unsigned long sonMillis = 0;
const long aralik = 2000; // 2 saniye

void setup() {
  Serial.begin(9600);
}

void loop() {
  unsigned long currentMillis = millis();
  
  if (currentMillis - sonMillis >= aralik) {
    sonMillis = currentMillis;
    Serial.println("2 saniye geçti");
  }
}