WiFi Web Client

/*

  Web client

 This sketch connects to a website (http://www.google.com)

 using a WiFi shield.

 This example is written for a network using WPA encryption. For

 WEP or WPA, change the Wifi.begin() call accordingly.

 This example is written for a network using WPA encryption. For

 WEP or WPA, change the Wifi.begin() call accordingly.

 Circuit:

 * WiFi shield attached

 created 13 July 2010

 by dlf (Metodo2 srl)

 modified 31 May 2012

 by Tom Igoe

 */

#include <SPI.h>
#include <WiFi.h>

char ssid[] = "yourNetwork"; //  your network SSID (name)
char pass[] = "secretPassword";    // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0;            // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128);  // numeric IP for Google (no DNS)
char server[] = "www.google.com";    // name address for Google (using DNS)

// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):

WiFiClient client;

void setup() {

  //Initialize serial and wait for port to open:

  Serial.begin(9600);

  while (!Serial) {

    ; // wait for serial port to connect. Needed for native USB port only

  }

  // check for the presence of the shield:

  if (WiFi.status() == WL_NO_SHIELD) {

    Serial.println("WiFi shield not present");

    // don't continue:

    while (true);

  }

  String fv = WiFi.firmwareVersion();

  if (fv != "1.1.0") {

    Serial.println("Please upgrade the firmware");

  }

  // attempt to connect to Wifi network:

  while (status != WL_CONNECTED) {

    Serial.print("Attempting to connect to SSID: ");

    Serial.println(ssid);

    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:

    status = WiFi.begin(ssid, pass);

    // wait 10 seconds for connection:

    delay(10000);

  }

  Serial.println("Connected to wifi");

  printWifiStatus();

  Serial.println("\nStarting connection to server...");

  // if you get a connection, report back via serial:

  if (client.connect(server, 80)) {

    Serial.println("connected to server");

    // Make a HTTP request:

    client.println("GET /search?q=arduino HTTP/1.1");

    client.println("Host: www.google.com");

    client.println("Connection: close");

    client.println();

  }
}

void loop() {

  // if there are incoming bytes available

  // from the server, read them and print them:

  while (client.available()) {

    char c = client.read();

    Serial.write(c);

  }

  // if the server's disconnected, stop the client:

  if (!client.connected()) {

    Serial.println();

    Serial.println("disconnecting from server.");

    client.stop();

    // do nothing forevermore:

    while (true);

  }
}

void printWifiStatus() {

  // print the SSID of the network you're attached to:

  Serial.print("SSID: ");

  Serial.println(WiFi.SSID());

  // print your WiFi shield's IP address:

  IPAddress ip = WiFi.localIP();

  Serial.print("IP Address: ");

  Serial.println(ip);

  // print the received signal strength:

  long rssi = WiFi.RSSI();

  Serial.print("signal strength (RSSI):");

  Serial.print(rssi);

  Serial.println(" dBm");
}