---

int n=0;

void setup(){
  pinMode(2,INPUT_PULLUP);
  pinMode(9,OUTPUT);
}

void loop(){
  if(!digitalRead(2)){
    while(!digitalRead(2));
    n++;

    if(n==3){
      for(int b=0;b<=255;b++){
        analogWrite(9,b);
        delay(10);
      }
    }

    if(n==4){
      analogWrite(9,0);
      n=0;
    }
  }
}