"基于51单片机的函数信号发生器设计与实现"

本系统利用单片机AT89S52采用程序设计方法产生锯齿波、正弦波、矩形波三种波形，再通过D/A转换器DAC0832将数字信号转换成模拟信号，滤波放大，最终由示波器显示出来。这个系统能产生1Hz—3kHz的波形，并可以通过键盘来控制三种波形的类型选择和频率变化，并通过液晶屏1602显示其各自的类型以及数值。 在本系统中，主要包括信号发生部分、数/模转换部分以及液晶显示部分三部分。其中，信号发生部分通过单片机程序设计来实现三种波形的产生，数/模转换部分则利用DAC0832模块将数字信号转换成模拟信号，再经过滤波放大，最终显示在示波器上。而液晶显示部分则通过液晶屏1602来显示波形的类型和频率数值，使用户可以直观地了解当前波形情况。 关键词：单片机AT89S52、DAC0832、液晶1602 Summary: This system utilizes the AT89S52 single-chip microcomputer and program design to generate sawtooth wave, sine wave, and square wave, followed by the conversion of digital signals into analog signals through the D/A converter DAC0832. The analog signals are then filtered and amplified before being displayed on the oscilloscope. The system is capable of generating waveforms with frequencies ranging from 1Hz to 3kHz. The user can control the type and frequency of the waveforms through the keyboard, with the selections and values displayed on the 1602 liquid crystal display. The system is comprised of three main parts: the signal generation section, the A/D conversion section, and the liquid crystal display section. The signal generation section uses single-chip microcomputer program design to produce the three waveforms, while the A/D conversion section utilizes the DAC0832 module to convert digital signals into analog signals, which are then filtered and amplified before being displayed on the oscilloscope. The liquid crystal display section uses the 1602 LCD to show the waveform types and frequency values, allowing users to easily understand the current waveform conditions. Keywords: AT89S52 single-chip microcomputer, DAC0832, 1602 LCD