查看“Micro:bit系列教程12：Sound Sensor”的源代码

<p class="MsoNormal" style="line-height:150%"><span style="font-size:12.0pt;
line-height:150%;font-family:宋体">本章将介绍通过<span lang="EN-US">Sound Sensor （声音传感器）</span>进行声音探测<span lang="EN-US"></span></span></p>

<h1 style="line-height:150%"><span lang="EN-US" style="font-size:16.0pt;
line-height:150%;font-family:黑体;font-weight:normal;mso-bidi-font-weight:bold">1.</span><span style="font-size:16.0pt;line-height:150%;font-family:黑体;font-weight:normal;
mso-bidi-font-weight:bold">基本介绍<span lang="EN-US"></span></span></h1>

<p class="MsoNormal" style="line-height:150%"><span lang="EN-US"><span style="mso-tab-count:1">&nbsp;&nbsp;&nbsp; </span></span><span lang="EN-US" style="font-size:
12.0pt;line-height:150%;font-family:宋体">Sound Sensor</span><span style="font-size:12.0pt;line-height:150%;font-family:宋体">模块采用了音频处理芯片<span lang="EN-US">LM386</span>，可对音频信号进行<span lang="EN-US">200</span>倍放大，可用于检测环境声音的有无或判断声音强度的大小<span lang="EN-US">(</span>不能测量具体的分贝数<span lang="EN-US">)</span>。<span lang="EN-US"></span></span></p>

<h1 style="line-height:150%"><span lang="EN-US" style="font-size:16.0pt;
line-height:150%;font-family:黑体;font-weight:normal;mso-bidi-font-weight:bold">2.</span><span style="font-size:16.0pt;line-height:150%;font-family:黑体;font-weight:normal;
mso-bidi-font-weight:bold">硬件连接<span lang="EN-US"></span></span></h1>

<p class="MsoNormal" style="line-height:150%"><span lang="EN-US"><span style="mso-tab-count:1">&nbsp;&nbsp;&nbsp; </span></span><span style="font-size:12.0pt;
line-height:150%;font-family:宋体">在硬件连接上，采用<span lang="EN-US">Micro:bit</span>的<span lang="EN-US">P0</span>引脚来获取<span lang="EN-US">Sound Sensor</span>模拟信号的大小，并进行<span lang="EN-US">AD</span>转换，从而得到数字信号，采用<span lang="EN-US">Micro:bit</span>的<span lang="EN-US">P1</span>引脚来读取数字量输出，判断有无噪音。<span lang="EN-US"></span></span></p>

