Areduino Ethernet  W5100网络扩展模块，可以使Areduino成为简单的Web服务器或者通过网络控制读写Areduino的数字和模拟接口等网络应用。可直接使用IDE中的Ethernet库文件便可实现一个简单Web服务器。

    同时该版本的支持mini SD卡（TF卡）读写

该扩展板采用了可堆叠的设计，可直接插到Areduino上，同时我们的其他扩展板也可以插上去。

代码：

/*
 * Web Server
 *
 * A simple web server that shows the value of the analog input pins.
 */

#include

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte ip[] =  { 192, 168, 0, 15 };

Server server(80);

void setup()
{
  Ethernet.begin(mac, ip);
  server.begin();
}

void loop()
{
  Client client = server.available();
  if (client) {
    // an http request ends with a blank line
    boolean current_line_is_blank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        // if we've gotten to the end of the line (received a newline
        // character) and the line is blank, the http request has ended,
        // so we can send a reply
        if (c == 'n' && current_line_is_blank) {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println();
        
          // output the value of each analog input pin
          client.print("welcome to tinyos");
          client.println("
");
          client.print("//*************************************");
          client.println("
");
          client.print(www.tinyos.net.cn);
          client.println("
");
          client.print("//*************************************");
          client.println("
");
          for (int i = 0; i < 6; i++) {
            client.print("analog input ");
            client.print(i);
            client.print(" is ");
            client.print(analogRead(i));
            client.println("
");
          }
          break;
        }
        if (c == 'n') {
          // we're starting a new line
          current_line_is_blank = true;
        } else if (c != 'r') {
          // we've gotten a character on the current line
          current_line_is_blank = false;
        }
      }
    }
    client.stop();
  }
}