毕业设计：基于单片机的数字频率计

随着无线电及电子技术科学技术的发展与普及，数字频率计在电子、通讯等领域中的实验、研究开发、生产中得到了非常广泛的使用。数字频率计是近代电子技术领域的重要测量工具之一，同时也是其他许多领域广泛应用的测量仪器。它不仅可以测量正弦波、方波、三角波、尖脉冲信号和其他具有周期特性的信号的频率，而且还可以测量它们的周期。

In recent years, with the rapid development of wireless technology and electronic technology , digital cymometer has used in experiment , research& design , manufacture at electronic and communication fields.Digital cymometer is one of the important measurement tools in the field of modern electronic technology, it is also widely used in many other areas of the measuring instruments. It can measure not only the sine wave, square wave, triangle wave, a sharp pulse but also can measure other characteristics of the signal wave.

该数字频率计系统以AT802051单片机为核心，应用单片机的数字运算和控制功能实现了量程的自动切换并采用LED数码显示实时地将所测的频率显示出来，既满足了测量的时间要求和精度要求，又具有很好的性价比。

The paper introduces one cymometer system based on singlechip which applys the singlechip`s function of operation and control and displays ther result by led. The system measures up design precision at low cost.

设计中采用的了单片机直接测频法,由硬件电路和软件部分实现,电路稳定,精度高，其中主要涉及信号的预处理、波形转换及频率数据采集、计算、转换及量程的自动转换等功能模块。

Single-chip Direct Frequency Measurement Method is used in this design , By the hardware circuit and software to achieve, Circuit stability, high accuracy, Mainly involved in signal pre-processing, waveform and frequency conversion, data acquisition, calculation, conversion, and range of features such as automatic conversion of the software and hardware modules .