通过10HZ信号做门信号来对被测信号进行1S钟上升沿的计数,并显示到LED上,实现频率的测量显示.此设计只可以用来测方波的,至于像正弦等其它波要经过转换后才能计数.-Using 10HZ signal to get the 1S gate signal,then count the rising edge of the input signal, by LED to display, aim at realization of the frequency. measurements show that. This can only be used to test the design of the square wave, as such as sine wave after the other count before conversion.