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ESP32 Web Server LED Control - ESP32 IOT Projects



 

Components Required

  • ESP32 Development Board
  • 2 × LEDs (any color)
  • 2 × 220Ω resistors
  • Breadboard & jumper wires
  • USB cable for programming ESP32

Circuit Connection :


Connect LED1 anode (long leg) → 220ohm resistor → GPIO16.

Connect LED2 anode (long leg) → 220ohm resistor → GPIO17.

Both LED cathodes (short leg) → GND.



Step 1: Install Arduino IDE & ESP32 Board


Download and install the Arduino IDE from Arduino.cc
.

Add ESP32 board support:

Go to File > Preferences.

In Additional Board Manager URLs, add:

https://dl.espressif.com/dl/package_esp32_index.json

Go to Tools > Board > Board Manager, search ESP32, and install.


Step 2: Connect ESP32 and Select Board


Plug ESP32 into your computer with USB cable.

In Arduino IDE:

Go to Tools > Board → Select ESP32 Dev Module.

Select the correct Port.


Step 3: Full Arduino Code

#include <WiFi.h>

// Replace with your network credentials
const char* ssid = "YOUR_WIFI_SSID";
const char* password = "YOUR_WIFI_PASSWORD";

// GPIO pins
const int led1 = 16;
const int led2 = 17;

// Web server runs on port 80
WiFiServer server(80);

// Store HTTP request
String header;

// Current state of LEDs
String led1State = "off";
String led2State = "off";

void setup() {
  Serial.begin(115200);

  // Initialize the output variables as outputs
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);

  // Set both LEDs to off
  digitalWrite(led1, LOW);
  digitalWrite(led2, LOW);

  // Connect to Wi-Fi
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());

  // Start the server
  server.begin();
}

void loop() {
  WiFiClient client = server.available();   // Listen for incoming clients

  if (client) {
    Serial.println("New Client Connected.");
    String currentLine = "";
    header = "";

    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        header += c;

        if (c == '\n') {
          if (currentLine.length() == 0) {
            // Send HTTP response
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println("Connection: close");
            client.println();

            // LED control
            if (header.indexOf("GET /led1/on") >= 0) {
              digitalWrite(led1, HIGH);
              led1State = "on";
            } else if (header.indexOf("GET /led1/off") >= 0) {
              digitalWrite(led1, LOW);
              led1State = "off";
            } else if (header.indexOf("GET /led2/on") >= 0) {
              digitalWrite(led2, HIGH);
              led2State = "on";
            } else if (header.indexOf("GET /led2/off") >= 0) {
              digitalWrite(led2, LOW);
              led2State = "off";
            }

            // HTML Page
            client.println("<!DOCTYPE html><html>");
            client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
            client.println("<style>");
            client.println("body { font-family: Arial; text-align: center; }");
            client.println(".button { padding: 15px 40px; font-size: 20px; margin: 10px; border: none; border-radius: 8px; }");
            client.println(".on { background-color: green; color: white; }");
            client.println(".off { background-color: red; color: white; }");
            client.println("</style></head>");
            client.println("<body><h2>ESP32 Web Server - LED Control</h2>");

            // LED1 Buttons
            client.println("<p>LED1 - State: " + led1State + "</p>");
            if (led1State == "off") {
              client.println("<a href=\"/led1/on\"><button class=\"button on\">ON</button></a>");
            } else {
              client.println("<a href=\"/led1/off\"><button class=\"button off\">OFF</button></a>");
            }

            // LED2 Buttons
            client.println("<p>LED2 - State: " + led2State + "</p>");
            if (led2State == "off") {
              client.println("<a href=\"/led2/on\"><button class=\"button on\">ON</button></a>");
            } else {
              client.println("<a href=\"/led2/off\"><button class=\"button off\">OFF</button></a>");
            }

            client.println("</body></html>");
            client.println();
            break;
          } else {
            currentLine = "";
          }
        } else if (c != '\r') {
          currentLine += c;
        }
      }
    }
    // Close connection
    client.stop();
    Serial.println("Client disconnected.");
    Serial.println("");
  }
}



Step 4: Upload the Code


Replace YOUR_WIFI_SSID and YOUR_WIFI_PASSWORD with your Wi-Fi details.

Click Upload in Arduino IDE.

Open Serial Monitor at 115200 baud.

Copy the ESP32 IP Address displayed.



Step 5: Control LEDs from Browser


Open a browser on your phone/PC.

Enter the IP address of ESP32 (e.g., http://192.168.1.45).

You’ll see a simple web page with ON/OFF buttons for LED1 and LED2.

Tap the buttons → LEDs will toggle ON/OFF instantly.



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