小车寻光，向光源方向前进，我用的是普通的光敏电阻制作的模块，输出地是数字信号，要自己做个灯盏，这样才能有导向性-Car search light, the light source direction, I use the normal production of photosensitive resistor module, the output to a digital signal, it has to be a lamp, so as to have oriented