Simple Web Server WiFi

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1/*
2  WiFi Web Server LED Blink
3
4 A simple web server that lets you blink an LED via the web.
5 This sketch will print the IP address of your WiFi Shield (once connected)
6 to the Serial monitor. From there, you can open that address in a web browser
7 to turn on and off the LED on pin 9.
8
9 If the IP address of your shield is yourAddress:
10 http://yourAddress/H turns the LED on
11 http://yourAddress/L turns it off
12
13 This example is written for a network using WPA encryption. For
14 WEP or WPA, change the Wifi.begin() call accordingly.
15
16 Circuit:
17 * WiFi shield attached
18 * LED attached to pin 9
19
20 created 25 Nov 2012
21 by Tom Igoe
22 */
23#include <SPI.h>
24#include <WiFi.h>
25
26char ssid[] = "yourNetwork";      //  your network SSID (name)
27char pass[] = "secretPassword";   // your network password
28int keyIndex = 0;                 // your network key Index number (needed only for WEP)
29
30int status = WL_IDLE_STATUS;
31WiFiServer server(80);
32
33void setup() {
34  Serial.begin(9600);      // initialize serial communication
35  pinMode(9, OUTPUT);      // set the LED pin mode
36
37  // check for the presence of the shield:
38  if (WiFi.status() == WL_NO_SHIELD) {
39    Serial.println("WiFi shield not present");
40    while (true);       // don't continue
41  }
42
43  String fv = WiFi.firmwareVersion();
44  if (fv != "1.1.0") {
45    Serial.println("Please upgrade the firmware");
46  }
47
48  // attempt to connect to Wifi network:
49  while (status != WL_CONNECTED) {
50    Serial.print("Attempting to connect to Network named: ");
51    Serial.println(ssid);                   // print the network name (SSID);
52
53    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
54    status = WiFi.begin(ssid, pass);
55    // wait 10 seconds for connection:
56    delay(10000);
57  }
58  server.begin();                           // start the web server on port 80
59  printWifiStatus();                        // you're connected now, so print out the status
60}
61
62
63void loop() {
64  WiFiClient client = server.available();   // listen for incoming clients
65
66  if (client) {                             // if you get a client,
67    Serial.println("new client");           // print a message out the serial port
68    String currentLine = "";                // make a String to hold incoming data from the client
69    while (client.connected()) {            // loop while the client's connected
70      if (client.available()) {             // if there's bytes to read from the client,
71        char c = client.read();             // read a byte, then
72        Serial.write(c);                    // print it out the serial monitor
73        if (c == '\n') {                    // if the byte is a newline character
74
75          // if the current line is blank, you got two newline characters in a row.
76          // that's the end of the client HTTP request, so send a response:
77          if (currentLine.length() == 0) {
78            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
79            // and a content-type so the client knows what's coming, then a blank line:
80            client.println("HTTP/1.1 200 OK");
81            client.println("Content-type:text/html");
82            client.println();
83
84            // the content of the HTTP response follows the header:
85            client.print("Click <a href=\"/H\">here</a> turn the LED on pin 9 on<br>");
86            client.print("Click <a href=\"/L\">here</a> turn the LED on pin 9 off<br>");
87
88            // The HTTP response ends with another blank line:
89            client.println();
90            // break out of the while loop:
91            break;
92          } else {    // if you got a newline, then clear currentLine:
93            currentLine = "";
94          }
95        } else if (c != '\r') {  // if you got anything else but a carriage return character,
96          currentLine += c;      // add it to the end of the currentLine
97        }
98
99        // Check to see if the client request was "GET /H" or "GET /L":
100        if (currentLine.endsWith("GET /H")) {
101          digitalWrite(9, HIGH);               // GET /H turns the LED on
102        }
103        if (currentLine.endsWith("GET /L")) {
104          digitalWrite(9, LOW);                // GET /L turns the LED off
105        }
106      }
107    }
108    // close the connection:
109    client.stop();
110    Serial.println("client disconnected");
111  }
112}
113
114void printWifiStatus() {
115  // print the SSID of the network you're attached to:
116  Serial.print("SSID: ");
117  Serial.println(WiFi.SSID());
118
119  // print your WiFi shield's IP address:
120  IPAddress ip = WiFi.localIP();
121  Serial.print("IP Address: ");
122  Serial.println(ip);
123
124  // print the received signal strength:
125  long rssi = WiFi.RSSI();
126  Serial.print("signal strength (RSSI):");
127  Serial.print(rssi);
128  Serial.println(" dBm");
129  // print where to go in a browser:
130  Serial.print("To see this page in action, open a browser to http://");
131  Serial.println(ip);
132}