How to Control LED Wirelessly Using ESP8266 Web Server

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Project Level: Beginner

Time Required: 10–15 Minutes

Budget: Low Cost

Control: Mobile Browser (No App Needed)

INTRODUCTION

In this project, we will learn how to control an LED wirelessly using ESP8266 NodeMCU and a web server.

ESP8266 creates a web server, and you can turn the LED ON and OFF using your mobile browser over WiFi. This is a basic and important IoT project for beginners.

WATCH YOUTUBE VIDEO

Watch full working of ESP8266 LED Control:

COMPONENTS REQUIRED

Item Image	Item Name	Quantity	Buy
	ESP8266 NodeMCU	1	{getButton} $text={Buy Now} $icon={cart} $color={#007bff} $size={2}
	Breadboard	1	{getButton} $text={Buy Now} $icon={cart} $color={#007bff}
	LED (Any Color)	1	{getButton} $text={Buy Now} $icon={cart} $color={#007bff}
	Jumper Wires	As Required	{getButton} $text={Buy Now} $icon={cart} $color={#007bff}
	Micro USB Cable	1	{getButton} $text={Buy Now} $icon={cart} $color={#007bff}

TOOLS REQUIRED

Image	Tool	Qty	Buy
	Screwdriver	1	{getButton} $text={Buy Tool} $icon={cart} $color={#007bff}
	Wire Cutter	1	{getButton} $text={Buy Tool} $icon={cart} $color={#007bff}
	Glue Gun	Optional	{getButton} $text={Buy Tool} $icon={cart} $color={#007bff}

APPS AND ONLINE SERVICES

Logo	App	Access
	Arduino IDE	{getButton} $text={Download} $icon={download} $color={#007bff}

CIRCUIT DIAGRAM

Connect LED to D4 pin of ESP8266 using a resistor.

WIRING CONNECTIONS

ESP8266 ↔ LED

Component	Connection
LED Positive	D4
LED Negative	GND

ARDUINO CODE

#include <ESP8266WiFi.h> const char* ssid = "ssid"; const char* password = "ssid password"; int ledPin = D4; WiFiServer server(80); void setup() { Serial.begin(115200); pinMode(ledPin, OUTPUT); digitalWrite(ledPin, LOW); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); } server.begin(); } void loop() { WiFiClient client = server.available(); if (!client) return; String request = client.readStringUntil('\r'); client.flush(); if (request.indexOf("/LEDON") != -1) digitalWrite(ledPin, HIGH); if (request.indexOf("/LEDOFF") != -1) digitalWrite(ledPin, LOW); client.print( "HTTP/1.1 200 OK\r\n" "Content-Type: text/html\r\n\r\n" "<h1>ESP8266 LED Control</h1>" "<button onclick=\"location.href='/LEDON'\">ON</button>" "<button onclick=\"location.href='/LEDOFF'\">OFF</button>" ); }

WORKING PRINCIPLE

ESP8266 connects to WiFi and creates a web server. When you open the IP address in browser, you can control LED ON/OFF.

TIPS

• Enter correct WiFi name and password
• Check IP address in serial monitor
• Use resistor with LED

CONCLUSION

This project is a beginner-friendly IoT application and helps you understand web-based control using ESP8266.

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