查看“Micro:bit系列教程21：UV Sensor”的源代码


本章将介绍Micro:bit采用UV Sensor检测紫外线的相对强度。


<h1 style="line-height:150%"><span lang="EN-US" style="font-size:15.0pt;
line-height:150%;font-family:黑体;font-weight:normal;mso-bidi-font-weight:bold">1.<span style="font-size:15.0pt;line-height:150%;font-family:黑体;font-weight:normal;
mso-bidi-font-weight:bold">基本介绍

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<span lang="EN-US" style="font-size:
12.0pt;line-height:150%;font-family:宋体">    UV
Sensor模块使用的紫外线传感器是GUVA，它是一个测试紫外线总量的较好器件，不需要使用波长滤波器，只对紫外线敏感。这些传感器在大约 365nm(UV-A)和320nm(UV-B)有很好的响应截止性能，因此不需要滤波器。


<h1 style="line-height:150%"><span lang="EN-US" style="font-size:15.0pt;
line-height:150%;font-family:黑体;font-weight:normal;mso-bidi-font-weight:bold">2.<span style="font-size:15.0pt;line-height:150%;font-family:黑体;font-weight:normal;
mso-bidi-font-weight:bold">硬件连接

</h1>

<span lang="EN-US" style="font-size:
12.0pt;line-height:150%;font-family:宋体">    在硬件上，采用Micro:bit的P0引脚来获取UV Sensor模拟输出的大小，进行AD转换，并转换成电压，从而得到数字信号。


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Micro:bit


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UV 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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P0


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AOUT


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<span style="font-size:12.0pt;
line-height:150%;font-family:宋体">具体硬件连接图如下图所示：




[[File:184502l70xkgzbv2vakcvz.jpg]]

<h1 style="line-height:150%"><span lang="EN-US" style="font-size:15.0pt;
line-height:150%;font-family:黑体;font-weight:normal;mso-bidi-font-weight:bold">3.<span style="font-size:15.0pt;line-height:150%;font-family:黑体;font-weight:normal;
mso-bidi-font-weight:bold">软件设计

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<span lang="EN-US" 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:184503vnh9dgdh50x72ms7.png]]


<span style="font-size:12.0pt;
line-height:150%;font-family:宋体">下载，等下载成功后，点击显示数据(设备)，可观测Micro:bit读取UV Sensor的ADC值，以及转换后的电压：




[[File:184503z3lypl24jlywzjaw.png]]

<span lang="EN-US" style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:
"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-ansi-language:EN-US;
mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA'>    <span style='font-size:12.0pt;font-family:宋体;mso-bidi-font-family:
"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-ansi-language:EN-US;
mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA'>由图中数据可知，当采用验钞机紫外线，或将UV Sensor暴露于阳光下时，UV Sensor输出的ADC值将明显增大，相应地，其输出电压也明显增大。