基于单片机的简易频率计，可测量1HZ—10KHZ的频率，精准率为1 ，可显示占空比。可测量方波，三角波，正昡波.里面包含原理图和源程序，非常实用，大家可以参考参考-Simple microcontroller-based frequency meter measurable frequency 1HZ-10KHZ, the precise rate of 1 , the duty cycle can be displayed. Measurable square, triangle, positive Xuan wave. Which contains the schematics and source code, very useful, you can refer to reference