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234 lines
9.3 KiB
HTML
234 lines
9.3 KiB
HTML
14 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html>
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<head>
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<title>Arduino - Print </title>
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<link rel="shortcut icon" type="image/x-icon" href="http://arduino.cc/en/favicon.png">
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<link rel='stylesheet' href='arduinoUno.css' type='text/css' />
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ul, ol, pre, dl, p { margin-top:0px; margin-bottom:0px; }
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span.anchor {
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float: left;
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font-size: 10px;
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width: 10px;
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text-align: center;
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ol.toc ol.toc { text-indent:-40px; }
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border-top: 1px dotted #555555; border-bottom: 1px dotted #555555;
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width: 38%; float: right; margin-left: 10px; clear: right;
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background-color: #eeeeee; }
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div.toc { font-size: smaller;
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padding: 5px; border: 1px dotted #cccccc;
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background: #f7f7f7;
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margin-bottom: 10px; }
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div.toc p { background-color: #f9f6d6;
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margin-top:-5px; padding-top: 5px;
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margin-left:-5px; padding-left: 5px;
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margin-right:-5px; padding-right: 5px;
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padding-bottom: 3px;
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border-bottom: 1px dotted #cccccc; }.editconflict { color:green;
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font-style:italic; margin-top:1.33em; margin-bottom:1.33em; }
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table.markup { border: 2px dotted #ccf; width:90%; }
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td.markup1, td.markup2 { padding-left:10px; padding-right:10px; }
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td.markup1 { border-bottom: 1px solid #ccf; }
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div.faq { margin-left:2em; }
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div.faq p.question { margin: 1em 0 0.75em -2em; font-weight:bold; }
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div.faq hr { margin-left: -2em; }
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{ border:1px solid #cccccc; padding:4px; background-color:#f9f9f9; }
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a.varlink { text-decoration:none; }
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--></style><script type="text/javascript">
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function toggle(obj) {
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var elstyle = document.getElementById(obj).style;
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if (elstyle.display == 'none') {
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text.innerHTML = "hide";
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} else {
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elstyle.display = 'none';
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text.innerHTML = "show";
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<body>
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<div id="page">
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<div class="title"><a href='http://arduino.cc/en'>Arduino</a></div>
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<div class="search">
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<input type=hidden name=ie value=UTF-8>
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<input type=hidden name=oe value=UTF-8>
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<INPUT TYPE=text name=q size=25 maxlength=255 value="">
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<INPUT type=submit name=btnG VALUE="search">
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<input type=hidden name=domains value="http://www.arduino.cc/">
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<input type=hidden name=sitesearch value="http://www.arduino.cc/">
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</FORM>
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<!-- SiteSearch Google -->
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</div>
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</div>
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<!--PageLeftFmt-->
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<div id="pagenav">
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<div id="navbar">
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<p><a class='wikilink' href='http://arduino.cc/en/Main/Buy'>Buy</a>
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<a class='wikilink' href='http://arduino.cc/en/Main/Software'>Download</a>
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<a class='wikilink' href='Guide_index.html'>Getting Started</a>
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<a class='wikilink' href='http://arduino.cc/en/Tutorial/HomePage'>Learning</a>
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<a class='wikilink' href='index.html'>Reference</a>
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<a class='wikilink' href='http://arduino.cc/en/Main/Hardware'>Hardware</a>
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<a class='wikilink' href='FAQ.html'>FAQ</a>
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</p>
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<p class='vspace'></p>
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</div>
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<div id="navbar_external">
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<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>
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</div>
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</div>
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<!--/PageLeftFmt-->
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<div id="pagetext">
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<!--PageText-->
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<div id='wikitext'>
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<p><a class='wikilink' href='Serial.html'>Serial</a>
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</p>
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<p class='vspace'></p><h2>print()</h2>
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<h4>Description</h4>
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<p>Prints data to the serial port as human-readable ASCII text. This command can take many forms. Numbers are printed using an ASCII character for each digit. Floats are similarly printed as ASCII digits, defaulting to two decimal places. Bytes are sent as a single character. Characters and strings are sent as is. For example:
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</p><ul><li>Serial.print(78) gives "78"
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</li><li>Serial.print(1.23456) gives "1.23"
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</li><li>Serial.print(byte(78)) gives "N" (whose ASCII value is 78)
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</li><li>Serial.print('N') gives "N"
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</li><li>Serial.print("Hello world.") gives "Hello world."
