You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
186 lines
7.6 KiB
HTML
186 lines
7.6 KiB
HTML
14 years ago
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
|
||
|
|
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
||
|
|
<html>
|
||
|
|
<head>
|
||
|
|
<title>Arduino - BooleanVariables </title>
|
||
|
|
<link rel="shortcut icon" type="image/x-icon" href="http://arduino.cc/en/favicon.png">
|
||
|
|
<link rel='stylesheet' href='arduinoUno.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; }
|
||
|
|
|
||
|
|
span.anchor {
|
||
|
|
float: left;
|
||
|
|
font-size: 10px;
|
||
|
|
margin-left: -10px;
|
||
|
|
width: 10px;
|
||
|
|
position:relative; top:-0.1em;
|
||
|
|
text-align: center;
|
||
|
|
}
|
||
|
|
span.anchor a { text-decoration: none; }
|
||
|
|
span.anchor a:hover { text-decoration: underline; }
|
||
|
|
ol.toc { text-indent:-20px; list-style: none; }
|
||
|
|
ol.toc ol.toc { text-indent:-40px; }
|
||
|
|
div.tocfloat { font-size: smaller; margin-bottom: 10px;
|
||
|
|
border-top: 1px dotted #555555; border-bottom: 1px dotted #555555;
|
||
|
|
padding-top: 5px; padding-bottom: 5px;
|
||
|
|
width: 38%; float: right; margin-left: 10px; clear: right;
|
||
|
|
margin-right:-13px; padding-right: 13px; padding-left: 13px;
|
||
|
|
background-color: #eeeeee; }
|
||
|
|
div.toc { font-size: smaller;
|
||
|
|
padding: 5px; border: 1px dotted #cccccc;
|
||
|
|
background: #f7f7f7;
|
||
|
|
margin-bottom: 10px; }
|
||
|
|
div.toc p { background-color: #f9f6d6;
|
||
|
|
margin-top:-5px; padding-top: 5px;
|
||
|
|
margin-left:-5px; padding-left: 5px;
|
||
|
|
margin-right:-5px; padding-right: 5px;
|
||
|
|
padding-bottom: 3px;
|
||
|
|
border-bottom: 1px dotted #cccccc; }.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><script type="text/javascript">
|
||
|
|
function toggle(obj) {
|
||
|
|
var elstyle = document.getElementById(obj).style;
|
||
|
|
var text = document.getElementById(obj + "tog");
|
||
|
|
if (elstyle.display == 'none') {
|
||
|
|
elstyle.display = 'block';
|
||
|
|
text.innerHTML = "hide";
|
||
|
|
} else {
|
||
|
|
elstyle.display = 'none';
|
||
|
|
text.innerHTML = "show";
|
||
|
|
}
|
||
|
|
}
|
||
|
|
</script> <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 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">
|
||
|
|
<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 id="navbar_external">
|
||
|
|
<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>
|
||
|
|
</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>boolean</h2>
|
||
|
|
<p>A <strong>boolean</strong> holds one of two values, <a class='wikilink' href='Constants.html'>true</a> or <a class='wikilink' href='Constants.html'>false</a>. (Each boolean variable occupies one byte of memory.)
|
||
|
|
</p>
|
||
|
|
<p class='vspace'></p><h4>Example</h4>
|
||
|
|
<pre>
|
||
|
|
int LEDpin = 5; // LED on pin 5
|
||
|
|
int switchPin = 13; // momentary switch on 13, other side connected to ground
|
||
|
|
|
||
|
|
boolean running = false;
|
||
|
|
|
||
|
|
void setup()
|
||
|
|
{
|
||
|
|
pinMode(LEDpin, OUTPUT);
|
||
|
|
pinMode(switchPin, INPUT);
|
||
|
|
digitalWrite(switchPin, HIGH); // turn on pullup resistor
|
||
|
|
}
|
||
|
|
|
||
|
|
void loop()
|
||
|
|
{
|
||
|
|
if (digitalRead(switchPin) == LOW)
|
||
|
|
{ // switch is pressed - pullup keeps pin high normally
|
||
|
|
delay(100); // delay to debounce switch
|
||
|
|
running = !running; // toggle running variable
|
||
|
|
digitalWrite(LEDpin, running) // indicate via LED
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</pre>
|
||
|
|
<p class='vspace'></p><h4>See also</h4>
|
||
|
|
<ul><li><a class='wikilink' href='Constants.html'>constants</a>
|
||
|
|
</li><li><a class='wikilink' href='Boolean.html'>boolean operators</a>
|
||
|
|
</li><li><a class='urllink' href='VariableDeclaration.html' rel='nofollow'>Variable Declaration</a>
|
||
|
|
</li></ul><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>
|
||
|
|
|
||
|
|
|
||
|
|
<!-- AddThis Button BEGIN -->
|
||
|
|
<script type="text/javascript">var addthis_language = "en";
|
||
|
|
</script>
|
||
|
|
<div class="addthis_container addthis_toolbox addthis_default_style" addthis:url="BooleanVariables" addthis:title="Arduino Wiki English">
|
||
|
|
<a href="http://www.addthis.com/bookmark.php?v=250&username=arduinoteam" class="addthis_button_compact">Share</a><span
|
||
|
|
class="addthis_separator">|</span><a class="addthis_button_email"></a><a class="addthis_button_favorites"></a><a class="addthis_button_print"></a><a
|
||
|
|
class="addthis_button_facebook"></a><a class="addthis_button_twitter"></a><script type="text/javascript"
|
||
|
|
src="http://s7.addthis.com/js/250/addthis_widget.js#username=arduinoteam"></script></div>
|
||
|
|
<!-- AddThis Button END -->
|
||
|
|
|
||
|
|
</div>
|
||
|
|
<!--PageFooterFmt-->
|
||
|
|
<div id="pagefooter">
|
||
|
|
©Arduino |
|
||
|
|
<a href=.html'#'>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>
|