This tutorial guides you to build an ESP8266 Web Server that controls two LEDs. This ESP8266 Web page is responsive and it can be accessed with any device with a browser in your local network.
Table of Contents
Project Overview
The following figure shows an overview of what we’re going to do in this project:
Parts Required
In this tutorial, we’ll control two LEDs. So, we need the following parts:
- ESP8266 development board
- Two LEDs
- Breadboard
- Jumper wires
Installing Libraries
To build the ESP8266 Web Server you need to install the following libraries. You can click the following links to download the libraries.
Installing the ESP8266WebServer Library
- Click here to download the ESP8266WebServer Library. You should have a .zip folder in your Downloads folder.
- You can go to Sketch > Include Library > Add. ZIP library and select the library you’ve just downloaded.
Arduino code for ESP8266 Web Server
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#define output2 2
#define output0 0
// Create the objects for server and client
WiFiServer server(80);
WiFiClient client;
const char* ssid = "ESP_AP"; // This is the SSID that ESP32 will broadcast
const char* password = "12345678"; // password should be atleast 8 characters to make it work
// Create the global variable
String http;
String output2State = "off";
String output0State = "off";
void setup() {
Serial.begin(9600);
pinMode(output2, OUTPUT);
pinMode(output0, OUTPUT);
digitalWrite(output2, LOW);
digitalWrite(output0, LOW);
Serial.print("Connecting to ");
Serial.println(ssid);
// Create the ESP32 access point
WiFi.softAP(ssid, password);
Serial.println( "" );
Serial.println( "WiFi AP is now running" );
Serial.println( "IP address: " );
Serial.println( WiFi.softAPIP() );
// Start our ESP32 server
server.begin();
}
void loop(){
if ( client = server.available() ) { // Checks if a new client tries to connect to our server
Serial.println("New Client.");
String clientData = "";
while ( client.connected() ) { // Wait until the client finish sending HTTP request
if ( client.available() ) { // If there is a data,
char c = client.read(); // read one character
http += c; // then parse it
Serial.write(c);
if (c == '\n') { // If the character is carriage return,
// it means end of http request from client
if (clientData.length() == 0) { // Now that the clientData is cleared,
sendResponse(); // perform the necessary action
updateLED();
updateWebpage();
break;
} else {
clientData = ""; // First, clear the clientData
}
} else if (c != '\r') { // Or if the character is NOT new line
clientData += c; // store the character to the clientData variable
}
}
}
http = "";
client.stop(); // Disconnect the client.
Serial.println("Client disconnected.");
Serial.println("");
}
}
void sendResponse() {
// Send the HTTP response headers
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("Connection: close");
client.println();
}
void updateWebpage() {
// Send the whole HTML
client.println("<!DOCTYPE html><html>");
client.println("<head>");
client.println("<title>LED Status</title>");
client.println("</head>");
client.println("<head>");
client.println("<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
client.println("</style></head>");
// Web Page Heading
client.println("<body><h1>ESP Web Server!</h1>");
// Display buttons for Blue LED
client.println("<p>1. GPIO 2 is " + output2State + "</p>");
if (output2State == "off") {
client.println("<p><a href=\"/2/on\"><button>Turn ON</button></a></p>");
} else {
client.println("<p><a href=\"/2/off\"><button>Turn OFF</button></a></p>");
}
client.print("<hr>");
// Display buttons for Green LED
client.println("<p>2. GPIO 0 is " + output0State + "</p>");
if (output0State == "off") {
client.println("<p><a href=\"/0/on\"><button>Turn ON</button></a></p>");
} else {
client.println("<p><a href=\"/0/off\"><button>Turn OFF</button></a></p>");
}
client.println("</body></html>");
client.println();
}
void updateLED() {
if(http.indexOf("GET /2/on") >= 0) {
Serial.println("GPIO 2 LED on");
output2State = "on";
digitalWrite(output2, HIGH);
} else if (http.indexOf("GET /2/off") >= 0) {
Serial.println("GPIO 2 LED off");
output2State = "off";
digitalWrite(output2, LOW);
} else if (http.indexOf("GET /0/on") >= 0) {
Serial.println("GPIO 0 LED on");
output0State = "on";
digitalWrite(output0, HIGH);
} else if (http.indexOf("GET /0/off") >= 0) {
Serial.println("GPIO 0 off");
output0State = "off";
digitalWrite(output0, LOW);
}
}
Testing the ESP8266 Web Server
Now, you can upload the code, open the Serial Monitor at a baud rate of 9600 and press the ESP8266 RESET button.
Copy that IP address, because you need it to access the ESP8266 Web Server.
Connect to ESP_AP Network
Insert your network credentials, so that the ESP8266 can connect to your local network.
Accessing the ESP8266 Web Server page
Type the ESP8266 IP address on the web browser, and you’ll see the following page.
Also Read: ESP8266 and Node-RED with MQTT (Publish-Subscribe)
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