int led = 2;

void setup() {  //declaringGPIO2asanOUTPUTpin.
  pinMode(2, OUTPUT);
}

void loop() {
  
  /*strobelighteffect,*/
  // suchontheaeroplane.
  digitalWrite(led, 0);
  delay(1000);
  digitalWrite(led, 1);
  delay(1000);
  digitalWrite(2, LOW);
  delay(1000);
  digitalWrite(2, HIGH);
  delay(1000);
}