Arduino - Web Server Multiple Pages

In this tutorial, we'll find out how to turn an Arduino into a web server that can handle multiple pages at the same time, such as index.html, temperature.html, led.html, error_404.html, and error_405.html... Each page's content, including HTML, CSS, and JavaScript, will be stored in different files on the Arduino IDE. By accessing the Arduino Web Server from a web browser on your PC or smartphone, you will be able to view and control sensors and actuators connected to the Arduino through the web. Additionally, the web server will be designed to accept links with or without the .html extension.

Arduino web browser

By following this tutorial, you will be able to turn your Arduino into a web server with some cool features:

It might sound complicated, but don't worry! This tutorial provides step-by-step guidance, and the code is designed to be beginner-friendly, ensuring that you can easily comprehend and create your own Arduino web server.

Hardware Required

1×Arduino UNO R4 WiFi
1×USB Cable Type-C
1×(Optional) 9V Power Adapter for Arduino
1×(Recommended) Screw Terminal Block Shield for Arduino Uno
1×(Optional) Transparent Acrylic Enclosure For Arduino Uno

Or you can buy the following sensor kit:

1×DIYables Sensor Kit 30 types, 69 units
Please note: These are Amazon affiliate links. If you buy the components through these links, We will get a commission at no extra cost to you. We appreciate it.

About Arduino Uno R4 and Web Server

If you're not familiar with Arduino Uno R4 and Web Server (including pinout, how it works, and programming), you can learn about them through the following tutorials:

How a web server on Arduino works

When a web browser sends an HTTP request to the Arduino board, the Arduino needs to be programmed to perform the following tasks:

  • Create a web server that can listen for HTTP requests from the web browser.
  • Read the first line of the HTTP request header when it receives an HTTP request.
  • Route the requests based on the first line of the HTTP request to determine which web pages the Arduino should return.
  • (Optionally) Analyze the HTTP request header to identify control commands sent by the user.
  • (Optionally) Control the devices connected to the Arduino based on the received control commands.
  • Send an HTTP response back to the web browser, which includes:
    • An HTTP response header.
    • The HTTP response body, which contains HTML content and (if applicable) sensor data or device state.

    By performing these tasks, the Arduino can effectively handle HTTP requests and provide appropriate responses to the web browser, allowing for web-based control and interaction with the Arduino's connected devices.

    The routing function is the most important task, and it will be explained in detail. Other parts are covered in the Arduino - Web Server tutorial. Once you understand the routing algorithm, we will proceed to see the complete code for a web server with multiple pages.

Arduino Web Server - Routing Algorithm

Before writing code for the routing function, you should create a list of web pages and corresponding HTTP methods that will be available on Arduino. In this tutorial, we will only support the GET method. However, you can easily extend it to include other HTTP methods if needed. Here is an example list:

  • GET home page
  • GET temperature page
  • GET door page
  • GET led page

After that, you need to create a list of the first-line HTTP request headers corresponding to the page list:

  • GET home page:
    • GET /
    • GET /index.html
  • GET temperature page
    • GET /temperature.html
  • GET door page
    • GET /door
  • GET led page
    • GET /led.html

    In summary, we have the following list:

    GET / GET /index.html GET /temperature.html GET /door.html GET /led.html

    The following code demonstrates how to implement the routing function for a web server on Arduino.

    if (HTTP_req.indexOf("GET") == 0) { // check if request method is GET if (HTTP_req.indexOf("GET / ") > -1 || HTTP_req.indexOf("GET /index.html ") > -1) { Serial.println("home page"); // TO BE IMPLEMENT } else if (HTTP_req.indexOf("GET /temperature.html ") > -1) { Serial.println("temperature page"); // TO BE IMPLEMENT } else if (HTTP_req.indexOf("GET /door.html ") > -1) { Serial.println("door page"); // TO BE IMPLEMENT } else if (HTTP_req.indexOf("GET /led.html ") > -1) { Serial.println("led page"); // TO BE IMPLEMENT } else { // 404 Not Found Serial.println("404 Not Found"); // TO BE IMPLEMENT } } else { // 405 Method Not Allowed Serial.println("405 Method Not Allowed"); // TO BE IMPLEMENT }

