WiFi Web Client

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1/*
2
3  Web client
4
5 This sketch connects to a website (http://www.google.com)
6
7 using a WiFi shield.
8
9 This example is written for a network using WPA encryption. For
10
11 WEP or WPA, change the Wifi.begin() call accordingly.
12
13 This example is written for a network using WPA encryption. For
14
15 WEP or WPA, change the Wifi.begin() call accordingly.
16
17 Circuit:
18
19 * WiFi shield attached
20
21 created 13 July 2010
22
23 by dlf (Metodo2 srl)
24
25 modified 31 May 2012
26
27 by Tom Igoe
28
29 */
30
31#include <SPI.h>
32#include <WiFi.h>
33
34char ssid[] = "yourNetwork"; //  your network SSID (name)
35char pass[] = "secretPassword";    // your network password (use for WPA, or use as key for WEP)
36int keyIndex = 0;            // your network key Index number (needed only for WEP)
37
38int status = WL_IDLE_STATUS;
39// if you don't want to use DNS (and reduce your sketch size)
40// use the numeric IP instead of the name for the server:
41//IPAddress server(74,125,232,128);  // numeric IP for Google (no DNS)
42char server[] = "www.google.com";    // name address for Google (using DNS)
43
44// Initialize the Ethernet client library
45// with the IP address and port of the server
46// that you want to connect to (port 80 is default for HTTP):
47
48WiFiClient client;
49
50void setup() {
51
52  //Initialize serial and wait for port to open:
53
54  Serial.begin(9600);
55
56  while (!Serial) {
57
58    ; // wait for serial port to connect. Needed for native USB port only
59
60  }
61
62  // check for the presence of the shield:
63
64  if (WiFi.status() == WL_NO_SHIELD) {
65
66    Serial.println("WiFi shield not present");
67
68    // don't continue:
69
70    while (true);
71
72  }
73
74  String fv = WiFi.firmwareVersion();
75
76  if (fv != "1.1.0") {
77
78    Serial.println("Please upgrade the firmware");
79
80  }
81
82  // attempt to connect to Wifi network:
83
84  while (status != WL_CONNECTED) {
85
86    Serial.print("Attempting to connect to SSID: ");
87
88    Serial.println(ssid);
89
90    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
91
92    status = WiFi.begin(ssid, pass);
93
94    // wait 10 seconds for connection:
95
96    delay(10000);
97
98  }
99
100  Serial.println("Connected to wifi");
101
102  printWifiStatus();
103
104  Serial.println("\nStarting connection to server...");
105
106  // if you get a connection, report back via serial:
107
108  if (client.connect(server, 80)) {
109
110    Serial.println("connected to server");
111
112    // Make a HTTP request:
113
114    client.println("GET /search?q=arduino HTTP/1.1");
115
116    client.println("Host: www.google.com");
117
118    client.println("Connection: close");
119
120    client.println();
121
122  }
123}
124
125void loop() {
126
127  // if there are incoming bytes available
128
129  // from the server, read them and print them:
130
131  while (client.available()) {
132
133    char c = client.read();
134
135    Serial.write(c);
136
137  }
138
139  // if the server's disconnected, stop the client:
140
141  if (!client.connected()) {
142
143    Serial.println();
144
145    Serial.println("disconnecting from server.");
146
147    client.stop();
148
149    // do nothing forevermore:
150
151    while (true);
152
153  }
154}
155
156void printWifiStatus() {
157
158  // print the SSID of the network you're attached to:
159
160  Serial.print("SSID: ");
161
162  Serial.println(WiFi.SSID());
163
164  // print your WiFi shield's IP address:
165
166  IPAddress ip = WiFi.localIP();
167
168  Serial.print("IP Address: ");
169
170  Serial.println(ip);
171
172  // print the received signal strength:
173
174  long rssi = WiFi.RSSI();
175
176  Serial.print("signal strength (RSSI):");
177
178  Serial.print(rssi);
179
180  Serial.println(" dBm");
181}