const int LED=9;          // Define LED for pin 9
void setup()
{
 pinMode (LED, OUTPUT);   // Set the LED pin as an output
}

void loop()
{
for (int i=100; i<=1000; i=i+100)
{
  digitalWrite(LED, HIGH);
  delay(i);
  digitalWrite(LED, LOW);
  delay(i);
 }
}