    Feel free to modify the code to add or remove pages as needed. Now, let's update the routing function to handle links with or without the .html extension.

    if (HTTP_req.indexOf("GET") == 0) { // check if request method is GET if (HTTP_req.indexOf("GET / ") > -1 || HTTP_req.indexOf("GET /index ") > -1 || HTTP_req.indexOf("GET /index.html ") > -1) { Serial.println("home page"); // TO BE IMPLEMENT } else if (HTTP_req.indexOf("GET /temperature ") > -1 || HTTP_req.indexOf("GET /temperature.html ") > -1) { Serial.println("temperature page"); // TO BE IMPLEMENT } else if (HTTP_req.indexOf("GET /door ") > -1 || HTTP_req.indexOf("GET /door.html ") > -1) { Serial.println("door page"); // TO BE IMPLEMENT } else if (HTTP_req.indexOf("GET /led ") > -1 || HTTP_req.indexOf("GET /led.html ") > -1) { Serial.println("led page"); // TO BE IMPLEMENT } else { // 404 Not Found Serial.println("404 Not Found"); // TO BE IMPLEMENT } } else { // 405 Method Not Allowed Serial.println("405 Method Not Allowed"); // TO BE IMPLEMENT }

Arduino Code - Multiple-page Web server

Below is the complete Arduino code that creates a web server with multiple pages. To keep it simple, the HTML content for each page is very simple and embedded directly in the Arduino code. In the next part, we will learn how to separate the HTML contents for each page into separate files, making the code more organized and manageable.

/* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-web-server-multiple-pages */ #include <WiFiS3.h> #define PAGE_HOME 0 #define PAGE_TEMPERATURE 1 #define PAGE_DOOR 2 #define PAGE_LED 3 #define PAGE_ERROR_404 -1 #define PAGE_ERROR_405 -2 const char ssid[] = "YOUR_WIFI"; // change your network SSID (name) const char pass[] = "YOUR_WIFI_PASSWORD"; // change your network password (use for WPA, or use as key for WEP) int status = WL_IDLE_STATUS; WiFiServer server(80); void setup() { //Initialize serial and wait for port to open: Serial.begin(9600); String fv = WiFi.firmwareVersion(); if (fv < WIFI_FIRMWARE_LATEST_VERSION) Serial.println("Please upgrade the firmware"); // attempt to connect to WiFi network: while (status != WL_CONNECTED) { Serial.print("Attempting to connect to SSID: "); Serial.println(ssid); // Connect to WPA/WPA2 network. Change this line if using open or WEP network: status = WiFi.begin(ssid, pass); // wait 10 seconds for connection: delay(10000); } server.begin(); // you're connected now, so print out the status: printWifiStatus(); } void loop() { // listen for incoming clients WiFiClient client = server.available(); if (client) { // read the first line of HTTP request header String HTTP_req = ""; while (client.connected()) { if (client.available()) { Serial.println("New HTTP Request"); HTTP_req = client.readStringUntil('\n'); // read the first line of HTTP request Serial.print("<< "); Serial.println(HTTP_req); // print HTTP request to Serial Monitor break; } } // read the remaining lines of HTTP request header while (client.connected()) { if (client.available()) { String HTTP_header = client.readStringUntil('\n'); // read the header line of HTTP request if (HTTP_header.equals("\r")) // the end of HTTP request break; //Serial.print("<< "); //Serial.println(HTTP_header); // print HTTP request to Serial Monitor } } // ROUTING // This example supports the following: // - GET / // - GET /index // - GET /index.html // - GET /temperature // - GET /temperature.html // - GET /door // - GET /door.html // - GET /led // - GET /led.html int page_id = 0; if (HTTP_req.indexOf("GET") == 0) { // check if request method is GET if (HTTP_req.indexOf("GET / ") > -1 || HTTP_req.indexOf("GET /index ") > -1 || HTTP_req.indexOf("GET /index.html ") > -1) { Serial.println("home page"); page_id = PAGE_HOME; } else if (HTTP_req.indexOf("GET /temperature ") > -1 || HTTP_req.indexOf("GET /temperature.html ") > -1) { Serial.println("temperature page"); page_id = PAGE_TEMPERATURE; } else if (HTTP_req.indexOf("GET /door ") > -1 || HTTP_req.indexOf("GET /door.html ") > -1) { Serial.println("door page"); page_id = PAGE_DOOR; } else if (HTTP_req.indexOf("GET /led ") > -1 || HTTP_req.indexOf("GET /led.html ") > -1) { Serial.println("led page"); page_id = PAGE_LED; } else { // 404 Not Found Serial.println("404 Not Found"); page_id = PAGE_ERROR_404; } } else { // 405 Method Not Allowed Serial.println("405 Method Not Allowed"); page_id = PAGE_ERROR_405; } // send the HTTP response // send the HTTP response header if (page_id == PAGE_ERROR_404) client.println("HTTP/1.1 404 Not Found"); if (page_id == PAGE_ERROR_405) client.println("HTTP/1.1 405 Method Not Allowed"); else client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println("Connection: close"); // the connection will be closed after completion of the response client.println(); // the separator between HTTP header and body // send the simple HTTP response body client.println("<!DOCTYPE HTML>"); client.println("<html>"); client.println("<head>"); client.println("<link rel=\"icon\" href=\"data:,\">"); client.println("</head>"); String html; switch (page_id) { case PAGE_HOME: client.println("This is home page"); break; case PAGE_TEMPERATURE: client.println("This is temperature page"); break; case PAGE_DOOR: client.println("This is door page"); break; case PAGE_LED: client.println("This is LED page"); break; case PAGE_ERROR_404: client.println("Page Not Found"); break; case PAGE_ERROR_405: client.println("Method Not Allowed"); break; } client.println("</html>"); client.flush(); client.flush(); // give the web browser time to receive the data delay(10); // close the connection: client.stop(); } } void printWifiStatus() { // print your board's IP address: Serial.print("IP Address: "); Serial.println(WiFi.localIP()); // print the received signal strength: Serial.print("signal strength (RSSI):"); Serial.print(WiFi.RSSI()); Serial.println(" dBm"); }

