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

void loop() {
  // put your main code here, to run repeatedly:
for (int i=0;i<=250;i++)
  {
    analogWrite(11,i);
    delay(20);
    }
for(int i=250;i>0;i--)
  {
  analogWrite(11,i);
  delay(5);
  }
  for (int i=0;i<=250;i++)
  {
    analogWrite(9,i);
    delay(10);
    }
for(int i=250;i>0;i--)
  {
  analogWrite(9,i);
  delay(5);
  }
  for (int i=0;i<=250;i++)
  {
    analogWrite(10,i);
    delay(15);
    }
for(int i=250;i>0;i--)
  {
  analogWrite(10,i);
  delay(10);
  }
}