IoT Engineering Course using ESP32 Wifi Robots

📘 WiFi Connectivity Implementation

🎯 Lesson Objective

In this lesson, students will learn:

How ESP32 connects to WiFi
How to write WiFi connection code
How to monitor connection status using Serial Monitor
Basic troubleshooting of WiFi connection issues

By the end of this lesson, students will be able to connect ESP32 to the internet successfully.

🌐 Concept Introduction

ESP32 has built-in WiFi, which allows it to connect to a wireless network just like a smartphone.

Once connected, it can:

Send and receive data
Communicate with cloud platforms
Control devices remotely

📡 WiFi Modes in ESP32

ESP32 supports two main modes:

Station Mode (STA) → Connects to an existing WiFi network
Access Point Mode (AP) → Creates its own WiFi network

👉 In this project, we use Station Mode

🔐 WiFi Credentials

To connect ESP32 to WiFi, we need:

SSID → WiFi name
Password → WiFi password

💻 ESP32 WiFi Connection Code

#include <WiFi.h>

const char* ssid = “YourWiFiName”;
const char* password = “YourPassword”;

void setup() {
Serial.begin(9600);

WiFi.begin(ssid, password);

Serial.print(“Connecting to WiFi”);

while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(“.”);
}

Serial.println(“\nConnected to WiFi!”);
Serial.print(“IP Address: “);
Serial.println(WiFi.localIP());
}

void loop() {
}

🔍 Code Explanation

#include <WiFi.h> → Enables WiFi functionality
WiFi.begin() → Starts connection
WiFi.status() → Checks connection status
WL_CONNECTED → Confirms successful connection
WiFi.localIP() → Displays IP address

🧪 Practical Activity

Replace:
- YourWiFiName
- YourPassword
Upload code to ESP32
Open Serial Monitor
Observe:
- Connecting…
- Connected message
- IP Address

🧠 Key Learning Concepts

Wireless communication
Device networking
Real-time connection monitoring
Debugging using Serial Monitor

⚠️ Common Issues & Solutions

Problem	Solution
Not connecting	Check SSID & password
Continuous dots (…)	Weak signal or wrong credentials
ESP32 restarting	Power supply issue
No output in Serial Monitor	Check baud rate (9600)

🔧 Troubleshooting Tips

Keep ESP32 close to WiFi router
Use mobile hotspot if router fails
Restart ESP32 and router
Verify correct board selection in IDE

📝 Lesson Summary

In this lesson, students learned how to connect ESP32 to a WiFi network using programming. They also understood how to monitor and debug the connection using the Serial Monitor.

📌 Practice Task

Connect ESP32 to a different WiFi network
Note the IP address
Try disconnecting WiFi and observe behavior