int MOTOR=3;
int i;
byte velocidad = 1;
int pausa = 12000;

void setup(){
  pinMode(MOTOR, OUTPUT);
  //Serial.begin(115200);
  analogWrite(MOTOR, 0);  
}

void loop(){
    /*
    for(i=150; i<=255; i++){
      analogWrite(MOTOR, i);
      //Serial.print(" "+String(i));
      delay(velocidad);
    }
    //Serial.println("");
    delay(pausa);
    for(i=255; i>=150; i--){
      analogWrite(MOTOR, i);
      //Serial.print(" "+String(i));
      delay(velocidad);
    }
    //Serial.println("");
    */
    analogWrite(MOTOR, 215);
    delay(pausa);
    analogWrite(MOTOR, 0);
    delay(5000);
    analogWrite(MOTOR, 235);
    delay(pausa);
    analogWrite(MOTOR, 0);
    delay(5000);
    analogWrite(MOTOR, 255);
    delay(pausa);
    /*
    analogWrite(MOTOR, 255);
    delay(pausa);
    analogWrite(MOTOR, 0);
    delay(velocidad);
    */
}