Arduino Nano ESP32 - Web Server Multiple Pages
In this tutorial, we'll find out how to turn an Arduino Nano ESP32 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...
By following this tutorial, you will be able to turn your Arduino Nano ESP32 into a web server with some cool features:
- Multiple web pages are active simultaneously.
- The HTML content (including HTML, CSS, and Javascript) for each page is kept separately in its own file on the Arduino IDE.
- The HTML content can be dynamically updated with real-time values from sensors, making the web pages dynamic and responsive.
- The web server allows to control something connected to Arduino Nano ESP32 via web.
- The web server handles HTTP error codes such as 404 Not Found
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 Nano ESP32 web server.
Hardware Preparation
Or you can buy the following kits:
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
Disclosure: Some of the links provided in this section are Amazon affiliate links. We may receive a commission for any purchases made through these links at no additional cost to you.
Additionally, some of these links are for products from our own brand, DIYables .
Additionally, some of these links are for products from our own brand, DIYables .
Overview of Arduino Nano ESP32 and Web Server
If you're not familiar with Arduino Nano ESP32 and Web Server (including pinout, how it works, and programming), you can learn about them through the following tutorials:
Arduino Nano ESP32 Code - Multiple-page Web server
Below is the complete Arduino Nano ESP32 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 Nano ESP32 code. In the another part, we will learn how to separate the HTML contents for each page into separate files, making the code more organized and manageable.
/*
* This Arduino Nano ESP32 code was developed by newbiely.com
*
* This Arduino Nano ESP32 code is made available for public use without any restriction
*
* For comprehensive instructions and wiring diagrams, please visit:
* https://newbiely.com/tutorials/arduino-nano-esp32/arduino-nano-esp32-web-server-multiple-pages
*/
#include <DIYables_ESP32_WebServer.h>
#define LED_PIN D5 // The Arduino Nano ESP32 pin connected to LED
int LED_state = LOW;
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
}
// WiFi credentials
const char WIFI_SSID[] = "YOUR_WIFI_SSID";
const char WIFI_PASSWORD[] = "YOUR_WIFI_PASSWORD";
// Create web server instance
DIYables_ESP32_WebServer server;
// Page handlers
void handleHome(WiFiClient& client, const String& method, const String& request, const QueryParams& params, const String& jsonData) {
Serial.println("Arduino Nano ESP32 Web Server: home page");
server.sendResponse(client, "This is the ESP32 home page");
}
void handleTemperature(WiFiClient& client, const String& method, const String& request, const QueryParams& params, const String& jsonData) {
Serial.println("Arduino Nano ESP32 Web Server: temperature page");
float temperature = getTemperature();
String reponse = "Temperature: " + String(temperature);
server.sendResponse(client, reponse.c_str());
}
void handleLed(WiFiClient& client, const String& method, const String& request, const QueryParams& params, const String& jsonData) {
Serial.println("Arduino Nano ESP32 Web Server: LED page");
// Check for the 'state' parameter in the query string
String state = "";
for (int i = 0; i < params.count; i++) {
if (String(params.params[i].key) == "state") {
state = params.params[i].value;
if (state == "on") {
LED_state = HIGH;
} else if (state == "off") {
LED_state = LOW;
}
// control LED here
digitalWrite(LED_PIN, LED_state);
Serial.print(" => turning LED to ");
Serial.print(state);
Serial.println();
break;
}
}
String reponse = "LED state: " + String(LED_state);
server.sendResponse(client, reponse.c_str());
}
void handleNotFound(WiFiClient& client, const String& method, const String& request, const QueryParams& params, const String& jsonData) {
String response = "<!DOCTYPE html><html><head><meta charset=\"UTF-8\"><title>404 Not Found</title></head><body>";
response += "<h1>404 - Page Not Found</h1>";
response += "<p>Sorry, we couldn't find that page!</p>";
response += "<a href=\"/\">Return to Home</a></body></html>";
server.sendResponse(client, response.c_str());
}
void setup() {
Serial.begin(9600);
delay(1000);
pinMode(LED_PIN, OUTPUT);
Serial.println("ESP32 Web Server");
// Configure routes
server.addRoute("/", handleHome);
server.addRoute("/temperature.html", handleTemperature);
server.addRoute("/led.html", handleLed);
// Set custom 404 handler
server.setNotFoundHandler(handleNotFound);
// Start web server with WiFi connection
server.begin(WIFI_SSID, WIFI_PASSWORD);
}
void loop() {
server.handleClient();
}
Detailed Instructions
To get started with Arduino Nano ESP32, follow these steps:
- If you are new to Arduino Nano ESP32, refer to the tutorial on how to set up the environment for Arduino Nano ESP32 in the Arduino IDE.
