PWM是什么东东，学习它就这么简单！
PWM, 全称Pulse Width Modulation，即脉冲宽度调制，简称脉宽调制。脉冲宽度调制（PWM）是一种对模拟信号电平进行数字编码的方法，我们利用方波的占空比被调制的方法，来对一个具体模拟信号的电平进行编码。利用电平的通断时间，来控制输出电压的大小这时，IO口输出电压=（接通时间/脉冲时间）*最大电压值。
https://p1-tt.byteimg.com/large/pgc-image/cc90ec64d8da45a58c6240874fff24d1?from=pcPWM编码电压
硬件上，利用Audrino的AD转换功能，AD采集的原理以前的文章有介绍过，就不在重复了。通过A0口采集到变阻器的分压数值，通过公式转换为的PWM编码后的电压值，然后在IO 11输出给LED，实现LED的亮度调节。
https://p6-tt.byteimg.com/large/pgc-image/ba89b7218e8a40d68b4add8f8d422fd9?from=pc
2.程序解读
算法描述：
通过analogRead()函数读取模拟电压值，转换成数字存储到val变量中，并在串口监视器中显示，目的是观察电压值是否转换过来了。再通过analogWrite()函数配置PWM编码的电压从接LED的IO口输出，形成一个输入模拟电压和输入电压的关系。这样，我们只需要旋转滑动变阻器，LED的亮度就会跟着改变了。
代码解读：
详细解读请看注释。
https://p3-tt.byteimg.com/large/pgc-image/73d7ca66ee514247b3f5abb07b19306a?from=pc代码
3.实物效果
当我们旋转滑动器，打开串口监视器，可以看到上面的数值在改变，面包板的LED亮度也跟着改变，当数值变大，LED变亮，当数值变小，LED变暗。
串口显示图：
https://p1-tt.byteimg.com/large/pgc-image/c17c55e7b578468a98b1c6c08568cc19?from=pc串口采集值
实物图：
https://p3-tt.byteimg.com/large/pgc-image/d54e5c9bd404445db9f967e2022ebc1a?from=pc实物连接图
一起来看一下效果演示：
欢迎点赞，评论和转发，关注头条号：奔跑的晶体管 可以学到更多的电子知识哦。
https://p3-tt.byteimg.com/large/pgc-image/1f909919fdbb41b696fdb3fdba404c11?from=pc效果演示
朋友们对于PWM又是怎么理解的呢?欢迎留言评论！
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