void setup() {
  // put your setup code here, to run once:
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  analogWrite(9, 255);
  delay (500);
  digitalWrite(9, LOW);
  analogWrite(10, 255);
  delay (500);
  digitalWrite(10, LOW);
  analogWrite(11, 255);
  delay (500);
  digitalWrite(11, LOW);
}