Arduino wifi web interface

WiFi Web Server

In this example, you will use your WiFi Shield and your Arduino board to create a simple Web server. Using the WiFi library, your device will be able to answer a HTTP request with your WiFI shield. After opening a browser and navigating to your WiFi shield’s IP address, your board will respond with just enough HTML for a browser to display the input values from all six analog pins.

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

Hardware Required

• Arduino WiFi Shield
• Shield-compatible Arduino board
• (optional) Six analog sensors attached to Analog Pins 0-5

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 chip 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.

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

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

Warning

This example doesn’t require an SD card. If an SD card is inserted but not used, it is possible for the sketch to hang, because pin 4 is used as SS (active low) of the SD and when not used it is configured as INPUT by default. Two possible solutions:

Copy
1pinMode(4, OUTPUT); 
2 digitalWrite(4, HIGH);

Code

Copy
1/*
2 
3 WiFi Web Server
4 
5 A simple web server that shows the value of the analog input pins.
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 Circuit:
14 
15 * WiFi shield attached
16 
17 * Analog inputs attached to pins A0 through A5 (optional)
18 
19 created 13 July 2010
20 
21 by dlf (Metodo2 srl)
22 
23 modified 31 May 2012
24 
25 by Tom Igoe
26 
27 */ 
28 
29 #include 
30 #include 
31 
32char ssid[] = "yourNetwork"; // your network SSID (name) 
33char pass[] = "secretPassword"; // your network password 
34 int keyIndex = 0; // your network key Index number (needed only for WEP) 
35 
36 int status = WL_IDLE_STATUS; 
37 
38 WiFiServer server(80); 
39 
40 void setup()  
41 
42 //Initialize serial and wait for port to open: 
43 
44 Serial.begin(9600); 
45 
46 while (!Serial)  
47 
48 ; // wait for serial port to connect. Needed for native USB port only 
49 
50 > 
51 
52 // check for the presence of the shield: 
53 
54 if (WiFi.status() == WL_NO_SHIELD)  
55 
56 Serial.println("WiFi shield not present"); 
57 
58 // don't continue: 
59 
60 while (true); 
61 
62 > 
63 
64 String fv = WiFi.firmwareVersion(); 
65 
66 if (fv != "1.1.0")  
67 
68 Serial.println("Please upgrade the firmware"); 
69 
70 > 
71 
72 // attempt to connect to Wifi network: 
73 
74 while (status != WL_CONNECTED)  
75 
76 Serial.print("Attempting to connect to SSID: "); 
77 
78 Serial.println(ssid); 
79 
80 // Connect to WPA/WPA2 network. Change this line if using open or WEP network: 
81 
82 status = WiFi.begin(ssid, pass); 
83 
84 // wait 10 seconds for connection: 
85 
86 delay(10000); 
87 
88 > 
89 
90 server.begin(); 
91 
92 // you're connected now, so print out the status: 
93 
94 printWifiStatus(); 
95 > 
96 
97 void loop()  
98 
99 // listen for incoming clients 
100 
101 WiFiClient client = server.available(); 
102 
103 if (client)  
104 
105 Serial.println("new client"); 
106 
107 // an http request ends with a blank line 
108 
109 bool currentLineIsBlank = true; 
110 
111 while (client.connected())  
112 
113 if (client.available())  
114 
115 char c = client.read(); 
116 
117 Serial.write(c); 
118 
119 // if you've gotten to the end of the line (received a newline 
120 
121 // character) and the line is blank, the http request has ended, 
122 
123 // so you can send a reply 
124 
125 if (c == '\n' && currentLineIsBlank)  
126 
127 // send a standard http response header 
128 
129 client.println("HTTP/1.1 200 OK"); 
130 
131 client.println("Content-Type: text/html"); 
132 
133 client.println("Connection: close"); // the connection will be closed after completion of the response 
134 
135 client.println("Refresh: 5"); // refresh the page automatically every 5 sec 
136 
137 client.println(); 
138 
139 client.println(""); 
140 
141 client.println(""); 
142 
143 // output the value of each analog input pin 
144 
145 for (int analogChannel = 0; analogChannel  6; analogChannel++)  
146 
147 int sensorReading = analogRead(analogChannel); 
148 
149 client.print("analog input "); 
150 
151 client.print(analogChannel); 
152 
153 client.print(" is "); 
154 
155 client.print(sensorReading); 
156 
157 client.println("
"); 
158 
159 > 
160 
161 client.println(""); 
162 
163 break; 
164 
165 > 
166 
167 if (c == '\n')  
168 
169 // you're starting a new line 
170 
171 currentLineIsBlank = true; 
172 
173 > else if (c != '\r')  
174 
175 // you've gotten a character on the current line 
176 
177 currentLineIsBlank = false; 
178 
179 > 
180 
181 > 
182 
183 > 
184 
185 // give the web browser time to receive the data 
186 
187 delay(1); 
188 
189 // close the connection: 
190 
191 client.stop(); 
192 
193 Serial.println("client disconnected"); 
194 
195 > 
196 > 
197 
198 void printWifiStatus()  
199 
200 // print the SSID of the network you're attached to: 
201 
202 Serial.print("SSID: "); 
203 
204 Serial.println(WiFi.SSID()); 
205 
206 // print your WiFi shield's IP address: 
207 
208 IPAddress ip = WiFi.localIP(); 
209 
210 Serial.print("IP Address: "); 
211 
212 Serial.println(ip); 
213 
214 // print the received signal strength: 
215 
216 long rssi = WiFi.RSSI(); 
217 
218 Serial.print("signal strength (RSSI):"); 
219 
220 Serial.print(rssi); 
221 
222 Serial.println(" dBm"); 
223 >

Last revision 2018/08/23 by SM

Источник

WiFi Web Client

This example shows you how to make a HTTP request using a WiFi shield. It returns a Google search for the term «Arduino». The results of this search are viewable as HTML through your Arduino Software (IDE) serial window.

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

Hardware Required

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.

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

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

Code

 /* 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 #include 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"); >

See Also:

• WiFi library — Your reference for the WiFi Library.
• WiFi Shield — Product details for the retired WiFi Shield.
• Getting started — Getting started with the retired WiFi Shield.
• Connect No Encryption — Demonstrates how to connect to an open network.
• Connect With WEP — Demonstrates how to connect to a network that is encrypted with WEP.
• Connect With WPA — Demonstrates how to connect to a network that is encrypted with WPA2 Personal.
• Scan Networks — Displays all WiFi networks in range.
• Simple Web Server WiFi — Turn on and off an LED accessing this simple Web Server.
• UDP NTP Client — Query a Network Time Protocol (NTP) server using UDP.
• WiFi Chat Server — Set up a simple chat server.
• WiFi Web Client Repeating — Repeatedly make HTTP calls to a server.
• WiFi Web Server — Serve a webpage from the WiFi shield with Analog Input values.
• WiFi Send Receive UDP String — Send and receive a UDP string.

Last revision 2018/08/23 by SM

Источник