volatile uint32_t count = 5000; // Holds the count of interrupts

void incrementCount() {
  count++;
}

void setup() {
  Serial.begin(115200);
  pinMode(2, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(2), incrementCount, RISING);
}

void loop() {
  Serial.print("Interrupt count: ");
  
  noInterrupts();   // Critical Section: Disable interrupts while reading
  Serial.println(count);
  interrupts();     // Re-enable interrupts
  
  delay(100);
}