查看“Micro:bit系列教程20：BME280 Environmental Sensor检测环境气压/温度/湿度 ... ... ...”的源代码



<span style="font-size:12.0pt;
line-height:150%;font-family:宋体">本章将介绍Micro:bit通过BME280传感器模块获取环境气压，温度，湿度的方法。


<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

</h1>

<span lang="EN-US" style="font-size:
12.0pt;line-height:150%;font-family:宋体">  BME280
Environmental Sensor<span style="font-size:12.0pt;line-height:150%;
font-family:宋体">是一款环境传感器模块，可感知环境温度、湿度和大气压强，Micro:bit可通过I2C接口与该模块连接，进而获取气压，温度，湿度等相关数据。


<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，Micro:bit与BME280 Environmental Sensor的连接方式如下：




[[File:142740lbqbc1kgva1g4aak.png]]


<span lang="EN-US" style="font-size:
12.0pt;line-height:150%;font-family:宋体">  实际中，Micro:bit采用I2C接口与该模块连接，具体连接如下表所示：


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Micro:bit


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BME280
  Environmental Sensor


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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">

VCC


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  mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
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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">

SCL


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SCL


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SDA


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SDA


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</tbody></table>
<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">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 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:142741brp5xj87e5xl28va.png]]


下载程序，点击显示数据(设备)按钮，将显示温度，湿度，气压等变化曲线数据，如下图所示:




[[File:142742qff63aytt0tt67ye.png]]


在该实验中，用温水杯先靠近BME280模块，然后将温水杯移开，观察数据变化曲线如图所示，符合预期，并且，大气压数据在1标准大气压(1013.25hPa)附近变化,符合实际情况。