#define btnPin 2

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(btnPin, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(2), buttonPress, FALLING);
}

void buttonPress() {
  static unsigned long lastInterrupt = 0;
  if (millis() > lastInterrupt + 100) {
    // Gjør det du skal her
    Serial.println("Button pressed!");
    lastInterrupt = millis();
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  
}