Arduino网络服务器硬件及源代码

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我们在利用Arduino开发网络服务器的时候，会用到以太网Shield。在其中加入以太网库后，你的设备将能够通过以太网Shield应答HTTP的请求。在打开浏览器并确认你的以太网Shield的IP地址后，你的Arduino将会用足够的HTML来应答浏览器，并让浏览器显示六个模拟针脚的输入值。

需要的硬件

· Arduino 以太网 Shield

· 兼容Shield的 Arduino板

Circuit电路

以太网shield能让我们的Arduino通过SPI总线连接到一个WIZnet以太网控制器。以太网shield利用第10、11、12、13针脚来连接WIZnet的SPI。以太网shield的新产品在开发板上含有一个SD卡。数字针脚4是用来控制SD卡上面的slave select针脚。

以太网shield应当连接到一个具有以太网线的网络。你需要在程序中更改网络设置来和网络进行通信。

Arduino会被放置在以太网shield下面

示意图

源代码

/*
Web Server

A simple web server that shows the value of the analog input pins.
using an Arduino Wiznet Ethernet shield.

Circuit:
* Ethernet shield attached to pins 10, 11, 12, 13
* Analog inputs attached to pins A0 through A5 (optional)

created 18 Dec 2009
by David A. Mellis
modified 20 Mar 2012
by Tom Igoe

*/

#include <SPI.h>
#include <Ethernet.h>

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192,168,1, 177);

// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);

void setup() {
  Serial.begin(9600);
  // start the Ethernet connection and the server:
Ethernet.begin(mac, ip);
server.begin();
  Serial.print("server is at ");
  Serial.println(Ethernet.localIP());
}

void loop() {
  // listen for incoming clients
EthernetClient 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("Connnection: close");
client.println();
client.println("<!DOCTYPE HTML>");
client.println("<html>");
  // add a meta refresh tag, so the browser pulls again every 5 seconds:
client.println("<meta http-equiv=\"refresh\" content=\"5\">");
  // 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");
  }
}

英文详细内容请参考：http://arduino.cc/en/Tutorial/WebServer

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