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1. Please refer to : http://www.arduino.cc/en/Tutorial/Potentiometer 

   iFrame
   src http://www.arduino.cc/en/Tutorial/Potentiometer width 960 id potentiometer height 600

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2. The original programme will blink the led using the input as speed of blinking, It's also possible to adjust the LED intensity using the input.

   Code Block

   int potPin = 0; // select the input pin for the potentiometer int ledPin = 9; // select the pin for the LED (need to be any pin you connected and need to have a "~") int val = 0; // variable to store the value coming from the sensor void setup() { pinMode(ledPin, OUTPUT); // declare the ledPin as an OUTPUT } void loop() { val = analogRead(potPin); // read the value from the sensor analogWrite(ledPin, val >> 2); // because the read value is 0 -> 1023, the output range is 0 -> 255,  // >> 2 basically is a faster way of dividing by 4 }