本程序使用STC12C5AXXS2系列单片机，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，并通过串口在上位机显示当时的输出电压。仅需一片单片机和两个10k的电阻和0.1uF的电容。内有硬件连线图。-This procedure used STC12C5AXXS2 series of single-chip, in the P1.3 output voltage of 0 ~ 5V. Through the serial line to control the output voltage and PC through the serial port in the display of the output voltage at the time. Only a single chip and two 10k resistors and a 0.1uF capacitor. There are plans to connect the hardware.