基于单片机的信号发生器设计

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摘要：此函数信号发生器是基于单片机AT89C51设计而成的，能够产生频率范围在0Hz—535Hz的锯齿波、正弦波、三角波、矩形波四种波形，并且能够通过液晶屏1602显示各自的波形类型以及频率数值。首先，单片机AT89C51经过程序设计的方法生成各种数字信号，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。接着，通过按键来控制四种波形的类型选择、和频率数值选择，并由液晶屏1602显示其频率数值和波形类型 。总的系统包括信号发生部分、数/模转换部分以及液晶显示部分三大部分，其中尤其对数/模转换部分和波形产生和变化部分进行详细论述。

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关键词：AT89C51DAC0832  液晶屏1602

Title : Design of signalgenerator based on mcu

Abstract:This function signal generator is based on the AT89C51 microcontrollerdesign, capable of generating frequency range 0Hz-535Hz sawtooth, sine,triangle wave, square wave, four types of waveforms, and each type of waveformand frequency can be displayed by the LCD screen 1602value. First, AT89C51microcontroller programming method to generate a variety of digital signalthrough the D / A converter DAC0832 converts the digital signal into an analogsignal, filtered and amplified. Then, the key to control the four waveform typeselection, and frequency selection of values​​,the value of its frequency and waveform type is displayed by the LCD screen1602. The total system including a signal generating part of the digital /analog converting section and a liquid crystal display section of three parts,wherein in particular for the digital / analog conversion part and the waveformgenerating and changing part discusses in detail.

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keywords:  AT89C51 DAC0832  LCD in screen 1602

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单片机AT89C51经过程序设计的方法生成各种数字信号，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