本自由摆的平板控制系统采用C8051F020单片机作为主控系统，ULN2003作为电机驱动模块，C8051F020单片机通过ULN2003驱动模块驱步进机，使步进机上的平板随着摆杆的摆动而旋转。硬件部分主要包括C8051F020单片机最小系统，ULN2003电机驱动电路，MMA7361QR加速度传感器，电源模块以及lcd显示等。-Free pendulum flat-panel control system using the C8051F020 microcontroller as a master system, ULN2003 as a motor drive modules of C8051F020 microcontroller through the ULN2003 driver module to drive the stepper on the stepper plate rotate with the swing of the pendulum. The hardware section includes the minimum system C8051F020 microcontroller, the ULN2003 motor drive circuit, MMA7361QR acceleration sensor, power supply module and lcd display.