毕业设计（论文）多功能电子温度计的设计.docVIP

多功能电子温度计的设计 摘 要 本文设计的具有语音录放功能的电子温度计采用AT89S52作为核心器件实现对系统的自动控制，采用单片机串行处理结构。外界温度经AD590集成温度传感器采集，温度变化转换为线性电压信号，再经由OP07构成高精度低温漂的放大电路处理后，作为AD570的模拟输入信号，由AD570完成A/D转换，得到8位的数字信号送入单片机（AT89S52）。AT89C52将采集到温度值在LED数码管上显示出来。此外温度预制，报警电路模块，语音播放功能也由单片机AT89S52完成。通过系统的设计与实现说明本设计方案切实可以，能够完成题目所要求的基本功能部分，并留有相应的接口，为完成扩展功能打下基础。 关键字：单片机;AD590 ;AD570 ;ISD25120 ABSTRACT This article designs has the pronunciation to disseminate news the function the clinical thermometer to use AT89S52 to realize as the core component to systems automatic control, uses the monolithic integrated circuit serial processing structure. The open air temperature after AD590 integration temperature sensor gathering, the temperature change transforms into the linear voltage signal, again amplifying circuit processing which floats after the OP07 constitution high accuracy low temperature, takes AD570 the simulator input, completes A/D by AD570 to transform, obtains 8 digital signals to send in the monolithic integrated circuit (AT89S52). AT89C52 will gather the temperature value to demonstrate on the LED nixietube. In addition the temperature prefabrication, the alarm circuit module, the pronunciation broadcast function also completes by monolithic integrated circuit AT89S52. With realizes through systems design showed that this design proposal practical may, be able to complete the basic function part which the topic requests, and leaves leeway the corresponding connection, to complete the extended function to build the foundation.. key words: Monolithic integrated circuit; AD590; AD570; ISD25120 目 录 1 绪论 1 2 主要模块的方案论证与比较 2 2.1温度传感器的选择 2 2.2 A/D转换器的选择 2 2.3语音提示模块 3 3 总系统设计方案 4 3.1总系统方案设计描述 4 3.2系统电路原理图 4 4 主要电路设计与参数计算 6 4.1电源电路模块 6 4.2温度检测、放大模块 6 4.3 A/D转换模块 8 4.4 温度设制、显示及报警电路模块 8 4.5串行通信模块 9 4.6 语音播放模块 10 4.6.1录音、放音简介 10 4.6.2 ISD25120简介 10 4.6.3 芯片工作原理 12 4.6.4 硬件电路设计 13 4.6.5 本方法的特点 13 5 系统软件设计 14 5.1系统程序流程图 14 6 系统测试 16 6.1 硬件测试 16 6.1.1 单元模块的测试 16 6.1.2 系统整体测试 16 6.1.3 硬件与软件的联机测试 16 6.2