查看“Micro:bit系列教程12：使用Sound Sensor探测声音”的源代码



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


<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 style="font-size:16.0pt;line-height:150%;font-family:黑体;font-weight:normal;
mso-bidi-font-weight:bold">基本介绍

</h1>

    <span lang="EN-US" style="font-size:
12.0pt;line-height:150%;font-family:宋体">Sound Sensor模块采用了音频处理芯片LM386，可对音频信号进行200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(不能测量具体的分贝数)。


<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 style="font-size:16.0pt;line-height:150%;font-family:黑体;font-weight:normal;
mso-bidi-font-weight:bold">硬件连接

</h1>

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


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Micro:bit


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Sound Sensor


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VCC


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VCC


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GND


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GND


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  none;mso-border-top-alt:solid windowtext .5pt;mso-border-alt:solid windowtext .5pt;
  padding:0cm 5.4pt 0cm 5.4pt" width="277">

P0


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AOUT


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P1


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DOUT


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<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：




[[File:140431pk4kzks4xun5cz55.jpg]]

<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 style="font-size:16.0pt;line-height:150%;font-family:黑体;font-weight:normal;
mso-bidi-font-weight:bold">软件设计

</h1>

    <span style="font-size:12.0pt;
line-height:150%;font-family:宋体">打开makecode，添加软件包，输入以下链接：




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



<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：




[[File:140432g3ttkgxbxc254z42.png]]


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




[[File:140433de9pz28gls9ex28v.png]]


由图中数据可知，对Sound Sensor喊话，其输出的ADC值将明显变大，声音越大，其输出的ADC值及其对应的输出电压越大。