本程序使用STC12C5AXXS2系列单片机SCM，在P1.3输出0～5V的电压。可通过串口在线对输出电压进行控制，并通通过串口在上位机显示当时的输出电压。仅需一片单片机SCM和两个10k的电阻和0.1uF的电容。内有硬件连线图。 已通过测试。

-This program uses STC12C5AXXS2 series SCM SCM, 0 ~ 5V voltage output at P1.3. The output voltage control via the serial line, and pass through the serial port in the PC display when the output voltage. Only one SCM SCM and two 10k resistor and 0.1uF capacitor. Within the hardware wiring diagram. Has been tested.