简易频率计，能够测试0~10000KHz之间的脉冲信号频率，并显示在数码管上。利用了100KHz的脉冲作为基准信号。包含课程设计报告。-Simple frequency meter, to test pulses between 0 ~ 10000KHz signal frequency and displays in the digital pipe. Use 100KHz pulse as a reference signal. Includes curriculum design repo