Quick Steps

  • If this is the first time you use Arduino Uno R4, see how to setup environment for Arduino Uno R4 on Arduino IDE.
  • Copy the above code and open with Arduino IDE
  • Change the wifi information (SSID and password) in the code to yours
  • Click Upload button on Arduino IDE to upload code to Arduino
  • Open the Serial Monitor
  • Check out the result on Serial Monitor.
COM6
Send
Attempting to connect to SSID: YOUR_WIFI IP Address: 192.168.0.2 signal strength (RSSI):-39 dBm
Autoscroll Show timestamp
Clear output
9600 baud  
Newline  
  • You will see an IP address on the Serial Monitor, for example: 192.168.0.2
  • Type the following list one-by-one on the address bar of a web browser on your smartphone or PC.
192.168.0.2 192.168.0.2/index 192.168.0.2/index.html 192.168.0.2/led 192.168.0.2/led.html 192.168.0.2/door 192.168.0.2/door.html 192.168.0.2/temperature 192.168.0.2/temperature.html 192.168.0.2/blabla 192.168.0.2/blabla.html
  • Please note that you need to change the 192.168.0.2 to the IP address you got on Serial Monitor.
  • You will see the following pages: home page, led page, door page, temperature page, and Not Found page
  • You can also check the output on Serial Monitor

The previous code has very simple HTML content for each page. But if we want to make a fancy interface with lots of HTML, the code can get big and messy. To make it simpler, we will learn how to separate the HTML from the Arduino code. This lets us keep the HTML in separate files, making it easier to manage and work with.

