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ESP8266_WIFI_MODULE.md

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ESP8266 WiFi Module

This repository provides setup instructions and example code for using the ESP8266 WiFi module with an Arduino to enable wireless communication.

📌 Features

  • Connects Arduino to WiFi for IoT applications
  • Supports HTTP web server functionality
  • Can control electrical appliances remotely via a web interface
  • Compatible with Arduino Uno, Mega, and Nano

🛠 Requirements

🔹 Hardware:

  • ESP8266 WiFi Module
  • Arduino Board (Uno, Mega, Nano, etc.)
  • Jumper Wires
  • Relay Module (for appliance control)
  • Power Supply (3.3V for ESP8266)

🔹 Software:

⚡ Wiring Connections

ESP8266 Pin Arduino Pin
VCC 3.3V
GND GND
TX RX (D0)
RX TX (D1)
CH_PD 3.3V

📌 Important: ESP8266 operates at 3.3V. Do not connect it to 5V, as it may damage the module.

📥 Library Installation

  1. Open Arduino IDE
  2. Go to Sketch → Include Library → Manage Libraries
  3. Search for ESP8266WiFi
  4. Install the library

🚀 Example Code

Upload the following code to test your ESP8266 module:

#include <ESP8266WiFi.h>

const char* ssid = "Your_SSID";
const char* password = "Your_PASSWORD";

WiFiServer server(80);

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting...");
  }
  Serial.println("Connected to WiFi");
  server.begin();
}

void loop() {
  WiFiClient client = server.available();
  if (client) {
    Serial.println("Client connected");
    client.println("HTTP/1.1 200 OK\nContent-Type: text/html\n\n");
    client.println("<h1>ESP8266 Web Server</h1>");
    client.stop();
  }
}

🔹 Modify ssid and password to match your WiFi credentials. 🔹 Open Serial Monitor (115200 baud) to check the connection status.

📌 Notes

  • Use level shifter or voltage divider for RX pin (ESP8266 runs on 3.3V logic).
  • If ESP8266 does not respond, press RESET or flash the firmware.
  • Check if the baud rate matches in Serial Monitor.

📜 License

This project is open-source and available under the MIT License.

🙌 Credits

🚀 Happy IoT Development! 🎉