结合飞思卡尔16位单片机MC9S12DG128B完成小车自动寻迹，沿黑线行驶功能(主要用PID算法实现)包括LED和LCD显示-Combination of 16 single-chip Freescale MC9S12DG128B completed car automatically tracing along the black lane function (the main PID algorithm), including LED and LCD display