测速是工农业生产中经常遇到的问题，学会使用单片机技术设计测速仪表具有很重要的意义。

要测速，首先要解决是采样的问题。在使用模拟技术制作测速表时，常用测速发电机的方法，即将测速发电机的转轴与待测轴相连，测速发电机的电压高低反映了转速的高低。使用单片机进行测速，可以使用简单的脉冲计数法。只要转轴每旋转一周，产生一个或固定的多个脉冲，并将脉冲送入单片机中进行计数，即可获得转速的信息。

-Speed is often encountered in industrial and agricultural production problems, learn to use the design speed meter microcontroller technology has important significance. To speed, we must first resolve the sampling problem. Speed in the use of simulation technology to produce tables, commonly used method of tachometer generator, the generator is about speed and sensed axle shaft connected to the generator speed reflects the speed high and low voltage level. Speed using the SCM, you can use a simple pulse counting method. As long as the shaft per revolution, resulting in one or multiple fixed pulse, and pulse into the microcontroller to count, you can get speed information.