//global
int frec (int n, int o){
  return(440*exp(((o-4)+((n-10.0)/12))*log(2)));//frecuencia notas musicales
}
int x=0; 
void setup(){//local
Serial.begin(9600);//velocidad
   pinMode(4, INPUT_PULLUP);//push arriba
   pinMode(7, OUTPUT);//salida
   pinMode(9,OUTPUT);//salida bocina

}
//global
boolean d=0;
void loop(){
  
   d=digitalRead(4);
   if(d==0)
   { 
    while(digitalRead(4)==0);
    digitalWrite(9,HIGH);x++;
    tone(9,frec(1,5));delay(500);noTone(9);
    tone(9,frec(3,5));delay(500);noTone(9);
    tone(9,frec(5,5));delay(500);noTone(9);
   }
   else {
    digitalWrite(7,LOW); noTone(9);
    }
    Serial.println(x);

}