基于AT89C51单片机的量程自切换频率计

摘要

量程自切换频率计采用AT89C51单片机控制，主要由信号放大整形电路，单片机控制电路，分频电路，信号显示电路以及电源电路五个模块组成。本文阐述了系统的硬件组成及工作原理，论证了设计方案的可行性。系统程序采用C语言编写，经Keil软件进行调试后在Proteus软件中进行仿真，并且经过实物的测试，可以实现对不同波形的频率进行测量。具有自动切换并指示量程，精度较高，测量范围较大等特点%Range switching frequency meter is controlled by AT89C51. This system is mainly composed of the signal amplification shaping circuit,single-chip control circuit,divider circuit,the signal display circuit and power circuit. This paper describes the hardware components and working principle of the system ,and demonstrates the feasibility of the design program. The system program written by C language is debugged by the Keil software,after which simulated in the Proteus software.And after physical test that can realize the measurement of the frequency of sine wave,triangle wave and square wave.With automatic switch and indicator range, high accuracy, measuring range.