Creating a Simple ESP32 WiFi Blink Server: A Step-by-Step Guide

Creating a Simple ESP32 WiFi Blink Server: Step-by-Step Guide

Learn how to build a simple ESP32 WiFi blink server in this step-by-step guide. We'll walk you through the process of setting up the ESP32, programming the blink functionality, and creating a web server to control the blinking. Perfect for beginners looking to get started with ESP32 and IoT projects."

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1. Circuit Diagram:-

2. Project Code:-

#include <WiFi.h>
const char* ssid     = "OPPO A15s";
const char* password = "12345678";
WiFiServer server(80);

void setup()
{
    Serial.begin(115200);
    pinMode(2, OUTPUT);      // set the LED pin mode
    delay(10);
    // We start by 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());
    server.begin();}
     int value = 0;

void loop(){
 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");
            client.println("Content-type:text/html");
            client.println();
           // Display the HTML web page
            client.println("<!DOCTYPE html><html>");
            client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
            client.println("<link rel=\"icon\" href=\"data:,\">");
            // CSS to style the on/off buttons 
            // Feel free to change the background-color and font-size attributes to fit your preferences
            client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
            client.println(".button { background-color: #4CAF50; border: none; color: white; padding: 16px 40px;");
            client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
            client.println(".button2 {background-color: #555555;}</style></head>");
           // the content of the HTTP response follows the header:
            client.print("<p><a href=\"/H/on\"><button class=\"button\">ON</button></a></p>");
            client.print("<p><a href=\"/L/on\"><button class=\"button\">OFF</button></a></p>");
           // The HTTP response ends with another blank line:
            client.println();
            // break out of the while loop:
            break;
          } 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(2, HIGH);               // GET /H turns the LED on
        }
        if (currentLine.endsWith("GET /L")) {
          digitalWrite(2, LOW);                // GET /L turns the LED off
        }
      }
    }
    // close the connection:
    client.stop();
    Serial.println("Client Disconnected.");
  }
}

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