<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>Arduino - Keywords </title> <link rel='stylesheet' href='arduino.css' type='text/css' /> </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://www.arduino.cc/en/Main/Buy'>Buy</a> | <a class='wikilink' href='http://www.arduino.cc/en/Main/Software'>Download</a> | <a class='wikilink' href='Guide_index.html'>Getting Started</a> | <a class='wikilink' href='http://www.arduino.cc/en/Tutorial/HomePage'>Learning</a> | <a class='wikilink' href='index.html'>Reference</a> | <a class='wikilink' href='http://www.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'> <p><strong>Reference</strong> <a class='wikilink' href='index.html'>Language</a> (<a class='wikilink' href='Extended.html'>extended</a>) | <a class='wikilink' href='Libraries.html'>Libraries</a> | <a class='wikilink' href='Comparison.html'>Comparison</a> | <a class='wikilink' href='Board.html'>Board</a> </p> <p class='vspace'></p><h2>Keywords</h2> <p>Keywords are constants, variables and function names that are defined as part of the Arduino language. Avoid using keywords for variable names. </p> <p class='vspace'></p> <table width='90%' border='0' cellpadding='5' cellspacing='0'><tr><td width='33%' valign='top'> <pre> # Constants HIGH LOW INPUT OUTPUT SERIAL DISPLAY PI HALF_PI TWO_PI LSBFIRST MSBFIRST CHANGE FALLING RISING false true null # Port Variables & Constants DDRB PINB PORTB PB0 PB1 PB2 PB3 PB4 PB5 PB6 PB7 DDRC PINC PORTC PC0 PC1 PC2 PC3 PC4 PC5 PC6 PC7 DDRD PIND PORTD PD0 PD1 PD2 PD3 PD4 PD5 PD6 PD7 # Datatypes boolean byte char class default do double int long </pre></td><td width='33%' valign='top'> <pre> private protected public return short signed static switch throw try unsigned void # Other abs acos += + [] asin = atan atan2 & | boolean byte case ceil char char class , // ?: constrain cos {} -- default delay delayMicroseconds / /** . else == exp false float float floor for < <= HALF_PI if ++ != int << < <= log && ! || </pre> <p class='vspace'></p></td><td width='33%' valign='top'> <p class='vspace'></p><pre> loop max millis min - % /* * new null () PI return >> ; Serial Setup sin sq sqrt -= switch tan this true TWO_PI void while Serial begin read print write println available digitalWrite digitalRead pinMode analogRead analogWrite attachInterrupts detachInterrupts beginSerial serialWrite serialRead serialAvailable printString printInteger printByte printHex printOctal printBinary printNewline pulseIn shiftOut </pre></td></tr></table> <p class='vspace'></p><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://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?board=swbugs' 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"> <a href='#'>Edit Page</a> | <a href='#'>Page History</a> | <a href='#' target='_blank'>Printable View</a> | <a href='http://www.arduino.cc/en/Site/AllRecentChanges'>All Recent Site Changes</a> </div> <!--/PageFooterFmt--> </div> </body> </html>