AP Simple Web Server WiFi

In this example, a simple web server lets you blink an LED via the web. This example uses the beginAP() function to set up an access point without relying on a local WiFI network. This example will print the IP address of your WiFi module to the Arduino Software (IDE) serial monitor. Once you know the IP address of our board, you can open that address in a web browser to turn on and off the LED on pin 9.

If the IP address of your shield is yourAddress: http://yourAddress/H turns the LED on http://yourAddress/L turns it off

AP WebServer

Hardware Required


Connect an LED with a resistor between PIN 9 and ground of your board.

MKR WiFi 1010 Arduino MKR WiFi 1010

Vidor Arduino MKR VIDOR 4000

UNO wifi Arduino UNO WiFi Rev.2

Please note: these three boards use dedicated pins to communicate and select the WiFi module, therefore you have no restriction in the usage of the available digital pins connected to the header pins.


The default address of the board in AP mode is When you load this sketch, the WiFi module creates an Access Point with the name specified as SSID in arduino_secrets.h. Connect to it using the password specified as PASS.


  WiFi Web Server LED Blink

  A simple web server that lets you blink an LED via the web.

  This sketch will create a new access point (with no password).

  It will then launch a new server and print out the IP address

  to the Serial monitor. From there, you can open that address in a web browser

  to turn on and off the LED on pin 13.

  If the IP address of your board is yourAddress:

    http://yourAddress/H turns the LED on

    http://yourAddress/L turns it off

  created 25 Nov 2012

  by Tom Igoe

  adapted to WiFi AP by Adafruit


#include <SPI.h>
#include <WiFiNINA.h>
#include "arduino_secrets.h"
///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID;        // your network SSID (name)
char pass[] = SECRET_PASS;    // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0;                // your network key Index number (needed only for WEP)

int led =  LED_BUILTIN;
int status = WL_IDLE_STATUS;

WiFiServer server(80);

void setup() {

  //Initialize serial and wait for port to open:


  while (!Serial) {

    ; // wait for serial port to connect. Needed for native USB port only


  Serial.println("Access Point Web Server");

  pinMode(led, OUTPUT);      // set the LED pin mode

  // check for the WiFi module:

  if (WiFi.status() == WL_NO_MODULE) {

    Serial.println("Communication with WiFi module failed!");

    // don't continue

    while (true);


  String fv = WiFi.firmwareVersion();


    Serial.println("Please upgrade the firmware");


  // by default the local IP address of will be

  // you can override it with the following:

  // WiFi.config(IPAddress(10, 0, 0, 1));

  // print the network name (SSID);

  Serial.print("Creating access point named: ");


  // Create open network. Change this line if you want to create an WEP network:

  status = WiFi.beginAP(ssid, pass);

  if (status != WL_AP_LISTENING) {

    Serial.println("Creating access point failed");

    // don't continue

    while (true);


  // wait 10 seconds for connection:


  // start the web server on port 80


  // you're connected now, so print out the status


void loop() {

  // compare the previous status to the current status

  if (status != WiFi.status()) {

    // it has changed update the variable

    status = WiFi.status();

    if (status == WL_AP_CONNECTED) {

      // a device has connected to the AP

      Serial.println("Device connected to AP");

    } else {

      // a device has disconnected from the AP, and we are back in listening mode

      Serial.println("Device disconnected from AP");



  WiFiClient client = server.available();   // listen for incoming clients

  if (client) {                             // if you get a client,

    Serial.println("new client");           // print a message out the serial port

    String currentLine = "";                // make a String to hold incoming data from the client

    while (client.connected()) {            // loop while the client's connected

      if (client.available()) {             // if there's bytes to read from the client,

        char c = client.read();             // read a byte, then

        Serial.write(c);                    // print it out the serial monitor

        if (c == '\n') {                    // if the byte is a newline character

          // if the current line is blank, you got two newline characters in a row.

          // that's the end of the client HTTP request, so send a response:

          if (currentLine.length() == 0) {

            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)

            // and a content-type so the client knows what's coming, then a blank line:

            client.println("HTTP/1.1 200 OK");



            // the content of the HTTP response follows the header:

            client.print("Click <a href=\"/H\">here</a> turn the LED on<br>");

            client.print("Click <a href=\"/L\">here</a> turn the LED off<br>");

            // The HTTP response ends with another blank line:


            // break out of the while loop:



          else {      // if you got a newline, then clear currentLine:

            currentLine = "";



        else if (c != '\r') {    // if you got anything else but a carriage return character,

          currentLine += c;      // add it to the end of the currentLine


        // Check to see if the client request was "GET /H" or "GET /L":

        if (currentLine.endsWith("GET /H")) {

          digitalWrite(led, HIGH);               // GET /H turns the LED on


        if (currentLine.endsWith("GET /L")) {

          digitalWrite(led, LOW);                // GET /L turns the LED off




    // close the connection:


    Serial.println("client disconnected");


void printWiFiStatus() {

  // print the SSID of the network you're attached to:

  Serial.print("SSID: ");


  // print your WiFi shield's IP address:

  IPAddress ip = WiFi.localIP();

  Serial.print("IP Address: ");


  // print where to go in a browser:

  Serial.print("To see this page in action, open a browser to http://");



See Also:

Last revision 2018/07/12 by SM