基于单片机AT89C51的语音温度计的设计

基于单片机AT89C51的语音温度计的设计

论文编号:JD169 汇编程序,字数:22582,页数:54

摘要

本系统是一个基于单片机AT89C51的语音温度计的设计，用来测量环境温度，测量范围为0－100度。整个设计系统分为5部分：单片机控制、温度传感器、液晶显示、语音报温以及键盘控制电路，同时还采用了音频功率放大器LM386来对音频信号进行放大，以满足人们的听觉要求。整个设计是以AT89C51为核心，通过DALLAS公司的单总线数字温度传感器DS18B20来实现环境温度的采集和A/D转换，同时因其输出为数字形式，且为串行输出，这就方便了单片机进行数据处理，但同时也对编程提出了更高的要求。单片机把采集到的温度进行相应的转换后，使之能够方便地在液晶上输出，同时也方便了放音的实现。语音录放选用的集成块是ISD1420 芯片，其保真度高，录音效果好，而且经济实惠。LCD采用的是TC1602A，它具有功耗低、体积小、显示内容丰富、超薄轻巧等优点，应用越来越广泛。整个设计的重点在于编程，因为其外围电路相对比较简单，实现容易。在本论文中附带了软件实现的流程图以及部分子程序以及各种硬件电路图。

关键词：单片机；数字温度传感器；液晶显示；语音录放；编程

Abstract

This system is a design of the speech thermometer according to the microprocessor AT89C51,which is used to measure the environment temperature, the scope is between zero and one hundred degrees .The whole design system is divided into 5 parts: A microprocessor control, temperature sensor，the LCD display, the speech report and the keyboard control circuit, at the same time ，we use the audio power amplifier LM386 to amplify the audio signal, in order to satisfy people’s desire of hearing. The whole design take AT89C51 as the core, use the one-wire digital temperature sensor DS18B20 which is made by the company of DALLAS to carry out the collection of the environment temperature and A/D transition, at the same time because its outputs is the numerical form and serial data transfer, so this makes the microprocessor deal with the data processing convenience but it also make us difficult to program, it request us must hold its reading and writing scheduling strictly. The microprocessor transforms the temperature value we collect from the temperature sensor, so that we can easily display it in the LCD display and the playback. The speech recoding & p layback I choose to use is the IC of ISD1420, it has high fidelity, good record effective, and economic. The LCD I choose is TC1602A, its power consume is low, it has many advantages , for example, the volume is small, the contents is abundant, super thin and agile etc, and its application is becoming more and more extensive. The whole design lies in the program, because its outer circuit is much more simple, and it can carry out more easily. In my thesis, there are flow chart and parts of subprogram and various hardware circuit diagrams.

Keywords:Microprocessor; Digital temperature sensor;The LCD display;Speech recoding & playback;Programme

摘要 .........................................................................1
Abstract .......................................................................2
引言........................................................................... 4
1 设计要求 ....................................................................5
2 设计思路以及方案选择论证.................................................... 5
2.1 系统设计思路 ...............................................................5
2.2 方案选择论证............................................................... 5
3 系统电路的软硬件设计以及各模块原理介绍...................................... 7
3.1 系统电路的硬件设计......................................................... 7
3.1.1核心控制CPU的介绍 .........................................................7
3.1.2键盘控制模块 ............................................................ 10
3.1.3温度采集模块 ......................................................... ...12
3.1.4语音录放模块......................................................... ...17
3.1.5音频放大模块 ............................................................ 23
3.1.6显示模块 ......................................................... .......25
3.2 系统软件设计 ............................................................. 29
4 调试仿真验证及效果分析......................................................30
5 工程设计 ......................................................... .........32
5.1 使用Protel99设计原理图 ....................................................32
5.2 PCB的制作 ......................................................... .......34
6 心得体会 .................................................................. 35
谢辞 ......................................................... ..............37
参考文献 ............................................................. ........38