int conta = 0;
void setup ()
{
   Serial. begin (9600) ;
   pinMode (2, INPUT);
   pinMode (13, OUTPUT);
   }
void loop()
{
if ( digitalRead (2) == LOW )
{
if ( digitalRead (2) == HIGH)
{
conta++;
Serial. println(conta);
delay (100);
}
}
if (conta==5)
{
digitalWrite (13, HIGH);
}
if (conta==8)
{
digitalWrite (13, LOW) ;
conta=0;
}
}