// Example 06B: Set the brightness of LED to
// a brightness specified by the 
// value of the analogue input
//
// Copy and paste this example into an empty Arduino sketch

#define LED  9  // the pin for the LED 

int val = 0;    // variable used to store the value
                // coming from the sensor

void setup() {

  pinMode(LED, OUTPUT); // LED is as an OUTPUT

  // Note: Analogue pins are
  // automatically set as inputs
}

void loop() {

  val = analogRead(0); // read the value from
                       // the sensor
  analogWrite(LED, val/4); // turn the LED on at
                           // the brightness set
                           // by the sensor
 
  delay(10); // stop the program for
             // some time
}