hl23889909 发表于 2022-4-17 09:03

【GD32L233C-START评测】五 简易温湿度显示器

本帖最后由 hl23889909 于 2022-4-17 09:03 编辑

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<p style="margin-left:28px; text-indent:.6pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">本demo需要的硬件:GD32L233C-START评估板,OLED显示屏,AHT25温湿度传感器:</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">SPI接口OLED显示屏</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">IIC接口AHT25温湿度传感器</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">主要实现功能:通过OLED显示屏,采集到的温湿度数据实时显示,读取RTC时间显示,低功耗休眠,按键按下显示1秒钟,不按一直处于休眠状态。</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">OLED显示单元能自动发光,无需背光,有多种驱动接口方式,我这里选择的是SPI接口的,接口定义及接上对应板子的GPIO上:</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">GND:电源地&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span lang="EN-US" style="font-family:Wingdings">&agrave;</span>GND</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">VCC:电源正3~5V&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span lang="EN-US" style="font-family:Wingdings">&agrave;</span>3.3V</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">D0:SPI时钟线CLK &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span lang="EN-US" style="font-family:Wingdings">&agrave;</span>PB13</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">D1:SPI数据线MOSI&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span lang="EN-US" style="font-family:Wingdings">&agrave;</span>PB15</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">RES:复位&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span lang="EN-US" style="font-family:Wingdings">&agrave;</span>PB1</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">DC:SPI数据/命令选择&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span lang="EN-US" style="font-family:Wingdings">&agrave;</span>PB0</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">CS:SPI片选、低电平有效 <span lang="EN-US" style="font-family:Wingdings">&agrave;</span>PB12</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">SPI点屏接口:</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">OLE的初始化:</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">PS:这里我选择SPI接口,目的是想测试下这个单片机的SPI接口的,但是我调了两个晚上,集成SPI就是点不亮,配置各个参数,时间关系,最后换成了模拟SPI方式~尴尬!</span></span></p>

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<ul><br />
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        <li style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">温湿度传感器驱动</span></span></li>
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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">为了测试方便我买了个AHT25集成式温湿度传感器,I2C接口,看的时候以为是2.54排针,我用杜邦线接到开发板就好,回来才发现它是那么的迷你,1.0的排针,然后自己手动焊线出来,接口定义及接上对应板子的GPIO上:</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">1,VDD:电源正(2.2-5.5V)&nbsp; <span lang="EN-US" style="font-family:Wingdings">&agrave;</span>3.3V</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">2,SDA:串行数据&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span lang="EN-US" style="font-family:Wingdings">&agrave;</span>PB11</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">3,GND:电源地&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span lang="EN-US" style="font-family:Wingdings">&agrave;</span>GND</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">4,SCL:串行时钟&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span lang="EN-US" style="font-family:Wingdings">&agrave;</span>PB10</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">I2C读写函数:</span></span></p>

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<p style="margin-left:28px; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">AHT25读取转换结果接口:</span></span></p>

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<p style="margin-left:1px; text-align:justify; text-indent:21pt"><span style="font-size:10.5pt"><span style="font-family:等线">时间显示,需要在第一次上电需要配置RTC时间,写入标志,只要后备电不断,每次进入待机模式,唤醒重启,都无需在重新配置,由于评测板子用户按键比较少,所以这里通过串口来配置初始时间,实际使用可以自己加按键操作。</span></span></p>

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<p style="margin-left:1px; text-align:justify; text-indent:21pt"><span style="font-size:10.5pt"><span style="font-family:等线">每次通过按键唤醒,间隔500毫秒采集一次数据并显示,共采集2次,然后进入休眠,做到需要观看才显示,不看时一直保持着低功耗的状态,单片机功耗怎么低一节小电池都可以工作很长时间。</span></span></p>

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<p style="margin-left:1px; text-align:justify; text-indent:21pt"><span style="font-size:10.5pt"><span style="font-family:等线">唤醒显示内容:标题,时间,温度,湿度。</span></span></p>

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<p style="margin-left:1px; text-align:justify; text-indent:21pt"><span style="font-size:10.5pt"><span style="font-family:等线">用杜邦线对应IO接好线后:</span></span></p>

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<p style="margin-left:1px; text-align:justify; text-indent:21pt"><span style="font-size:10.5pt"><span style="font-family:等线">完整测试视频:</span></span></p>

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<p style="margin-left:1px; text-align:justify; text-indent:21pt"><iframe allowfullscreen="true" frameborder="0" height="510" src="https://training.eeworld.com.cn/shareOpenCourseAPI?isauto=true&amp;lessonid=33120" style="background:#eee;margin-bottom:10px;" width="700"></iframe><br />
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<p style="text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线"><b>注意:第一次上电需要先设置RTC时间,才会继续执行,设置后不断电无需在设置。</b></span></span></p>

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<p style="text-indent:21.0pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">本demo利用GD32L233单片机,自带外设功能,完成一个简易温湿度采集显示器,重点是利用低功耗功能实现应用。</span></span></p>

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<p style="text-indent:21.0pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">当然这只是一个简单的应用,针对特定应用场景,比如农业大棚温室中应用,方便用户查看当前温湿度情况及时间等,平时不用需要时候才看一下,按需工作显示,早上观察一次,下午观察一次,或者定时观察等,然后只能电池供电方便,这就需要用到低功耗产品,本单片机的待机功耗是完全能够满足的。</span></span></p>

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<p style="text-indent:21.0pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">实际使用中大家可以根据情况发挥,例如可以加定时记录功能,通过串口或者其他工具,可以方便导出数据,供环境数据分析,也可以加一些温湿度超阈值报警提示等功能。</span></span></p>

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<p style="text-indent:21.0pt; text-align:justify"><span style="font-size:10.5pt"><span style="font-family:等线">最后上传测试代码,需放到及替换标准固件库目录下文件夹</span></span><br />
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lugl4313820 发表于 2022-4-17 09:59

<p>做得很成功了,spi 硬件没有成功,有没有用逻辑分析仪,或者示波器抓一下时序图列?</p>
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