void setup() {
  // put your setup code here, to run once:
  pinMode(5,OUTPUT);
  }

void loop() {
  // put your main code here, to run repeatedly:
  analogWrite(5,0);
  delay(1000);
  analogWrite(5,64);
  delay(1000);
  analogWrite(5,127);
  delay(1000);
  analogWrite(5,191);
  delay(1000);
  analogWrite(5,255);
  delay(1000);
}