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</li></ul><p class='vspace'></p><p>An optional second parameter specifies the base (format) to use; permitted values are BYTE, BIN (binary, or base 2), OCT (octal, or base 8), DEC (decimal, or base 10), HEX (hexadecimal, or base 16). For floating point numbers, this parameter specifies the number of decimal places to use. For example:
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</p><ul><li>Serial.print(78, BYTE) gives "N"
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</li><li>Serial.print(78, BIN) gives "1001110"
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</li><li>Serial.print(78, OCT) gives "116"
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</li><li>Serial.print(78, DEC) gives "78"
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</li><li>Serial.print(78, HEX) gives "4E"
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</li><li>Serial.println(1.23456, 0) gives "1"
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</li><li>Serial.println(1.23456, 2) gives "1.23"
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</li><li>Serial.println(1.23456, 4) gives "1.2346"
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</li></ul><p class='vspace'></p><h4>Syntax</h4>
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<p>Serial.print(val) <br />Serial.print(val, format)
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</p>
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<p class='vspace'></p><h4>Parameters</h4>
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<p>val: the value to print - any data type
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</p>
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<p class='vspace'></p><p>format: specifies the number base (for integral data types) or number of decimal places (for floating point types)
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</p>
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<p class='vspace'></p><h4>Returns</h4>
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<p>None
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</p>
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<p class='vspace'></p><h4>Example:</h4>
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<pre>/*
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Uses a FOR loop for data and prints a number in various formats.
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*/
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int x = 0; // variable
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void setup() {
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Serial.begin(9600); // open the serial port at 9600 bps:
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}
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void loop() {
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// print labels
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Serial.print("NO FORMAT"); // prints a label
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Serial.print("\t"); // prints a tab
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Serial.print("DEC");
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Serial.print("\t");
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Serial.print("HEX");
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Serial.print("\t");
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Serial.print("OCT");
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Serial.print("\t");
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Serial.print("BIN");
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Serial.print("\t");
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Serial.println("BYTE");
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for(x=0; x< 64; x++){ // only part of the ASCII chart, change to suit
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// print it out in many formats:
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Serial.print(x); // print as an ASCII-encoded decimal - same as "DEC"
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Serial.print("\t"); // prints a tab
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Serial.print(x, DEC); // print as an ASCII-encoded decimal
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Serial.print("\t"); // prints a tab
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Serial.print(x, HEX); // print as an ASCII-encoded hexadecimal
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Serial.print("\t"); // prints a tab
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Serial.print(x, OCT); // print as an ASCII-encoded octal
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Serial.print("\t"); // prints a tab
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Serial.print(x, BIN); // print as an ASCII-encoded binary
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Serial.print("\t"); // prints a tab
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Serial.println(x, BYTE); // prints as a raw byte value,
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// then adds the carriage return with "println"
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delay(200); // delay 200 milliseconds
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}
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Serial.println(""); // prints another carriage return
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}
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</pre>
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<p class='vspace'></p><h4>Programming Tips / Known Issues</h4>
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<p>The last character to be printed is transmitted over the serial port after Serial.print() has returned.
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</p>
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<p class='vspace'></p><h4>See also</h4>
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<ul><li><a class='wikilink' href='Serial_Write.html'>Serial.write</a>()
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</li><li><a class='wikilink' href='Serial_Println.html'>Serial.println</a>()
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</li></ul><p class='vspace'></p><p><a class='wikilink' href='index.html'>Reference Home</a>
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</p>
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</div>
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©Arduino |
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<a href=.html'Serial_Print?action=edit.html'>Edit Page</a> | <a href='Serial_Print?action=diff.html'>Page History</a> | <a href='Serial_Print?action=print.html' target='_blank'>Printable View</a> | <a href='http://arduino.cc/en/Site/AllRecentChanges'>All Recent Site Changes</a>
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