void setup() {
  Serial.begin (1152000);
  pinMode(3,OUTPUT);
}

void loop() {
  int n = Serial.available();
  if(n>0)


     { char C = Serial.read();
      if(C= "0")
      analogWrite (3,0);

       if(C= "1")
      analogWrite (3,60);

       if(C= "2")
      analogWrite (3,130);

       if(C= "0")
      analogWrite (3,255);
     }

}