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  <td width="277" style="width:207.4pt;border:solid windowtext 1.0pt;mso-border-alt:
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  <p class="MsoNormal" align="center" style="text-align:center;line-height:150%"><span lang="EN-US" style="font-size:12.0pt;line-height:150%;font-family:宋体">Micro:bit</span></p>
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  <td width="277" style="width:207.4pt;border:solid windowtext 1.0pt;border-left:
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  <p class="MsoNormal" align="center" style="text-align:center;line-height:150%"><span lang="EN-US" style="font-size:12.0pt;line-height:150%;font-family:宋体">Sound Sensor</span></p>
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  <td width="277" style="width:207.4pt;border:solid windowtext 1.0pt;border-top:
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  <p class="MsoNormal" align="center" style="text-align:center;line-height:150%"><span lang="EN-US" style="font-size:12.0pt;line-height:150%;font-family:宋体">VCC</span></p>
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  border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;
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  mso-border-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt">
  <p class="MsoNormal" align="center" style="text-align:center;line-height:150%"><span lang="EN-US" style="font-size:12.0pt;line-height:150%;font-family:宋体">VCC</span></p>
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  <p class="MsoNormal" align="center" style="text-align:center;line-height:150%"><span lang="EN-US" style="font-size:12.0pt;line-height:150%;font-family:宋体">GND</span></p>
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  <p class="MsoNormal" align="center" style="text-align:center;line-height:150%"><span lang="EN-US" style="font-size:12.0pt;line-height:150%;font-family:宋体">GND</span></p>
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 <tr style="mso-yfti-irow:3">
  <td width="277" style="width:207.4pt;border:solid windowtext 1.0pt;border-top:
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  <p class="MsoNormal" align="center" style="text-align:center;line-height:150%"><span lang="EN-US" style="font-size:12.0pt;line-height:150%;font-family:宋体">P0</span></p>
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  <td width="277" style="width:207.4pt;border-top:none;border-left:none;
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  <p class="MsoNormal" align="center" style="text-align:center;line-height:150%"><span lang="EN-US" style="font-size:12.0pt;line-height:150%;font-family:宋体">AOUT</span></p>
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 <tr style="mso-yfti-irow:4;mso-yfti-lastrow:yes">
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  <p class="MsoNormal" align="center" style="text-align:center;line-height:150%"><span lang="EN-US" style="font-size:12.0pt;line-height:150%;font-family:宋体">P1</span></p>
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  <td width="277" style="width:207.4pt;border-top:none;border-left:none;
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  <p class="MsoNormal" align="center" style="text-align:center;line-height:150%"><span lang="EN-US" style="font-size:12.0pt;line-height:150%;font-family:宋体">DOUT</span></p>
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<p class="MsoNormal" style="line-height:150%"><span style="font-size:12.0pt;
line-height:150%;font-family:宋体">具体的硬件连接图如下所示：<span lang="EN-US"></span></span></p>

<p>[[File:Micro_bit系列教程12：Sound Sensor-1.jpg|400px]]</p>

<h1 style="line-height:150%"><span lang="EN-US" style="font-size:16.0pt;
line-height:150%;font-family:黑体;font-weight:normal;mso-bidi-font-weight:bold">3.</span><span style="font-size:16.0pt;line-height:150%;font-family:黑体;font-weight:normal;
mso-bidi-font-weight:bold">软件设计<span lang="EN-US"></span></span></h1>

<p class="MsoNormal" style="line-height:150%"><span lang="EN-US"><span style="mso-tab-count:1">&nbsp;&nbsp;&nbsp; </span></span><span style="font-size:12.0pt;
line-height:150%;font-family:宋体">打开<span lang="EN-US">makecode</span>，添加软件包，输入以下链接：<span lang="EN-US"></span></span></p>

<p class="MsoNormal" style="line-height:150%"><span lang="EN-US"><span style="font-size:12.0pt;
line-height:150%;font-family:宋体">https://github.com/waveshare/CourseKit</span></span><span class="MsoHyperlink"><span lang="EN-US" style="font-size:12.0pt;line-height:150%;
font-family:宋体"></span></span></p>

<p class="MsoNormal" style="line-height:150%"><span style="font-size:12.0pt;
line-height:150%;font-family:宋体">添加软件包成功后，采用积木块编写以下程序：<span lang="EN-US"></span></span></p>

<p>[[File:Micro_bit系列教程12：Sound Sensor-2.png|400px]]</p>

<p class="MsoNormal" style="line-height:150%"><span style="font-size:12.0pt;
line-height:150%;font-family:宋体">下载，点击显示数据<span lang="EN-US">(</span>设备<span lang="EN-US">),</span>可观测<span lang="EN-US">Micro:bit</span>读取<span lang="EN-US">Sound
Sensor</span>模块的<span lang="EN-US">ADC</span>值<span lang="EN-US">:</span></span></p>

<p>[[File:Micro_bit系列教程12：Sound Sensor-3.png|400px]]</p>

<p class="MsoNormal" style="text-indent:21.0pt;line-height:150%"><span style="font-size:12.0pt;line-height:150%;font-family:宋体">由图中数据可知，对<span lang="EN-US">Sound Sensor</span>喊话，其输出的<span lang="EN-US">ADC</span>值将明显变大，声音越大，其输出的<span lang="EN-US">ADC</span>值及其对应的输出电压越大。<span lang="EN-US"></span></span></p>