looking for help.. sata power: single LED

[Joey2Sites]

I know almost nothing about electrical wiring.  But my idea is to put a 5mm led above my IO shield in the rear of my new case (phanteks enthoo pro) like nzxt has been doing on some of their cases.  I think the io light is a cool idea.

 

A white led I found is 3.2 volts, 20mA.

 

Sata power has a 3.3 wire.  

 

Can I run just the 3.3v and ground to the led with an on/off switch?  I guess I would need a 5 ohm resistor, which I found on radioshack.com.  

 

Here's a really terrible drawing I made to demonstrate.  Can anyone let me know if I'm on the right track?

 

[Speedyv]

You can use an online calculator to find the needed resistance with it rounding to the closest standard resistor:

http://led.linear1.org/1led.wiz

[Joey2Sites]

You can use an online calculator to find the needed resistance with it rounding to the closest standard resistor:

http://led.linear1.org/1led.wiz

 

Ok, it says I need a 5 ohm resistor.  I found 10 ohm resistors, which should be fine.  But do I need to wire it a certain way..  does the switch need to go on the ground wire? or both?  

[Bittenfleax]

Ok, it says I need a 5 ohm resistor.  I found 10 ohm resistors, which should be fine.  But do I need to wire it a certain way..  does the switch need to go on the ground wire? or both?  

Nope, you can just have it on the Positive wire. He is an example:

 

You will not need a fuse unless you really want to put one in. It will only protect the LED's/Resistor from breaking if there is a huge power surge, but the PSU sorts that out so you will not need one.