简单的自行车里程速度计数器，基于mcs51系列的看看吧。能够显示速度和行驶公里数，不一定特别好，初学者，体谅哈。-simple speed bicycle mileage counter, mcs51 based on the series and watch it. To show speed and mileage driven, not particularly good, beginners, understanding and Kazakhstan.