void setup() {
  // put your setup code here, to run once:
pinMode(3,OUTPUT);
analogWrite(3,100);
delay(500);
analogWrite(3,80);
delay(500);
analogWrite(3,60);
delay(500);
analogWrite(3,40);
delay(500);
analogWrite(3,20);
delay(500);
analogWrite(3,0);


}

void loop() {
  // put your main code here, to run repeatedly:
analogWrite(3,100);
delay(500);
analogWrite(3,80);
delay(500);
analogWrite(3,60);
delay(500);
analogWrite(3,40);
delay(500);
analogWrite(3,20);
delay(500);
analogWrite(3,0);

}