const int taster = 2;
volatile int fallingEdge = 0;


unsigned long outputTime = 750;
unsigned long now = 0;
unsigned long lastTime = 0;

unsigned long nowISR = 0;
unsigned long lastTimeISR = 0;
unsigned long debounceTime = 50;
void setup() {
  pinMode(taster, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(taster), count, FALLING);
  Serial.begin(9600);
}

void loop() {
  now = millis();
  if (now - lastTime >= outputTime) {
    Serial.print("Fallende Flanken: ");
    Serial.println(fallingEdge);
    lastTime = now;
}
  }
  

void count() {
  nowISR = millis();
  if(nowISR - lastTimeISR >= debounceTime){
    fallingEdge = fallingEdge + 1;
    lastTimeISR = nowISR;
  }
  
  
}