The Importance and Utility of Wi-Fi Module

The Wi-Fi module is an essential component in the field of electronics and Internet of Things (IoT). It allows Arduino boards to connect to the internet wirelessly, enabling a wide range of applications such as remote monitoring, home automation, and data logging. With the Wi-Fi module, Arduino becomes capable of accessing web services, sending and receiving data, and interacting with other devices over the internet.

Project: Arduino Weather Station

In this example project, we will create an Arduino Weather Station that collects temperature and humidity data from a sensor and sends it to an online platform for monitoring. The goal is to demonstrate how the Wi-Fi module can be used to connect Arduino to the internet and transmit data in real-time.

List of Components:

• Arduino Uno board x1 (https://www.arduino.cc/en/Main/ArduinoBoardUno)
• ESP8266 Wi-Fi module x1 (https://www.sparkfun.com/products/13678)
• DHT11 temperature and humidity sensor x1 (https://www.adafruit.com/product/386)
• Breadboard x1 (https://www.sparkfun.com/products/12002)
• Jumper wires (male-to-male and male-to-female) (https://www.sparkfun.com/products/11710)

Examples:

1. Setting up the Wi-Fi module:

   
   #include <ESP8266WiFi.h>

const char ssid = "YourNetworkSSID"; const char password = "YourNetworkPassword";

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

while (WiFi.status() != WL_CONNECTED) { delay(1000); Serial.println("Connecting to WiFi..."); }

Serial.println("Connected to WiFi!"); }

void loop() { // Your code here }

2. Reading data from the DHT11 sensor:
```arduino
#include <DHT.h>

#define DHTPIN 2
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

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

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C");

  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print(" %");

  delay(2000);
}

3. Sending data to an online platform:

   
   #include <ESP8266WiFi.h>
   #include <WiFiClient.h>

const char ssid = "YourNetworkSSID"; const char password = "YourNetworkPassword"; const char* server = "api.example.com";

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

while (WiFi.status() != WL_CONNECTED) { delay(1000); Serial.println("Connecting to WiFi..."); }

Serial.println("Connected to WiFi!"); }

void loop() { float temperature = getTemperature(); float humidity = getHumidity();

if (WiFi.status() == WL_CONNECTED) { WiFiClient client;

if (client.connect(server, 80)) {
  String url = "/data?temperature=" + String(temperature) + "&humidity=" + String(humidity);
  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + server + "\r\n" +
               "Connection: close\r\n\r\n");

  while (client.connected()) {
    if (client.available()) {
      String line = client.readStringUntil('\r');
      Serial.println(line);
    }
  }

  client.stop();
}

}

delay(5000); }