117 lines
5.6 KiB
HTML
117 lines
5.6 KiB
HTML
<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns:MadCap="http://www.madcapsoftware.com/Schemas/MadCap.xsd" MadCap:lastBlockDepth="6" MadCap:lastHeight="94" MadCap:lastWidth="853" MadCap:disableMasterStylesheet="true" MadCap:tocPath="" MadCap:InPreviewMode="false" MadCap:PreloadImages="false" MadCap:RuntimeFileType="Topic" MadCap:TargetType="WebHelp" lang="en-us" xml:lang="en-us" MadCap:PathToHelpSystem="../../../" MadCap:HelpSystemFileName="Default.xml" MadCap:SearchType="Stem">
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<head><title>PWM Examples</title>
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<link href="../../SkinSupport/MadCap.css" rel="stylesheet" />
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</head>
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<body>
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<h1>PWM Examples</h1>
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<div class="ImagePlusCaption">
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<div class="Col2">
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<p>
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<img src="../../graphics/pgm_icon1.gif" border="0" alt="BS1 icon" title="BS1 icon" />
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<img src="../../graphics/pgm_icon2.gif" border="0" alt="BS2 icon" title="BS2 icon" />
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<img src="../../graphics/pgm_icon2e.gif" border="0" alt="BS2e icon" title="BS2e icon" />
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<img src="../../graphics/pgm_icon2sx.gif" border="0" alt="BS2sx icon" title="BS2sx icon" />
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<img src="../../graphics/pgm_icon2p.gif" border="0" alt="BS2p icon" title="BS2p icon" />
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<img src="../../graphics/pgm_icon2pe.gif" border="0" alt="BS2pe icon" title="BS2pe icon" />
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<img src="../../graphics/pgm_icon2px.gif" border="0" alt="BS2px icon" title="BS2px icon" />
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</p>
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</div>
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<p style="text-align: right;">Sytnax: <a href="../Commands/PWM.htm" target="" title="" alt="" class="MCXref_0" xrefformat="{paratext}">PWM</a></p>
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<p> </p>
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</div>
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<p class="clear"> </p>
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<p> </p>
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<p class="PlainText" style="text-align: center;">
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<img src="../../graphics/pwm_sch.gif" />
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</p><pre class="BScode" xml:space="preserve">' PWM.BS1
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' Connect a voltmeter (such as a digital multimeter set to its voltage
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' range) to the output of the circuit shown in the figure for the PWM
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' command (in the manual). Run the program and observe the readings on
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' the meter. They should come very close to 1.96V, then decrease slightly
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' as the capacitor discharges. Try varying the interval between PWM bursts
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' (by changing the PAUSE value) and the number of PWM cycles to see their
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' effect.
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' {$STAMP BS1}
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' {$PBASIC 1.0}
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Main:
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PWM 0, 100, 10 ' PWM at 100/255 duty (~50 ms)
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PAUSE 1000 ' wait one second
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GOTO Main
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END
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</pre>
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<p class="PlainText"> </p>
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<p>NOTE: The example below is written for the BS2 and will run on any of the BS2-family modules. Modify the $STAMP directive (as required) before downloading to the BS2e, BS2sx, BS2p, BS2pe, or BS2px.</p><pre class="BScode" xml:space="preserve">' PWM.BS2
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' Connect a voltmeter (such as a digital multimeter set to its voltage
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' range) to the output of the circuit shown in the figure for the PWM
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' command (in the manual). Run the program and observe the readings on
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' the meter. They should come very close to 1.96V, then decrease slightly
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' as the capacitor discharges. Try varying the interval between PWM bursts
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' (by changing the PAUSE value) and the number of PWM cycles to see their
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' effect.
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' {$STAMP BS2p}
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' {$PBASIC 2.5}
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#SELECT $STAMP
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#CASE BS2, BS2E
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CycAdj CON $100 ' x 1.0, cycle ajustment (for ms)
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#CASE BS2SX
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CycAdj CON $280 ' x 2.5
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#CASE BS2P
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CycAdj CON $187 ' x 1.53
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#CASE BS2PE
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CycAdj CON $09E ' x 0.62
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#CASE BS2PX
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CycAdj CON $280 ' x 2.5
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#ENDSELECT
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Cycles CON 50
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Main:
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PWM 0, 100, (Cycles */ CycAdj) ' PWM at 100/255 duty (~50 ms)
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PAUSE 1000 ' wait one second
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GOTO Main
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END
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</pre>
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<div class="Col2">
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<div class="MasterFoot">
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<p MadCap:conditions="BSEconditions.BSEWebHelp (Primary)-INCLUDE"><a href="../../HomeTopics/HomePage.htm">Go to Welcome page</a>
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</p>
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<div class="Col2">
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<div class="MasterFoot">
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<p style="text-align: right;"><span class="ContactInfoProjectName">BASIC Stamp Help</span> <![CDATA[ ]]><span class="ContactInfoVersion#">Version 2.5.4</span> <![CDATA[ ]]></p>
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<p style="text-align: right;">Copyright © <span class="ContactInfoCompanyName">Parallax Inc.</span></p>
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<p style="text-align: right;"><span class="SystemShortDate">8/8/2012</span>
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</p>
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</div>
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