📡 ESP8266 Wi-Fi Setup with AP Mode & LED Indicator

This project allows an ESP8266 to connect to a Wi-Fi network using WiFiManager. If no credentials are saved, the ESP starts in Access Point (AP) mode, where users can enter their Wi-Fi details. The onboard LED turns ON when in AP mode and OFF when connected to Wi-Fi.

🚀 Features

• 📶 Wi-Fi AutoConnect: Tries to connect to the last saved network.
• 🔒 Password-Protected AP Mode: Users enter Wi-Fi credentials via a web portal.
• 💡 LED Indicator:
  • ON (LOW) → AP Mode (Wi-Fi setup required)
  • OFF (HIGH) → Connected to Wi-Fi
• 🔄 Auto Reconnect: Saves credentials and reconnects automatically.

🛠 Hardware Requirements

• ESP8266 (NodeMCU, Wemos D1 Mini, etc.)
• Micro USB cable
• Computer with Arduino IDE

📝 Installation

1. Install Dependencies:

   • Install WiFiManager library in Arduino IDE.
   • Add ESP8266 Board Package via Boards Manager.

2. Flash the Code:

   • Open the .ino file in Arduino IDE.
   • Select Board: "NodeMCU 1.0 (ESP-12E Module)".
   • Connect ESP8266 and upload the code.

📜 Code Overview

#include <ESP8266WiFi.h>
#include <WiFiManager.h>  

#define LED_PIN 2  // Onboard LED (D4 on NodeMCU)

void setup() {
    Serial.begin(115200);
    pinMode(LED_PIN, OUTPUT);
    digitalWrite(LED_PIN, HIGH);  // Default OFF (ESP8266 LED is active LOW)

    WiFiManager wifiManager;

    // Set up AP mode with password protection
    wifiManager.setAPCallback(configModeCallback);

    if (!wifiManager.autoConnect("ESP_Config", "MySecretPass")) {
        Serial.println("Failed to connect. Restarting...");
        ESP.restart();
    }

    Serial.println("Connected to Wi-Fi!");
    digitalWrite(LED_PIN, HIGH);  // Turn OFF LED
}

// Function called when AP mode is activated
void configModeCallback(WiFiManager *myWiFiManager) {
    Serial.println("ESP in AP Mode. Connect to 'ESP_Config' to set Wi-Fi.");
    digitalWrite(LED_PIN, LOW);  // Turn ON LED
}

void loop() {
    // Main code execution
}