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Picture of How to make 5 volt
These LEDs can be made with any LED that needs less than 5 volts to operate and they are really useful when you want to add an LED to a project and don't have a protoboard or want the LED to be right on the Arduinoo.

Step 1: WHat you`ll need

for this project you will need;

  - Any LED that needs less than 5 Volts.
  - The correct resistor for that LED. You can easily calculate it here.
 

Yes thanks for the link to the LED Resistor Calculator. It has proven to be a real time saver for me. Good work!

Instructable was worth it for that web page alone for educational purposes. Not fond of advertisements.
Screenshot-LED Resistor Calculator - Mozilla Firefox-1.pngScreenshot-LED Resistor Calculator - Mozilla Firefox-2.png