基于凌阳61单片机的小车循迹程序，区分了大弯小弯，采用PWM调节方波的占空比来控制直流电机的转速。循迹用st188探头。-Based on Sunplus 61 MCU car tracking procedures, a distinction between small bend big bend, adjustable square wave using PWM duty cycle to control the DC motor speed. Traction with st188 pr