Arduino库教程-WIfi无线扩展块101-WiFi Web Client

WiFi Web Client

• 这个例子展示了如何用一个 WiFi Shield 101 或者 一个 MKR1000开发板来制作一个HTTP请求。它对术语“Arduino”返回一个谷歌搜索。这个搜索结果可通过你的Arduino软件（IDE）串口窗口作为 HTML 被查看。

• 这个例子是为一个使用WPA加密的网络编写的。对于WEP或WPA，相应地改变Wifi.begin()的调用。

硬件要求

• Arduino WiFi Shield 101
• Arduino or Genuino Zero board
  或者
• MKR1000

电路

• 数字引脚7被用来作为WiFi Shield 101 和 开发板的握手引脚使用，而不应该被占用。

• 这个例子里你应该进入一个连接到互联网的802.11b/g无线网络。你需要改变程序里的网络设置来符合您的特定网络SSID。

• 对于使用WPA/WPA2个人加密的网络，你需要的SSID和密码。扩展块将无法通过WPA2企业加密连接到网络。

• WEP网络密码进制字符串作为键。一个WEP网络可以有4种不同的钥匙；每个按键都分配了一个“关键指标”的价值。WEP加密的网络，你需要SSID，key，和key number。

图由 Fritzing 绘制
在上图，Arduino 或 Genuino Zero 开发板应该在堆叠在 WiFi shield上面。

样例代码

/*
  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 <SPI.h>
#include <WiFi101.h>

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);
  }

  // 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");
}

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更多

• WiFi library – WiFi101 库的参考网页

• WiFi Shield – WiFi 扩展板 101 的产品细节

• MKR1000 – MKR1000 板的产品细节

• Connect No Encryption: 演示如何连接到一个开放的网络。

• Connect With WEP: 演示如何连接到用WEP加密的网络。

• Connect With WPA: 演示如何连接到一个用WPA2个人加密网络。

• Scan Networks:显示出所有在范围内的无线网络。

• Simple Web Server WiFi: 通过打开和关闭一个LED来访问这个简单的Web服务器

• UDP NTP Client: 通过UDP查询网络时间协议（NTP）服务器。

• WiFi Chat Server: 建立一个简单的聊天服务器。

• WiFi Web Client: 连接到一个远程服务器。

• WiFi Web Client Repeating: 反复做HTTP请求到服务器。

• WiFi Web Server: 通过模拟输入值来服务一个来自WIfi无线扩展块的网页。

• WiFi Send Receive UDP String: 发送和接收UDP字符串。