此程序是利用2051单片机P1.0,P1.1精密比较器功能实现a/d转换通过P1.0电位器调节，控制七只电磁铁动作间隔-This program implement A/D conversion by using precise comparision function of P1.0 and P1.1 of MCU 2051. P1.0 is used to adjust potential meter to control the time intervals of seven magnet