<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>Arduino Reference - Ethernet </title> <link rel="shortcut icon" type="image/x-icon" href="http://arduino.cc/en/favicon.png"> <link rel='stylesheet' href='arduinoWideRender.css' type='text/css' /> <!--HeaderText--><style type='text/css'><!-- ul, ol, pre, dl, p { margin-top:0px; margin-bottom:0px; } code { white-space: nowrap; } .vspace { margin-top:1.33em; } .indent { margin-left:40px; } .outdent { margin-left:40px; text-indent:-40px; } a.createlinktext { text-decoration:none; border-bottom:1px dotted gray; } a.createlink { text-decoration:none; position:relative; top:-0.5em; font-weight:bold; font-size:smaller; border-bottom:none; } img { border:0px; } .editconflict { color:green; font-style:italic; margin-top:1.33em; margin-bottom:1.33em; } table.markup { border: 2px dotted #ccf; width:90%; } td.markup1, td.markup2 { padding-left:10px; padding-right:10px; } td.markup1 { border-bottom: 1px solid #ccf; } div.faq { margin-left:2em; } div.faq p.question { margin: 1em 0 0.75em -2em; font-weight:bold; } div.faq hr { margin-left: -2em; } .frame { border:1px solid #cccccc; padding:4px; background-color:#f9f9f9; } .lfloat { float:left; margin-right:0.5em; } .rfloat { float:right; margin-left:0.5em; } a.varlink { text-decoration:none; } --></style> <meta name='robots' content='index,follow' /> <meta name="verify-v1" content="TtxFIEJAB6zdJ509wLxjnapQzKAMNm9u0Wj4ho6wxIY=" /> </head> <body> <div id="page"> <!--PageHeaderFmt--> <div id="pageheader"> <div class="title"><a href='http://arduino.cc/en'>Arduino</a></div> </div> <!--/PageHeaderFmt--> <!--PageLeftFmt--> <div id="pagenav"> <div id="navbar"> <p><a class='wikilink' href='http://arduino.cc/en/Main/Buy'>Buy</a> <a class='wikilink' href='http://arduino.cc/en/Main/Software'>Download</a> <a class='wikilink' href='Guide_index.html'>Getting Started</a> <a class='wikilink' href='http://arduino.cc/en/Tutorial/HomePage'>Learning</a> <a class='wikilink' href='index.html'>Reference</a> <a class='wikilink' href='http://arduino.cc/en/Main/Hardware'>Hardware</a> <a class='wikilink' href='FAQ.html'>FAQ</a> </p> <p class='vspace'></p> </div> </div> <!--/PageLeftFmt--> <div id="pagetext"> <!--PageText--> <div id='wikitext'> <p><strong>Reference</strong> <a class='wikilink' href='index.html'>Language</a> | <a class='wikilink' href='Libraries.html'>Libraries</a> | <a class='wikilink' href='Comparison.html'>Comparison</a> | <a class='wikilink' href='Changes.html'>Changes</a> </p> <p class='vspace'></p><h2>Ethernet library</h2> <p>With the Arduino Ethernet Shield, this library allows an Arduino board to connect to the internet. It can serve as either a server accepting incoming connections or a client making outgoing ones. The library supports up to four concurrent connection (incoming or outgoing or a combination). </p> <p class='vspace'></p><p>Arduino communicates with the shield using the SPI bus. This is on digital pins 11, 12, and 13 on the Uno and pins 50, 51, and 52 on the Mega. <strong>On both boards, pin 10 is used as SS.</strong> On the Mega, the hardware SS pin, 53, is not used to select the W5100, but it must be kept as an output or the SPI interface won't work. </p> <p class='vspace'></p><div><img src='http://arduino.cc/en/uploads/Reference/arduino_uno_ethernet_pins.png' alt='' title='' /></div> <p class='vspace'></p><div><img src='http://arduino.cc/en/uploads/Reference/arduino_mega_ethernet_pins.png' alt='' title='' /></div> <p class='vspace'></p><h4>Ethernet class</h4> <p>The Ethernet class initializes the ethernet library and network settings. </p> <p class='vspace'></p><ul><li><a class='wikilink' href='EthernetBegin.html'>begin()</a> </li><li><a class='wikilink' href='EthernetLocalIP.html'>localIP()</a> </li></ul><p