以STC12C5052AD单片机&LCD1602实现一个单闭环直流电机调压调速控制，用键盘实现对直流电机的起/停、正/反转控制，速度既可用键盘数字量设定也可用电位器连续调节-To STC12C5052AD SCM & LCD1602 achieve a single-voltage closed-loop DC motor speed control, using the keyboard to achieve the effect of the DC motor on/off, pos