“牛刀小试”循迹小车程序 以89c51单片机为主控，PWM控制直流电机，两个红外传感器检测泡沫板上黑白线，让小车以最快速度循过弧线与弯线。- Chopper small scale car tracking program- with 89c51 microcontroller as master, PWM control of DC motors, two infrared sensors detect black and white lines of foam board, allowin