void setup(){
  pinMode(9,OUTPUT);
}
void loop(){
  analogWrite(9,64);
  delay(1000);
   analogWrite(9,127);
  delay(1000);
   analogWrite(9,19);
  delay(1000);
   analogWrite(9,255);
  delay(1000);
   analogWrite(9,0);
  delay(1000);

}