拧动电位器，会在数码管的前三位显示0-255之间的数值。这就是把模拟电压转换成数字信号。

有些拧动电位器后数码管数可能不会动态变化，请用户按下实验板上的S22复位按键可更新数据

这种显象产生的原因是和AD芯片自身的一些特性有关。-Screw the potentiometer, the top three in the digital display value between 0-255. This is the analog voltage into digital signals. Some twist the number of digital potentiometer may not post dynamic changed, please press the reset button S22 test board can update the data generated by this imaging and AD because some of the features on the chip itself.