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

WiFi Web Server

  • 在这个例子中，您将使用WiFi Shield 101 和 Arduino 或者 Genuino Zero, 或者MKR1000开发板，来创建一个简单的Web服务器。使用WiFi的函数库，你的设备将能够回答来自WiFi连接收到一个HTTP请求。打开浏览器并导航到您的WiFi扩展块或MKR1000的IP地址后，你的开发板响应足够的HTML，浏览器会显示所有六个模拟引脚的输入值。

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

请输入图片描述
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

/*
  WiFi Web Server

 A simple web server that shows the value of the analog input pins.
 using a WiFi shield.

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

 Circuit:
 * WiFi shield attached
 * Analog inputs attached to pins A0 through A5 (optional)

 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
int keyIndex = 0;                 // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;

WiFiServer server(80);

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);
  }
  server.begin();
  // you're connected now, so print out the status:
  printWifiStatus();
}


void loop() {
  // listen for incoming clients
  WiFiClient client = server.available();
  if (client) {
    Serial.println("new client");
    // an http request ends with a blank line
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        Serial.write(c);
        // if you've gotten to the end of the line (received a newline
        // character) and the line is blank, the http request has ended,
        // so you can send a reply
        if (c == '\n' && currentLineIsBlank) {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println("Connection: close");  // the connection will be closed after completion of the response
          client.println("Refresh: 5");  // refresh the page automatically every 5 sec
          client.println();
          client.println("<!DOCTYPE HTML>");
          client.println("<html>");
          // output the value of each analog input pin
          for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
            int sensorReading = analogRead(analogChannel);
            client.print("analog input ");
            client.print(analogChannel);
            client.print(" is ");
            client.print(sensorReading);
            client.println("<br />");
          }
          client.println("</html>");
          break;
        }
        if (c == '\n') {
          // you're starting a new line
          currentLineIsBlank = true;
        }
        else if (c != '\r') {
          // you've gotten a character on the current line
          currentLineIsBlank = false;
        }
      }
    }
    // give the web browser time to receive the data
    delay(1);

    // close the connection:
    client.stop();
    Serial.println("client disonnected");
  }
}


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();
  Seria

l.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");
}

[Get Code]
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。

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