IoT Web LED Controller

Control an ESP32 or ESP8266 GPIO pin (LED) directly from a web browser using an asynchronous web server.
The project provides real-time LED control with authentication and WiFi fail-safe protection.

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Overview

This project demonstrates how to build a lightweight IoT web interface on ESP32/ESP8266 using an asynchronous HTTP server.
It allows authenticated users to toggle a GPIO pin (LED) from any browser connected to the same network.

Designed to be:

• Simple to deploy
• Fast and non-blocking
• Easy to extend for real IoT applications

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Features

• Asynchronous web server (non-blocking)
• HTTP Basic Authentication
• Instant LED state update without page reload
• ESP32 and ESP8266 compatible
• WiFi connection timeout protection
• Single .ino file for easy upload
• Minimal hardware requirements

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Hardware Requirements

Component	Pin	Description
ESP32 Dev Board	GPIO 2	Built-in LED
External LED	GPIO 2	Optional
Resistor	220Ω	Current limiting
Jumper Wires	—	Connections

Connection:
GPIO 2 → LED → 220Ω resistor → GND

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Software Requirements

• Arduino IDE (latest recommended)
• ESP32 or ESP8266 board support installed
• Required libraries:
  • ESPAsyncWebServer
  • AsyncTCP (ESP32) or ESPAsyncTCP (ESP8266)

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