g. 20mA), this must be less than the maximum permitted

[Jontebullen]

hey i followed your instructable (very nice btw) but my LED only blinks four times and then nothing. At first it was on more and the device manager thingy popped on and off installing it and stuff ( i run win xp ) but after a few reconnects it does nothing :( any ideas?

[sk83rjosh]

it could also be that hes over powering the light maybe thats it it did it to me before i connected a resisitor but eventually the led will burn out sad but true i use my green led as a backlight to my xbox 360 lol works fine

[supersith22]

hmm, did you do anything with the green and white wires? if so, disconnect them they are for data transfer. Also check to be sure that you have no crossed wires, that would mess up the circuit. thank you for the compliment and I hope that this helped.

[pdub77]

check out my first instructable that i posted over two years ago: usb Christmas lights.

you might also check out the link i provided showing where i got the idea from.

looks like we started at the same place. hope to see more from you.

[hoihoi151]

Add Resistor. Add Resistor Add Resistor. Add Resistor Add Resistor. Add Resistor

[webman3802]

I just did this for a small tree on my desk at work. I used a 10-light battery powered string from the dollar store and a spare usb cable. Works great!

[agent9_11]

does it have to be battery operated ones or can you use regular ones?

[supersith22]

The battery ones operate on 3 volts of power and you get 5 volts out of the usb port. I've not tried it with regular ones but i think that they require more power

[Itsgoofytime]

This is all wrong. USB puts out 5VDC, with a max of 500mA, which is close to blowing out the port. You need a resistor on the LED so it wont burn out, which is apparent in your LED picture. The LED appears to be yellow indicating a burning LED die. It should be green, as indicated by the green colored lens. Revise.

[supersith22]

my bad, the Picture was bad and the LED wasn't burnt out, the Christmas light was the main part, I just had an LED lying around