📶 Connecting ESP32 to WiFi Network

WiFi connectivity is what makes ESP32 an IoT device! Connect your soil moisture sensors, weather stations, and irrigation controllers to the internet and access data from anywhere in the world.

📖 Basic WiFi Connection Code

#include <WiFi.h>

const char* ssid = "YOUR_WIFI_NAME";
const char* password = "YOUR_WIFI_PASSWORD";

void setup() {
    Serial.begin(115200);
    delay(1000);
    
    Serial.println("\n📡 Connecting to WiFi...");
    WiFi.begin(ssid, password);
    
    // Wait up to 10 seconds for connection
    int attempts = 0;
    while (WiFi.status() != WL_CONNECTED && attempts < 20) {
        delay(500);
        Serial.print(".");
        attempts++;
    }
    
    Serial.println();
    
    if (WiFi.status() == WL_CONNECTED) {
        Serial.println("✅ WiFi connected!");
        Serial.print("📡 IP address: ");
        Serial.println(WiFi.localIP());
    } else {
        Serial.println("❌ WiFi connection failed!");
        Serial.println("   Check SSID, password, and signal strength");
    }
}

void loop() {
    // Your sensor reading code here
    delay(60000);
}
    

🔐 Secure WiFi with Auto-Reconnection

#include <WiFi.h>

const char* ssid = "YOUR_WIFI";
const char* password = "YOUR_PASSWORD";
unsigned long lastAttempt = 0;
bool wifiConnected = false;

void connectToWiFi() {
    Serial.print("📡 Connecting to WiFi");
    WiFi.begin(ssid, password);
    
    int attempts = 0;
    while (WiFi.status() != WL_CONNECTED && attempts < 20) {
        delay(500);
        Serial.print(".");
        attempts++;
    }
    
    Serial.println();
    
    if (WiFi.status() == WL_CONNECTED) {
        Serial.println("✅ WiFi connected!");
        Serial.print("📡 IP address: ");
        Serial.println(WiFi.localIP());
        wifiConnected = true;
    } else {
        Serial.println("❌ WiFi connection failed!");
        wifiConnected = false;
    }
}

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

void loop() {
    // Check connection status
    if (WiFi.status() != WL_CONNECTED) {
        Serial.println("⚠️ WiFi disconnected!");
        
        // Retry every 30 seconds
        if (millis() - lastAttempt > 30000) {
            Serial.println("🔄 Attempting to reconnect...");
            connectToWiFi();
            lastAttempt = millis();
        }
    } else {
        // WiFi is connected - do your work here
        // Read sensors, send data to cloud, etc.
    }
    
    delay(1000);
}
    

📊 WiFi Status Codes