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KevinOConnor
2023-11-17 03:08:49 +00:00
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Using_PWM_Tools.html
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How does it work?
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<a href="#current-limitations" class="md-nav__link">
Current Limitations
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How does it work?
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Current Limitations
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<h1 id="using-pwm-tools">Using PWM tools<a class="headerlink" href="#using-pwm-tools" title="Permanent link">&para;</a></h1>
<p>This document describes how to setup a PWM-controlled laser or spindle
using <code>output_pin</code> and some macros.</p>
using <code>pwm_tool</code> and some macros.</p>
<h2 id="how-does-it-work">How does it work?<a class="headerlink" href="#how-does-it-work" title="Permanent link">&para;</a></h2>
<p>With re-purposing the printhead's fan pwm output, you can control
lasers or spindles.
@@ -1396,12 +1382,6 @@ and to disconnect the laser when it is not needed.
Also, you should configure a safety timeout,
so that when your host or MCU encounters an error, the tool will stop.</p>
<p>For an example configuration, see <a href="/config/sample-pwm-tool.cfg">config/sample-pwm-tool.cfg</a>.</p>
<h2 id="current-limitations">Current Limitations<a class="headerlink" href="#current-limitations" title="Permanent link">&para;</a></h2>
<p>There is a limitation of how frequent PWM updates may occur.
While being very precise, a PWM update may only occur every 0.1 seconds,
rendering it almost useless for raster engraving.
However, there exists an <a href="https://github.com/Cirromulus/klipper/tree/laser_tool">experimental branch</a> with its own tradeoffs.
In long term, it is planned to add this functionality to main-line klipper.</p>
<h2 id="commands">Commands<a class="headerlink" href="#commands" title="Permanent link">&para;</a></h2>
<p><code>M3/M4 S&lt;value&gt;</code> : Set PWM duty-cycle. Values between 0 and 255.
<code>M5</code> : Stop PWM output to shutdown value.</p>