DC with fan

const int PinMotor =3;

void setup () {
pinMode(PinMotor, OUTPUT);
Serial.begin (9600);

}

void loop() {

 for (int i=50; i <=255; i++)
 {
  analogWrite (PinMotor, i);
  delay(25);
 }
 delay (200);

for (int i=50; i >=0; i--)
 {
  analogWrite (PinMotor, i);
  delay(25);
 }
 delay (200);
}