- Connect the Arduino Nano ESP32 board to your computer using a USB cable.
- Launch the Arduino IDE on your computer.
- Select the Arduino Nano ESP32 board and its corresponding COM port.
- Open the Library Manager by clicking on the Library Manager icon on the left navigation bar of Arduino IDE.
- Search “DIYables ESP32 WebServer”, then find the DIYables ESP32 WebServer.
- Click Install button to install the Web Server library by DIYables.
- 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 Nano ESP32
- Open the Serial Monitor
- Check out the result on Serial Monitor.
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Nano ESP32' on 'COM15')
New Line
9600 baud
Connecting to WiFi...
Connected to WiFi
Arduino Nano ESP32 Web Server's IP address: 192.168.0.2
Arduino Nano ESP32 Web server started
- 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.html
192.168.0.2/led.html
192.168.0.2/led.html?state=on
192.168.0.2/led.html?state=off
192.168.0.2/temperature.html
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, temperature page, and Not Found page
- You can also check the output on Serial Monitor
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Nano ESP32' on 'COM15')
New Line
9600 baud
Connecting to WiFi...
Connected to WiFi
Arduino Nano ESP32 Web Server's IP address: 192.168.0.2
Arduino Nano ESP32 Web server started
Web Server: home page
Web Server: LED page
Web Server: LED page => turning LED to on
Web Server: LED page => turning LED to off
Web Server: temperature page
Web Server: Not Found
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 Nano ESP32 code. This lets us keep the HTML in separate files, making it easier to manage and work with.
Arduino Nano ESP32 Code - Complete multiple-page Web server
- Open the Arduino IDE.
- Create a new sketch and give it a name, for example, ESP32WebServer.ino.
- Copy the provided code and paste it into that file.
/*
* This Arduino Nano ESP32 code was developed by newbiely.com
*
* This Arduino Nano ESP32 code is made available for public use without any restriction
*
* For comprehensive instructions and wiring diagrams, please visit:
* https://newbiely.com/tutorials/arduino-nano-esp32/arduino-nano-esp32-web-server-multiple-pages
*/
#include <DIYables_ESP32_WebServer.h>
#include "index.h"
#include "temperature.h"
#include "led.h"
#include "error_404.h"
#define LED_PIN D5 // The Arduino Nano ESP32 pin connected to LED
int LED_state = LOW;
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
}
// WiFi credentials
const char WIFI_SSID[] = "YOUR_WIFI_SSID";
const char WIFI_PASSWORD[] = "YOUR_WIFI_PASSWORD";
// Create web server instance
DIYables_ESP32_WebServer server;
// Page handlers
void handleHome(WiFiClient& client, const String& method, const String& request, const QueryParams& params, const String& jsonData) {
Serial.println("Arduino Nano ESP32 Web Server: home page");
server.sendResponse(client, HTML_CONTENT_HOME);
}
void handleTemperature(WiFiClient& client, const String& method, const String& request, const QueryParams& params, const String& jsonData) {
Serial.println("Arduino Nano ESP32 Web Server: temperature page");
float temperature = getTemperature();
String html = HTML_CONTENT_TEMPERATURE; // Use the HTML content from the temperature.h file
html.replace("%TEMPERATURE_VALUE%", String(temperature)); // update the temperature value
server.sendResponse(client, html.c_str());
}
void handleLed(WiFiClient& client, const String& method, const String& request, const QueryParams& params, const String& jsonData) {
Serial.println("Arduino Nano ESP32 Web Server: LED page");
// Check for the 'state' parameter in the query string
String state = "";
for (int i = 0; i < params.count; i++) {
if (String(params.params[i].key) == "state") {
state = params.params[i].value;
if (state == "on") {
LED_state = HIGH;
} else if (state == "off") {
LED_state = LOW;
}
// control LED here
digitalWrite(LED_PIN, LED_state);
