调节电位器，可以改变输出电压，输出电压的值会在四位数码管上显示出来。其中按键为复位键，用于单片机复位，使数码管显示清零。操作简单，使用方便。-Adjust potentiometer, you can change the output voltage, output voltage at the value on the four digital tube display. Reset button for one of keys for single-chip reset, so that