【树莓派Pico测评】 WS2812B全彩LED灯带/环的显示驱动
本帖最后由 jinglixixi 于 2021-3-26 00:32 编辑<p align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="background:white"><span style="line-height:24.0pt"><span style="font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:8.5pt"><span style="background:white"><span style="font-family:"微软雅黑","sans-serif""><span style="color:#444444"><span style="letter-spacing:.6pt">WS2812B</span></span></span></span></span><span style="font-size:8.5pt"><span style="background:white"><span style="font-family:"微软雅黑","sans-serif""><span style="color:#444444"><span style="letter-spacing:.6pt">全彩LED灯带/环是将多个5050贴片型RGB_LED置于灯带/环上，并内置IC芯片WS2812B来进行数据的传导及控制，其供电电压为5V。</span></span></span></span></span></span></span></span></span></p>
<p align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="background:white"><span style="line-height:24.0pt"><span style="font-family:Calibri,sans-serif"><span style="font-size:8.5pt"><span style="background:white"><span style="font-family:"微软雅黑","sans-serif""><span style="color:#444444"><span style="letter-spacing:.6pt">该灯带/环采用单总线工作，从而能大大地减轻控制器的I/O口压力。由于每个显示单元的Dout可以同另一个显示单元的Din进行级联使用，故不用考虑形状的限制。</span></span></span></span></span></span></span></span></span></p>
<p align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="background:white"><span style="line-height:24.0pt"><span style="font-family:Calibri,sans-serif"><span style="font-size:8.5pt"><span style="background:white"><span style="font-family:"微软雅黑","sans-serif""><span style="color:#444444"><span style="letter-spacing:.6pt">使用树莓派开发板能作为该灯带/环的控制器来使用，其程序及显示效果图1和图2所示。</span></span></span></span></span></span></span></span></span></p>
<p align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="background:white"><span style="line-height:24.0pt"><span style="font-family:Calibri,sans-serif"><span style="font-size:8.5pt"><span style="background:white"><span style="font-family:"微软雅黑","sans-serif""><span style="color:#444444"><span style="letter-spacing:.6pt">开发板控制灯带的输出引脚为GPIO22，并如下语句来设置显示单元的数量：</span></span></span></span></span></span></span></span></span></p>
<p align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="background:white"><span style="line-height:24.0pt"><span style="font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:8.5pt"><span style="background:white"><span style="font-family:"微软雅黑","sans-serif""><span style="color:#444444"><span style="letter-spacing:.6pt">NUM_LEDS = 8</span></span></span></span></span></span></span></span></span></p>
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<p align="left" style="text-align:left"><span style="font-size:10.5pt"><span style="background:white"><span style="line-height:24.0pt"><span style="font-family:Calibri,sans-serif"><span style="font-size:8.5pt"><span style="background:white"><span style="font-family:"微软雅黑","sans-serif""><span style="color:#444444"><span style="letter-spacing:.6pt">图1 控制程序</span></span></span></span></span></span></span></span></span></p>
<p align="left" style="text-align:left"> </p>
<p align="left" style="text-align:left"><span style="font-size:8.5pt"><span style="background:white"><span style="font-family:"微软雅黑","sans-serif""><span style="color:#444444"><span style="letter-spacing:.6pt">图2 灯带显示效果</span></span></span></span></span></p>
<p><span style="font-size:10.5pt"><span style="background:white"><span style="line-height:24.0pt"><span style="font-family:Calibri,sans-serif"><span style="font-size:8.5pt"><span style="background:white"><span style="font-family:"微软雅黑","sans-serif""><span style="color:#444444"><span style="letter-spacing:.6pt">程序文件:</span></span></span></span></span></span></span></span></span></p>
<p> </p>
<p>下载了楼主的测试程序看看效果</p>
<p>看着不错，下载试试</p> <p>代码看着真简洁</p>
soso 发表于 2021-3-26 09:00
代码看着真简洁
<p>这的确是Thonny这款开发工具的突出特点！</p>
安达街 发表于 2021-3-26 07:53
看着不错，下载试试
<p>的确是比较好玩的，又买了个WS2812B全彩LED灯环，刚寄来，测试成功了再发上来。</p>
Jacktang 发表于 2021-3-26 07:34
下载了楼主的测试程序看看效果
<p>有WS2812B全彩LED灯带/环马上即可测试。</p>
<p>WS2812B全彩LED灯环的驱动完成啦！</p>
<p></p>
<p>视频:</p>
<p></p>
<p>程序文件：</p>
<p> </p>
<p> </p>
<p> </p>
<p>换成C代码估计得乘以50</p>
freebsder 发表于 2021-3-26 14:12
换成C代码估计得乘以50
<p>没错！！！</p>
jinglixixi 发表于 2021-3-26 10:27
WS2812B全彩LED灯环的驱动完成啦！
视频:
程序文件：
<p>树莓派Pico玩彩灯控制，从编程的角度好像比单片机容易</p>
<p>楼主的体会呢</p>
<p>现在编程真是越来越简单了哈！</p>
Jacktang 发表于 2021-3-26 15:45
树莓派Pico玩彩灯控制，从编程的角度好像比单片机容易
楼主的体会呢
<p>是呀，舒服！</p>
w494143467 发表于 2021-3-26 17:12
现在编程真是越来越简单了哈！
<p>开发工具对路！</p>
<p>Wrap中间的语句是汇编吗?不像Python语句呀。</p>
serialworld 发表于 2022-1-30 18:27
Wrap中间的语句是汇编吗?不像Python语句呀。
<p>使用其驱动库自带的，估计是受延时的要求调用汇编之类来解决的。</p>
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