Serial.print(" => turning LED to ");
Serial.print(state);
Serial.println();
break;
}
}
String html = HTML_CONTENT_LED; // Use the HTML content from the led.h file
html.replace("%LED_STATE%", LED_state ? "ON" : "OFF"); // update the LED state
server.sendResponse(client, html.c_str());
}
void handleNotFound(WiFiClient& client, const String& method, const String& request, const QueryParams& params, const String& jsonData) {
// Handle 404 Not Found error
Serial.println("Arduino Nano ESP32 Web Server: Not Found");
// Use the HTML content from the error_404.h file
server.sendResponse(client, HTML_CONTENT_404);
}
void setup() {
Serial.begin(9600);
delay(1000);
pinMode(LED_PIN, OUTPUT);
Serial.println("Arduino Nano ESP32 Web Server");
// Configure routes
server.addRoute("/", handleHome);
server.addRoute("/temperature.html", handleTemperature);
server.addRoute("/led.html", handleLed);
// Set custom 404 handler
server.setNotFoundHandler(handleNotFound);
// Start web server with WiFi connection
server.begin(WIFI_SSID, WIFI_PASSWORD);
}
void loop() {
server.handleClient();
}
- 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.
- Give file's name index.h and click OK button
- Copy the below code and paste it to the index.h file.
- Similarly, Create the led.h file On Arduino IDE with the following content.
- Similarly, Create the temperature.h file On Arduino IDE with the following content.
- Similarly, Create the error_404.h file On Arduino IDE with the following content.
- Now you have multiple files on Arduino IDE like below:
- Click Upload button on Arduino IDE to upload code to Arduino Nano ESP32
- Access the web pages of Arduino Nano ESP32 board via web browser one by one as before. You will see all web page as below:
/*
* This Arduino Nano ESP32 code was developed by newbiely.com
*
* This Arduino Nano ESP32 code is made available for public use without any restriction
*
* For comprehensive instructions and wiring diagrams, please visit:
* https://newbiely.com/tutorials/arduino-nano-esp32/arduino-nano-esp32-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.html">LED Page</a></li>
<li><a href="/temperature.html">Temperature Page</a></li>
</ul>
</body>
</html>
)=====";
/*
* This Arduino Nano ESP32 code was developed by newbiely.com
*
* This Arduino Nano ESP32 code is made available for public use without any restriction
*
* For comprehensive instructions and wiring diagrams, please visit:
* https://newbiely.com/tutorials/arduino-nano-esp32/arduino-nano-esp32-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%</span></p>
<a href='/led.html?state=on'>Turn ON</a>
<br><br>
<a href='/led.html?state=off'>Turn OFF</a>
</body>
</html>
)=====";
/*
* This Arduino Nano ESP32 code was developed by newbiely.com
*
* This Arduino Nano ESP32 code is made available for public use without any restriction
*
* For comprehensive instructions and wiring diagrams, please visit:
* https://newbiely.com/tutorials/arduino-nano-esp32/arduino-nano-esp32-web-server-multiple-pages
*/
const char *HTML_CONTENT_TEMPERATURE = R"=====(
<!DOCTYPE html>
<html>
<head>
<title>Arduino Nano ESP32 - 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_VALUE%);
}
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 Nano ESP32 - Web Temperature</h1>
<canvas id="cvs"></canvas>
</body>
</html>
)=====";
/*
* This Arduino Nano ESP32 code was developed by newbiely.com
*
* This Arduino Nano ESP32 code is made available for public use without any restriction
*
* For comprehensive instructions and wiring diagrams, please visit:
* https://newbiely.com/tutorials/arduino-nano-esp32/arduino-nano-esp32-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 Esp32 Web Server.</p>
<p>Please check the URL or go back to the <a href="/">homepage</a>.</p>
<p>Or check <a href="https://esp32io.com/tutorials/esp32-web-server-multiple-pages"> Esp32 Web Server</a> tutorial.</p>
</body>
</html>
)=====";
