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Ethernet Shield Programming

Step 3: Programming the Arduino
Code:

/*
  Web Server

 A simple web server that shows the static webpage.
 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)
 */

#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);

String HTTP_req;          // stores the HTTP request
boolean LED_status = 0;   // state of LED, off by default

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
     pinMode(13, OUTPUT);       // LED on pin 2    
  }


  // 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();
        HTTP_req += c;  //Save the HTTP request 1 char at a time
//        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>");
                    client.println("<head>");
                    client.println("<title>Arduino Web Server</title>");
                    client.println("</head>");
                    client.println("<style>");
                    client.println("table {");
                    client.println("    width:70%;");
                    client.println("}");
                    client.println("table, th, td {");
                    client.println("    border: 1px solid black;");
                    client.println("    border-collapse: collapse;");
                    client.println("}");
                    client.println("th, td {");
                    client.println("    padding: 5px;");
                    client.println("    text-align: left;");
                    client.println("}");
                    client.println("table#t01 tr:nth-child(even) {");
                    client.println("    background-color: #eee;");
                    client.println("}");
                    client.println("table#t01 tr:nth-child(odd) {");
                    client.println("   background-color:#fff;");
                    client.println("}");
                    client.println("table#t01 th {");
                    client.println("    background-color: #00A8A9;");
                    client.println("    color: white;");
                    client.println("}");
                    client.println("</style>");
                    client.println("</head>");
                    client.println("<body>");                    
                    client.println("<br>");
                    client.println("<H1><center>blog.circuits4you.com Static web page demo</center></h1>");
                    client.println("<center>");
                    client.println("<table id=""t01"">");
                    client.println("  <tr>");
                    client.println("    <th>First Name</th>");
                    client.println("    <th>Last Name</th>");
                    client.println("    <th>Points</th>");
                    client.println("  </tr>");
                    client.println("  <tr>");
                    client.println("    <td>Jill</td>");
                    client.println("    <td>Smith</td> ");
                    client.println("    <td>50</td>");
                    client.println("  </tr>");
                    client.println("  <tr>");
                    client.println("    <td>Eve</td>");
                    client.println("    <td>Jackson</td>");
                    client.println("    <td>94</td>");
                    client.println("  </tr>");
                    client.println("  <tr>");
                    client.println("    <td>John</td>");
                    client.println("    <td>Doe</td>");  
                    client.println("    <td>80</td>");
                    client.println("  </tr>");
                    client.println("</table>");
                    client.println("</center>");          
                    client.println("</body>");
                    client.println("</html>");
          Serial.print(HTTP_req);
          HTTP_req = "";  //finishehed with request, empty string
          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 disconnected");
  }
}

// switch LED and send back HTML for LED checkbox
void ProcessCheckbox(EthernetClient cl)
{
    if (HTTP_req.indexOf("LED2=2") > -1) {  // see if checkbox was clicked
        // the checkbox was clicked, toggle the LED
        if (LED_status) {
            LED_status = 0;
        }
        else {
            LED_status = 1;
        }
    }
    
    if (LED_status) {    // switch LED on
        digitalWrite(13, HIGH);
        // checkbox is checked
        cl.println("<input type=\"checkbox\" name=\"LED2\" value=\"2\" \
        onclick=\"submit();\" checked>LED2");
    }
    else {              // switch LED off
        digitalWrite(13, LOW);
        // checkbox is unchecked
        cl.println("<input type=\"checkbox\" name=\"LED2\" value=\"2\" \
        onclick=\"submit();\">LED2");
    }
}

Load the above code in arduino


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