Connecting Arduino boards to Wifi

*WORK IN PROGRESS.*

## Introduction

This guide will cover how to connect Arduino boards to WEP and WPA2 personal networks (Arduinos cannot connect to WPA2 Enterprise networks.) Connecting Arduinos into Wifi takes little time and only requires some basic knowledge on programming and networks.

### Network Vocabulary

Make sure you're familiar with some of these concepts:

***SSID*** - *Service Set Identifier:* An ID to identify a service set. (name of the wireless network.)

***WEP and WPA2 encryption***. - Types of wireless data encryption algorithms. Only know that these two are different and require a different set of programs for the Arduino to connect to. (Holistic knowledge of how these encryptions work is not needed.)

## WEP Connection Guide

Please read the following link to connect to a WEP network.

http://www.arduino.cc/en/Tutorial/ConnectWithWEP

Code only:

This code will connect an Arduino to a WEP-encrypted wireless network.

/\*

 This example connects to a WEP-encrypted Wifi network.
 Then it prints the  MAC address of the Wifi shield,
 the IP address obtained, and other network details.

 If you use 40-bit WEP, you need a key that is 10 characters long,
 and the characters must be hexadecimal (0-9 or A-F).
 e.g.  for 40-bit, ABBADEAF01 will work, but ABBADEAF won't work
 (too short) and ABBAISDEAF won't work (I and S are not
 hexadecimal characters).

 For 128-bit, you need a string that is 26 characters long.
 D0D0DEADF00DABBADEAFBEADED will work because it's 26 characters,
 all in the 0-9, A-F range.

 Circuit:
 \* WiFi shield attached

 created 13 July 2010
 by dlf (Metodo2 srl)
 modified 31 May 2012
 by Tom Igoe
 \*/
#include <WiFi.h>

char ssid[] = "yourNetwork";                     // your network SSID (name)
char key[] = "D0D0DEADF00DABBADEAFBEADED";       // your network key
int keyIndex = 0;                                // your network key Index number
int status = WL\_IDLE\_STATUS;                     // the Wifi radio's status

void setup() {
  //Initialize serial and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo 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);
  }

  // attempt to connect to Wifi network:
  while ( status != WL\_CONNECTED) {
    Serial.print("Attempting to connect to WEP network, SSID: ");
    Serial.println(ssid);
    status = WiFi.begin(ssid, keyIndex, key);

    // wait 10 seconds for connection:
    delay(10000);
  }

  // once you are connected :
  Serial.print("You're connected to the network");
  printCurrentNet();
  printWifiData();
}

void loop() {
  // check the network connection once every 10 seconds:
  delay(10000);
  printCurrentNet();
}

void printWifiData() {
  // print your WiFi shield's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);
  Serial.println(ip);

  // print your MAC address:
  byte mac[6];
  WiFi.macAddress(mac);
  Serial.print("MAC address: ");
  Serial.print(mac[5],HEX);
  Serial.print(":");
  Serial.print(mac[4],HEX);
  Serial.print(":");
  Serial.print(mac[3],HEX);
  Serial.print(":");
  Serial.print(mac[2],HEX);
  Serial.print(":");
  Serial.print(mac[1],HEX);
  Serial.print(":");
  Serial.println(mac[0],HEX);
}

void printCurrentNet() {
  // print the SSID of the network you're attached to:
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print the MAC address of the router you're attached to:
  byte bssid[6];
  WiFi.BSSID(bssid);
  Serial.print("BSSID: ");
  Serial.print(bssid[5],HEX);
  Serial.print(":");
  Serial.print(bssid[4],HEX);
  Serial.print(":");
  Serial.print(bssid[3],HEX);
  Serial.print(":");
  Serial.print(bssid[2],HEX);
  Serial.print(":");
  Serial.print(bssid[1],HEX);
  Serial.print(":");
  Serial.println(bssid[0],HEX);

  // print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.println(rssi);

  // print the encryption type:
  byte encryption = WiFi.encryptionType();
  Serial.print("Encryption Type:");
  Serial.println(encryption,HEX);
  Serial.println();
}

----------------------------------------------------------------END----------------------------------------------------------------------