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1. You already know how to connect an LED to the Arduino board.
2. This time, you need to connect the LED the same way but into different output number that supports PWM( what is this ) output
   In other word, with "~" by the side of the number of PIN.

3. Let's connect the LED to pin 9 as refer to : http://arduino.cc/en/Tutorial/Fade

   iFrame
   src http://arduino.cc/en/Tutorial/Fade width 960 id fadearduion height 600

4. src

   Anchor
   pwmdescription pwmdescription

    PWM is "Pulse-width modulation", please refer to : http://arduino.cc/en/Tutorial/PWM
   iFrame

   http://arduino.cc/en/Tutorial/PWM

   width960idpotheight600