int contador;
void funInterrupt(){
 contador++;
}


void setup() {
  // put your setup code here, to run once:
 pinMode(2, INPUT);
 attachInterrupt(digitalPinToInterrupt(2),funInterrupt,RISING);
 Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
 //digitalRead(contador);
 Serial.println(contador);
 delay(100);
}