This Ethernet Shield which is based on the Wiznet W5100 Ethernet Chip gives you an easy way to get your for Arduino Online. It is directly supported by for Arduino official Ethernet Library. It adds a micro-SD card slot, which can be used to store files for serving over the network. It is compatible with the for Arduino Duemilanove (168 or 328), Uno as well as Mega (1280/2560) and can be accessed using the SD library.

The Wiznet W5100 provides a network (IP) stack capable of both TCP and UDP. It supports up to four simultaneous socket connections. Use the Ethernet library to write sketches which connect to the internet using the shield.

Test Code:

/*

* 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();

}

}

The shield contains a number of informational LEDs:

PWR: indicates that the board and shield are powered

LINK: indicates the presence of a network link and flashes when the shield transmits or receives data

FULLD: indicates that the network connection is full duplex

100M: indicates the presence of a 100 Mb/s network connection (as opposed to 10 Mb/s)

RX: flashes when the shield receives data

TX: flashes when the shield sends data

COLL: flashes when network collisions are detected Compatibility

Working with: Arduino Uno, Arduino Mega, Arduino Duemilanove.