Arduino Code - Complete multiple-page Web server

  • Open the Arduino IDE.
  • Create a new sketch and give it a name, for example, ArduinoWebServer.ino.
  • Copy the provided code and paste it into that file.
/* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-web-server-multiple-pages */ #include <WiFiS3.h> #include "index.h" #include "temperature.h" #include "door.h" #include "led.h" #include "error_404.h" #include "error_405.h" #define PAGE_HOME 0 #define PAGE_TEMPERATURE 1 #define PAGE_DOOR 2 #define PAGE_LED 3 #define PAGE_ERROR_404 -1 #define PAGE_ERROR_405 -2 const char ssid[] = "YOUR_WIFI"; // change your network SSID (name) const char pass[] = "YOUR_WIFI_PASSWORD"; // change your network password (use for WPA, or use as key for WEP) int status = WL_IDLE_STATUS; WiFiServer server(80); float getTemperature() { // YOUR SENSOR IMPLEMENTATION HERE // simulate the temperature value float temp_x100 = random(0, 10000); // a ramdom value from 0 to 10000 return temp_x100 / 100; // return the simulated temperature value from 0 to 100 in float } void setup() { //Initialize serial and wait for port to open: Serial.begin(9600); String fv = WiFi.firmwareVersion(); if (fv < WIFI_FIRMWARE_LATEST_VERSION) Serial.println("Please upgrade the firmware"); // attempt to connect to WiFi network: while (status != WL_CONNECTED) { Serial.print("Attempting to connect to SSID: "); Serial.println(ssid); // Connect to WPA/WPA2 network. Change this line if using open or WEP network: status = WiFi.begin(ssid, pass); // wait 10 seconds for connection: delay(10000); } server.begin(); // you're connected now, so print out the status: printWifiStatus(); } void loop() { // listen for incoming clients WiFiClient client = server.available(); if (client) { // read the first line of HTTP request header String HTTP_req = ""; while (client.connected()) { if (client.available()) { Serial.println("New HTTP Request"); HTTP_req = client.readStringUntil('\n'); // read the first line of HTTP request Serial.print("<< "); Serial.println(HTTP_req); // print HTTP request to Serial Monitor break; } } // read the remaining lines of HTTP request header while (client.connected()) { if (client.available()) { String HTTP_header = client.readStringUntil('\n'); // read the header line of HTTP request if (HTTP_header.equals("\r")) // the end of HTTP request break; //Serial.print("<< "); //Serial.println(HTTP_header); // print HTTP request to Serial Monitor } } // ROUTING // This example supports the following: // - GET / // - GET /index // - GET /index.html // - GET /temperature // - GET /temperature.html // - GET /door // - GET /door.html // - GET /led // - GET /led.html int page_id = 0; if (HTTP_req.indexOf("GET") == 0) { // check if request method is GET if (HTTP_req.indexOf("GET / ") > -1 || HTTP_req.indexOf("GET /index ") > -1 || HTTP_req.indexOf("GET /index.html ") > -1) { Serial.println("home page"); page_id = PAGE_HOME; } else if (HTTP_req.indexOf("GET /temperature ") > -1 || HTTP_req.indexOf("GET /temperature.html ") > -1) { Serial.println("temperature page"); page_id = PAGE_TEMPERATURE; } else if (HTTP_req.indexOf("GET /door ") > -1 || HTTP_req.indexOf("GET /door.html ") > -1) { Serial.println("door page"); page_id = PAGE_DOOR; } else if (HTTP_req.indexOf("GET /led ") > -1 || HTTP_req.indexOf("GET /led.html ") > -1) { Serial.println("led page"); page_id = PAGE_LED; } else { // 404 Not Found Serial.println("404 Not Found"); page_id = PAGE_ERROR_404; } } else { // 405 Method Not Allowed Serial.println("405 Method Not Allowed"); page_id = PAGE_ERROR_405; } // send the HTTP response // send the HTTP response header if (page_id == PAGE_ERROR_404) client.println("HTTP/1.1 404 Not Found"); if (page_id == PAGE_ERROR_405) client.println("HTTP/1.1 405 Method Not Allowed"); else client.println("HTTP/1.1 200 OK"); client.println("Content-Type: text/html"); client.println("Connection: close"); // the connection will be closed after completion of the response client.println(); // the separator between HTTP header and body // send the HTTP response body String html; switch (page_id) { case PAGE_HOME: html = String(HTML_CONTENT_HOME); break; case PAGE_TEMPERATURE: html = String(HTML_CONTENT_TEMPERATURE); html.replace("TEMPERATURE_MARKER", String(getTemperature(), 2)); // replace the marker by a real value break; case PAGE_DOOR: html = String(HTML_CONTENT_DOOR); html.replace("DOOR_STATE_MARKER", "OPENED"); // replace the marker by a real value break; case PAGE_LED: html = String(HTML_CONTENT_LED); html.replace("LED_STATE_MARKER", "OFF"); // replace the marker by a real value break; case PAGE_ERROR_404: html = String(HTML_CONTENT_404); break; case PAGE_ERROR_405: html = String(HTML_CONTENT_405); break; } client.println(html); client.flush(); // give the web browser time to receive the data delay(10); // close the connection: client.stop(); } } void printWifiStatus() { // print your board's IP address: Serial.print("IP Address: "); Serial.println(WiFi.localIP()); // print the received signal strength: Serial.print("signal strength (RSSI):"); Serial.print(WiFi.RSSI()); Serial.println(" dBm"); }
  • Change the WiFi information (SSID and password) in the code to yours
  • Create the index.h file On Arduino IDE by:
    • Either click on the button just below the serial monitor icon and choose New Tab, or use Ctrl+Shift+N keys.
    Arduino IDE 2 adds file
    • Give file's name index.h and click OK button
    Arduino IDE 2 adds file index.h
    • Copy the below code and paste it to the index.h file.
    /* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-web-server-multiple-pages */ const char *HTML_CONTENT_HOME = R""""( <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link rel="icon" href="data:,"> <title>Home Page</title> </head> <body> <h1>Welcome to the Home Page</h1> <ul> <li><a href="/led">LED Page</a></li> <li><a href="/temperature">Temperature Page</a></li> <li><a href="/door">Door Page</a></li> </ul> </body> </html> )"""";
    • Similarly, Create the temperature.h file On Arduino IDE with the following content.
    /* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-web-server-multiple-pages */ const char *HTML_CONTENT_TEMPERATURE = R""""( <!DOCTYPE html> <html> <head> <title>Arduino - Web Temperature</title> <meta name="viewport" content="width=device-width, initial-scale=0.7, maximum-scale=0.7"> <meta charset="utf-8"> <link rel="icon" href="https://diyables.io/images/page/diyables.svg"> <style> body { font-family: "Georgia"; text-align: center; font-size: width/2pt;} h1 { font-weight: bold; font-size: width/2pt;} h2 { font-weight: bold; font-size: width/2pt;} button { font-weight: bold; font-size: width/2pt;} </style> <script> var cvs_width = 200, cvs_height = 450; function init() { var canvas = document.getElementById("cvs"); canvas.width = cvs_width; canvas.height = cvs_height + 50; var ctx = canvas.getContext("2d"); ctx.translate(cvs_width/2, cvs_height - 80); update_view(TEMPERATURE_MARKER); } function update_view(temp) { var canvas = document.getElementById("cvs"); var ctx = canvas.getContext("2d"); var radius = 70; var offset = 5; var width = 45; var height = 330; ctx.clearRect(-cvs_width/2, -350, cvs_width, cvs_height); ctx.strokeStyle="blue"; ctx.fillStyle="blue"; //5-step Degree var x = -width/2; ctx.lineWidth=2; for (var i = 0; i <= 100; i+=5) { var y = -(height - radius)*i/100 - radius - 5; ctx.beginPath(); ctx.lineTo(x, y); ctx.lineTo(x - 20, y); ctx.stroke(); } //20-step Degree ctx.lineWidth=5; for (var i = 0; i <= 100; i+=20) { var y = -(height - radius)*i/100 - radius - 5; ctx.beginPath(); ctx.lineTo(x, y); ctx.lineTo(x - 25, y); ctx.stroke(); ctx.font="20px Georgia"; ctx.textBaseline="middle"; ctx.textAlign="right"; ctx.fillText(i.toString(), x - 35, y); } // shape ctx.lineWidth=16; ctx.beginPath(); ctx.arc(0, 0, radius, 0, 2 * Math.PI); ctx.stroke(); ctx.beginPath(); ctx.rect(-width/2, -height, width, height); ctx.stroke(); ctx.beginPath(); ctx.arc(0, -height, width/2, 0, 2 * Math.PI); ctx.stroke(); ctx.fillStyle="#e6e6ff"; ctx.beginPath(); ctx.arc(0, 0, radius, 