采用MSP430单片机对步进电机的控制，通过I/O口输出的时序方波作为步进电机的控制信号，信号经过芯片ULN2003驱动步进电机；同时，用 4个按键来对电机的状态进行控制，并用数码管动态显示电机的转速。-Using MSP430 microcontroller stepper motor control, through the I/O port output timing square wave as stepper motor control signals, the signal after the chip ULN2003 stepper motor driver　same time, with four buttons to control the state of the motor , and use digital tube dynamic display the motor speed.