#include <WiFi.h>

const char* ssid     = "your_SSID";
const char* password = "your_PASSWORD";

int ledPins[] = {27, 26, 12, 13, 14, 15, 2, 4, 5, 18};
int numOfLEDs = sizeof(ledPins) / sizeof(ledPins[0]);

void setup() {
  Serial.begin(115200);
  for (int i = 0; i < numOfLEDs; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
  WiFi.begin(ssid, password);
}

void loop() {
  if (WiFi.status() == WL_CONNECTED) {
    for (int i = 0; i < numOfLEDs; i++) {
      digitalWrite(ledPins[i], LOW);
    }
    Serial.println("WiFi Connected");
  } else {
    int i;
    for (i = 0; i < numOfLEDs; i++) {
      digitalWrite(ledPins[i], HIGH);
      delay(500);
      digitalWrite(ledPins[i], LOW);
    }
    for (i = numOfLEDs - 2; i >= 0; i--) {
      digitalWrite(ledPins[i], HIGH);
      delay(500);
      digitalWrite(ledPins[i], LOW);
    }
    Serial.println("WiFi Connecting...");
  }
}