(:source http://github.com/arduino/Arduino/raw/master/libraries/WiFi/examples/WiFiWebClient/WiFiWebClient.ino lang=arduino tabwidth=4:)

(:source lang=arduino tabwidth=4:) /*

  Repeating Wifi Web client

 This sketch connects to a a web server and makes a request
 using an Arduino Wifi shield.

 Circuit:
 * Wifi shield attached to pins 10, 11, 12, 13

 created 23 Apr 2012
 by Tom Igoe

 http://arduino.cc/en/Tutorial/WifiWebClientRepeating
 This code is in the public domain.
 */

1. include <SPI.h>
2. include <WiFi.h>

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

int status = WL_IDLE_STATUS;

// Initialize the Wifi client library WiFiClient client;

// server address: char server[] = "www.arduino.cc"; //IPAddress server(64,131,82,241);

unsigned long lastConnectionTime = 0; // last time you connected to the server, in milliseconds boolean lastConnected = false; // state of the connection last time through the main loop const unsigned long postingInterval = 10*1000; // delay between updates, in milliseconds

void setup() {

  // start serial port:
  Serial.begin(9600);

  // attempt to connect to Wifi network:
  while ( status != WL_CONNECTED) { 
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);
    status = WiFi.begin(ssid, pass);
    // wait 10 seconds for connection:
    delay(10000);
  } 
  // you're connected now, so print out the status:
  printWifiStatus();

}

void loop() {

  // if there's incoming data from the net connection.
  // send it out the serial port.  This is for debugging
  // purposes only:
  while (client.available()) {
    char c = client.read();
    Serial.write(c);
  }

  // if there's no net connection, but there was one last time
  // through the loop, then stop the client:
  if (!client.connected() && lastConnected) {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();
  }

  // if you're not connected, and ten seconds have passed since
  // your last connection, then connect again and send data:
  if(!client.connected() && (millis() - lastConnectionTime > postingInterval)) {
    httpRequest();
  }
  // store the state of the connection for next time through
  // the loop:
  lastConnected = client.connected();

}

// this method makes a HTTP connection to the server: void httpRequest() {

  // if there's a successful connection:
  if (client.connect(server, 80)) {
    Serial.println("connecting...");
    // send the HTTP PUT request:
    client.println("GET /latest.txt HTTP/1.1");
    client.println("Host: www.arduino.cc");
    client.println("User-Agent: arduino-ethernet");
    client.println("Connection: close");
    client.println();

    // note the time that the connection was made:
    lastConnectionTime = millis();
  } 
  else {
    // if you couldn't make a connection:
    Serial.println("connection failed");
    Serial.println("disconnecting.");
    client.stop();
  }

}

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");

}

(:sourceend:)

Attach:WiFiWebClientRepeating_bb.png.png Δ

Examples > WiFi Library

WiFi Web Client Repeating

This example shows you how to make repeated HTTP requests using a WiFi shield. It connects to http://www.arduino.cc/latest.txt. The content of the page is viewable through your Arduino's serial window.

This example is written for a network using WPA encryption. For WEP or WPA, change the Wifi.begin() call accordingly.

(:div class=BOM :)

Hardware Required

• Arduino WiFi Shield
• Shield-compatible Arduino board

(:divend:)

Circuit

(:div class=circuit :)

The WiFi shield uses pins 10, 11, 12, and 13 for the SPI connection to the HDG104 module. Digital pin 4 is used to control the slave select pin on the SD card.

You should have access to a 802.11b/g wireless network that connects to the internet for this example. You will need to change the network settings in the sketch to correspond to your particular networks SSID.

For networks using WPA/WPA2 Personal encryption, you need the SSID and password. The shield will not connect to networks using WPA2 Enterprise encryption.

WEP network passwords are hexadecimal strings known as keys. A WEP network can have 4 different keys; each key is assigned a "Key Index" value. For WEP encrypted networks, you need the SSID, the key, and key number.

Attach:PachubeClient_bb.png.png Δ Δ

image developed using Fritzing. For more circuit examples, see the Fritzing project page

In the above image, the Arduino would be stacked below the WiFi shield.

(:divend:)

Schematic

(:div class=circuit :)

(:divend:)

Code:

(:div class=code :) (:source http://github.com/arduino/Arduino/raw/master/libraries/WiFi/examples/WiFiWebClient/WiFiWebClient.ino lang=arduino tabwidth=4:) (:divend:)

See Also:

(:include WiFiTutorialSeeAlsoInclude:)