说明：  单片机与光电传感器测量转速程序 首先，你的原理图我没有，我就按我开发板的原理图来写。原理图在我的博客上：http://hi.baidu.com/mcu 5Fspaces/album/item/8b0e987e63e7ed360cd7daf7.html 数码管是4位的，把红外传感器当霍尔转速传感器。如果这些器件和单片机连接和你 的不一样，自己改一下定义就行。
(SCM and photoelectric sensor speed measurement procedure First of all, you I do not have the schematic diagram, according to my on my development board to write the schematic diagram. Schematic diagram on at my blog: http://hi.baidu.com/mcu 5Fspaces/album/item/8b0e987e63e7ed360cd7daf7.html digital control of the four are the infrared sensor when the Hall speed sensor. If these devices and single-chip connectivity and you are not the same, change the definition of their own on the line.)