class='vspace'></p><h4><span class='wikiword'>IPAddress</span> class</h4> <p>The <span class='wikiword'>IPAddress</span> class works with local and remote IP addressing. </p> <p class='vspace'></p><ul><li><a class='wikilink' href='EthernetIPAddress.html'>IPAddress()</a> </li></ul><p class='vspace'></p><h4>Server class</h4> <p>The Server class creates servers which can send data to and receive data from connected clients (programs running on other computers or devices). </p> <p class='vspace'></p><ul><li><a class='wikilink' href='ServerConstructor.html'>Server</a> <p class='vspace'></p></li><li><a class='wikilink' href='EthernetServer.html'>EthernetServer()</a> </li><li><a class='wikilink' href='ServerBegin.html'>begin()</a> </li><li><a class='wikilink' href='ServerAvailable.html'>available()</a> </li><li><a class='wikilink' href='ServerWrite.html'>write()</a> </li><li><a class='wikilink' href='ServerPrint.html'>print()</a> </li><li><a class='wikilink' href='ServerPrintln.html'>println()</a> </li></ul><p class='vspace'></p><h4>Client class</h4> <p>The client class creates clients that can connect to servers and send and receive data. </p> <p class='vspace'></p><ul><li><a class='wikilink' href='ClientConstructor.html'>Client</a> <p class='vspace'></p></li><li><a class='wikilink' href='EthernetClient.html'>EthernetClient()</a> </li><li><a class='wikilink' href='ClientConnected.html'>connected()</a> </li><li><a class='wikilink' href='ClientConnect.html'>connect()</a> </li><li><a class='wikilink' href='ClientWrite.html'>write()</a> </li><li><a class='wikilink' href='ClientPrint.html'>print()</a> </li><li><a class='wikilink' href='ClientPrintln.html'>println()</a> </li><li><a class='wikilink' href='ClientAvailable.html'>available()</a> </li><li><a class='wikilink' href='ClientRead.html'>read()</a> </li><li><a class='wikilink' href='ClientFlush.html'>flush()</a> </li><li><a class='wikilink' href='ClientStop.html'>stop()</a> </li></ul><p class='vspace'></p><h4><span class='wikiword'>EthernetUDP</span> class</h4> <p>The <span class='wikiword'>EthernetUDP</span> class enables UDP message to be sent and received. </p> <p class='vspace'></p><ul><li><a class='wikilink' href='EthernetUDPBegin.html'>begin()</a> </li><li><a class='wikilink' href='EthernetUDPRead.html'>read()</a> </li><li><a class='wikilink' href='EthernetUDPWrite.html'>write()</a> </li><li><a class='wikilink' href='EthernetUDPBeginPacket.html'>beginPacket()</a> </li><li><a class='wikilink' href='EthernetUDPEndPacket.html'>endPacket()</a> </li><li><a class='wikilink' href='EthernetUDPParsePacket.html'>parsePacket()</a> </li><li><a class='wikilink' href='EthernetUDPAvailable.html'>available()</a> </li><li><a class='wikilink' href='EthernetUDPRemoteIP.html'>remoteIP()</a> </li><li><a class='wikilink' href='EthernetUDPRemotePort.html'>remotePort()</a> </li></ul><p><a class='wikilink' href='index.html'>Reference Home</a> </p> <p class='vspace'></p><p><em>Corrections, suggestions, and new documentation should be posted to the <a class='urllink' href='http://arduino.cc/forum/index.php/board,23.0.html' rel='nofollow'>Forum</a>.</em> </p> <p class='vspace'></p><p>The text of the Arduino reference is licensed under a <a class='urllink' href='http://creativecommons.org/licenses/by-sa/3.0/' rel='nofollow'>Creative Commons Attribution-ShareAlike 3.0 License</a>. Code samples in the reference are released into the public domain. </p> </div> </div> <!--PageFooterFmt--> <div id="pagefooter"> ©Arduino | <a href='#'>Edit Page</a> | <a href='#'>Page History</a> | <a href='#' target='_blank'>Printable View</a> | <a href='http://arduino.cc/en/Site/AllRecentChanges'>All Recent Site Changes</a> </div> <!--/PageFooterFmt--> </div> </body> </html>