0, 2 * Math.PI); ctx.fill(); ctx.beginPath(); ctx.rect(-width/2, -height, width, height); ctx.fill(); ctx.beginPath(); ctx.arc(0, -height, width/2, 0, 2 * Math.PI); ctx.fill(); ctx.fillStyle="#ff1a1a"; ctx.beginPath(); ctx.arc(0, 0, radius - offset, 0, 2 * Math.PI); ctx.fill(); temp = Math.round(temp * 100) / 100; var y = (height - radius)*temp/100.0 + radius + 5; ctx.beginPath(); ctx.rect(-width/2 + offset, -y, width - 2*offset, y); ctx.fill(); ctx.fillStyle="red"; ctx.font="bold 34px Georgia"; ctx.textBaseline="middle"; ctx.textAlign="center"; ctx.fillText(temp.toString() + "°C", 0, 100); } window.onload = init; </script> </head> <body> <h1>Arduino - Web Temperature</h1> <canvas id="cvs"></canvas> </body> </html> )"""";
    • Similarly, Create the door.h file On Arduino IDE with the following content.
    /* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-web-server-multiple-pages */ const char *HTML_CONTENT_DOOR = R""""( <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link rel="icon" href="data:,"> <title>Door Page</title> </head> <body> <h1>Door Page</h1> <p>Door State: <span style="color: red;">DOOR_STATE_MARKER</span></p> </body> </html> )"""";
    • Similarly, Create the led.h file On Arduino IDE with the following content.
    /* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-web-server-multiple-pages */ const char *HTML_CONTENT_LED = R""""( <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link rel="icon" href="data:,"> <title>LED Page</title> </head> <body> <h1>LED Page</h1> <p>LED State: <span style="color: red;">LED_STATE_MARKER</span></p> </body> </html> )"""";
    • Similarly, Create the error_404.h file On Arduino IDE with the following content.
    /* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-web-server-multiple-pages */ const char *HTML_CONTENT_404 = R""""( <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link rel="icon" href="data:,"> <title>404 - Page Not Found</title> <style> h1 {color: #ff4040;} </style> </head> <body> <h1>404</h1> <p>Oops! The page you are looking for could not be found on Arduino Web Server.</p> <p>Please check the URL or go back to the <a href="/">homepage</a>.</p> <p>Or check <a href="https://arduinogetstarted.com/tutorials/arduino-web-server-multiple-pages"> Arduino Web Server</a> tutorial.</p> </body> </html> )"""";
    • Similarly, Create the error_405.h file On Arduino IDE with the following content.
    /* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-web-server-multiple-pages */ const char *HTML_CONTENT_405 = R""""( <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link rel="icon" href="data:,"> <title>405 - Method Not Allowed</title> <style> h1 {color: #ff4040;} </style> </head> <body> <h1>405 - Method Not Allowed</h1> <p>Oops! The requested method is not allowed for this resource.</p> <p>Please check your request or go back to the <a href="/">homepage</a>.</p> <p>Or check <a href="https://arduinogetstarted.com/tutorials/arduino-web-server-multiple-pages"> Arduino Web Server</a> tutorial.</p> </body> </html> )"""";
    • Now you have multiple files on Arduino IDE like below:
    Arduino IDE 2 multiple files
    • Click Upload button on Arduino IDE to upload code to Arduino
    • Access the web pages of Arduino board via web browser one by one as before. You will see all web page as below:
    Arduino multiple web page

    ※ NOTE THAT:

    • If you make changes to the HTML content within the index.h file but don't modify anything in the ArduinoWebServer.ino file, the Arduino IDE won't refresh or update the HTML content when you compile and upload the code to the ESP32.
    • To force the Arduino IDE to update the HTML content in this situation, you need to make a modification in the ArduinoWebServer.ino file. For example, you can add an empty line or insert a comment. This action triggers the IDE to recognize that there have been changes in the project, ensuring that your updated HTML content gets included in the upload.

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