void setup() {
  pinMode(5, OUTPUT);  // Set GPIO 5 as output
}

void loop() {
  for (int i = 0; i < =5; i++) {
    digitalWrite(5, HIGH);  // Turn LED on
    delay(500);             // Wait 500ms
    digitalWrite(5, LOW);   // Turn LED off
    delay(500);             // Wait 500ms
  }
  delay(2000);  // Pause before repeating
}