int contador;
void setup() {
  Serial.begin(9600);
  pinMode(2, INPUT);

  // put your setup code here, to run once:

}

void loop() {
   
   
   unsigned long currentMillis = millis();
   long previousMillis;
   long intervalo=100;
 // Verificar si ha pasado 100 milesimas
   if (currentMillis - previousMillis >= intervalo) {
   previousMillis = currentMillis;
   CadaMillis();
  } 
 

 Serial.println(String(digitalRead(2)));
 delay(1000);
}

 void CadaMillis() {
    int estadoInterruptor = digitalRead(2);
    if (estadoInterruptor == LOW) {
    contador++;
    Serial.println("El interruptor fué presionado " + String(contador) + "veces.");
    }
 }