<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>Arduino - Begin </title> <link rel='stylesheet' href='arduino.css' type='text/css' /> <meta name="verify-v1" content="TtxFIEJAB6zdJ509wLxjnapQzKAMNm9u0Wj4ho6wxIY=" /> </head> <body> <div id="page"> <!--PageHeaderFmt--> <div id="pageheader"> <div class="title"><a href="http://www.arduino.cc"/>Arduino</a></div> <div class="search"> <!-- SiteSearch Google --> <FORM method=GET action="http://www.google.com/search"> <input type=hidden name=ie value=UTF-8> <input type=hidden name=oe value=UTF-8> <INPUT TYPE=text name=q size=25 maxlength=255 value=""> <INPUT type=submit name=btnG VALUE="search"> <input type=hidden name=domains value="http://www.arduino.cc/"> <input type=hidden name=sitesearch value="http://www.arduino.cc/"> </FORM> <!-- SiteSearch Google --> </div> </div> <!--/PageHeaderFmt--> <!--PageLeftFmt--> <div id="pagenav" style="text-align: right"> <div style="float: left;"> <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> <a class="urllink" href="http://www.arduino.cc/blog/" rel="nofollow">Blog »</a> | <a class="urllink" href="http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl" rel="nofollow">Forum »</a> | <a class="urllink" href="http://www.arduino.cc/playground/" rel="nofollow">Playground »</a> </div> <!--/PageLeftFmt--> <div id="pagetext"> <!--PageText--> <div id='wikitext'> <h2>Serial.begin(int speed)</h2> <h4>Description</h4> <p>Sets the data rate in bits per second (baud) for serial data transmission. For communicating with the computer, use one of these rates: 300, 1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, or 115200. You can, however, specify other rates - for example, to communicate over pins 0 and 1 with a component that requires a particular baud rate. </p> <p class='vspace'></p><h4>Parameters</h4> <p>long <strong>datarate</strong>, in bits per second (baud) </p> <p class='vspace'></p><h4>Returns</h4> <p>nothing </p> <p class='vspace'></p><h3>Example:</h3> <pre> void setup() { Serial.begin(9600); // opens serial port, sets data rate to 9600 bps } void loop() {} </pre> <p class='vspace'></p><p><strong>Arduino Mega example:</strong> </p> <p class='vspace'></p><pre> // Arduino Mega using all four of its Serial ports // (Serial, Serial1, Serial2, Serial3), // with different baud rates: void setup(){ Serial.begin(9600); Serial1.begin(38400); Serial2.begin(19200); Serial3.begin(4800); Serial.println("Hello Computer"); Serial1.println("Hello Serial 1"); Serial2.println("Hello Serial 2"); Serial3.println("Hello Serial 3"); } void loop() {} </pre> <p class='vspace'></p><p><em>Thanks to Jeff Gray for the mega example</em> </p> <p class='vspace'></p><h4>See also</h4> <ul><li><a class='wikilink' href='Serial_Available.html'>Serial.available</a>() </li><li><a class='wikilink' href='Serial_Read.html'>Serial.read</a>() </li><li><a class='wikilink' href='Serial_Print.html'>Serial.print</a>(data) </li><li><a class='wikilink' href='Serial_Println.html'>Serial.println</a>(data) </li></ul><p class='vspace'></p><p><a class='wikilink' href='index.html'>Reference Home</a> </p> </div> </div> <!--PageFooterFmt--> <div id="pagefooter"> <a href='Serial_Begin?action=edit.html'>Edit Page</a> | <a href='Serial_Begin?action=diff.html'>Page History</a> | <a href='Serial_Begin?action=print.html' target='_blank'>Printable View</a> | <a href='http://arduino.cc/en/Site/AllRecentChanges'>All Recent Site Changes</a> </div> <!--/PageFooterFmt--> </div> </body> </html>