ESP8266 Course

Lesson 1: ESP8266 Basics

ESP8266 is a WiFi microcontroller. It is perfect for IoT projects like smart home control, web dashboards, weather stations, and sensor alerts.

• Use 3.3V logic only.
• Power the board with USB or regulated 5V/VIN where supported.
• Do not connect 5V sensor signal directly to ESP8266 pins.

Lesson 2: Board Setup

1. Install Arduino IDE.
2. Add ESP8266 board package URL in preferences.
3. Install ESP8266 boards from Boards Manager.
4. Select NodeMCU 1.0 or your exact board.

Lesson 3: Connect To WiFi

#include <ESP8266WiFi.h>

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

void setup() {
 Serial.begin(115200);
 WiFi.begin(ssid, password);

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

 Serial.println();
 Serial.print("IP Address: ");
 Serial.println(WiFi.localIP());
}

void loop() {
}

WiFi Problem Checklist

• ESP8266 usually needs 2.4 GHz WiFi, not 5 GHz only networks.
• Check spelling and spaces in WiFi name and password.
• Keep the board close to router while testing.

Lesson 4: Web Server LED Control

#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>

ESP8266WebServer server(80);
const int ledPin = D4;

void handleRoot() {
 server.send(200, "text/html",
  "<h1>ESP8266 LED</h1><a href='/on'>ON</a> <a href='/off'>OFF</a>");
}

void setup() {
 pinMode(ledPin, OUTPUT);
 WiFi.begin("YOUR_WIFI_NAME", "YOUR_WIFI_PASSWORD");
 while (WiFi.status() != WL_CONNECTED) delay(500);

 server.on("/", handleRoot);
 server.on("/on", [](){ digitalWrite(ledPin, LOW); server.send(200, "text/plain", "LED ON"); });
 server.on("/off", [](){ digitalWrite(ledPin, HIGH); server.send(200, "text/plain", "LED OFF"); });
 server.begin();
}

void loop() {
 server.handleClient();
}

Lesson 5: Sensor Dashboard

Connect a DHT11/DHT22 or analog sensor and display values on a web page. Start by printing sensor values in Serial Monitor, then add WiFi.

• First test the sensor alone.
• Then add web server code.
• Refresh the browser to see updated values.

Final Project: IoT Room Monitor

Create a room monitor that shows temperature, humidity, or gas sensor status on a local web page.

• Use ESP8266 web server.
• Add sensor reading.
• Add clear status text: Normal, Warning, Alert.
• Use Robo AI for WiFi, upload, and sensor reading doubts.