void setup()
{
  Serial.begin(115200);

  pinMode(2, OUTPUT); // LED1
  pinMode(3, OUTPUT); // LED2
  pinMode(4, OUTPUT); // LED3
  pinMode(5, OUTPUT); // LED4
  pinMode(6, OUTPUT); // LED5
  pinMode(7, OUTPUT); // LED6

  // Initial delay before output is visible
  Serial.println("Waiting before starting LEDs...");
  delay(3000); // 3 seconds delay
}

void loop()
{
  // Step 1: LED1 & LED6
  digitalWrite(D8, HIGH);
  digitalWrite(D13, HIGH);
  Serial.println("LED1 & LED6 ON");
  delay(3000);

  digitalWrite(D8, LOW);
  digitalWrite(D13, LOW);
  delay(3000);

  // Step 2: LED2 & LED4
  digitalWrite(D9, HIGH);
  digitalWrite(D11, HIGH);
  Serial.println("LED2 & LED4 ON");
  delay(3000);

  digitalWrite(D9, LOW);
  digitalWrite(D11, LOW);
  delay(3000);

  // Step 3: LED3 & LED5
  digitalWrite(D10, HIGH);
  digitalWrite(D12, HIGH);
  Serial.println("LED3 & LED5 ON");
  delay(3000);

  digitalWrite(D10, LOW);
  digitalWrite(D12, LOW);
  delay(3000);
}