Super Easy USB Powered Halloween Jack O' Lantern

This Is a pretty quick project. If you desperately need an LED-lit, USB powered pumpkin, that is.

Step 1: Get the Stuff.

you need:
-USB cable, from piece-of-crap old mouse or somesuch.
-LEDs; orange, I should think.
-A resistor.
-Tools.
-Sass.
-Flair. (optional)

Now carve that B up, yo!

Step 2: Electricals.

'You need to know the voltage and current requirements of your LEDs.

In the case of most ordinary red or orange LEDs, that will be ~2 volts, and no more than 20mA.

those crazy newfangled blue and white LEDs will take 3 volts.

Your USB port can supply up to 5 volts at 500mA, so you're gonna need a resistor.

I used 2 orange LEDs in series. That means I am drawing 4 volts total with 20mA of current. Using ohms law (or one of those handy internet calculators.)
5v - 4v = 1v.

1v / 20ma = 50ohms

So that's what I used.

USB power comes over the black(-) and red(+) wires in the cable. the other two are data lines. Just cut them off.