Ensure your ESP8266 board is connected to your computer via the USB cable. No other components will be used in this exercise, since there are no inputs or outputs that are required.

We will include the ESP8266 library in the program and set the Wi-Fi network ssid and password so that the ESP8266 connects to the network when it gets powered on. We will print out a confirmation and the IP address of the ESP8266 when the connection is successful.

This is the sketch for this exercise:

// Libraries
#include <ESP8266WiFi.h>

// WiFi network
const char* ssid     = "your-ssid";
const char* password = "your-password";

void setup() {
  
  // Start serial
  Serial.begin(115200);
  delay(10);

  // Connecting to a WiFi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");  
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void loop() {
  
}

Refer the following steps:

The results are as shown in the following screenshot. The ESP8266 prints its IP address once the connection has been successfully established:

The program sets up the Wi-Fi SSID and password using the WiFi.begin() function of the ESP8266Wifi library, and then executes the WiFi.status() function to try to connect to the Wi-Fi network. The program checks whether the WiFi.status() function returns a true value to indicate that the ESP8266 board has successfully connected to the Wi-Fi network. If the connection was not successful, the sketch tries to connect again using the WiFi.status() function and repeats that until the WiFi.status() function returns a true value to indicate that the ESP8266 has successfully connected to the Wi-Fi network.

When the ESP8266 connects to the Wi-Fi network, the sketch displays a message, WiFi connected, and the IP address of the ESP8266 on the serial monitor.

You can enter the wrong password and SSID and see what output you get in the serial monitor.

Now that you have successfully connected your ESP8266 board to your local Wi-Fi network, you can proceed to the next recipe, where we will be connecting the ESP8266 board to the Internet.