通过L297、L298来控制两项步进电机的旋转，速度十档，电机旋转27圈就会回头，再转够27圈自停。可设定好档位后再开始，中途可以自由停止或是换向。-Through L297, L298 to control two stepper motor rotation and speed of ten stalls, motor rotation stop twice. Stalls can be set well after the start, or stop half-way free-for-

单片机和l297 ,l298控制步进电机正反转和转速-MCU and l297, l298 and positive control of stepper motor speed

多功能小车仿真。L298驱动直流电机，有液晶LCD显示方向，速度。-Multi-function car simulation. L298-driven DC motor,there is the direction of liquid crystal LCD display,speed.