数字温度计设计-毕业设计.doc

数字温度计设计 学生：XXX 指导教师：XXX 内容摘要：在这个信息化高速发展的时代，单片机已经成为最经典的微控制器，单片机技术普及到我们的生活，工作，科研，各个领域，已经成为一种较为成熟的技术，作为一名工科类学生，我们已经学习了单片机，就应该把它熟练的应用到我们的实际生活当中。本文将要介绍一种单片机控制的数字温度计，这种温度计属于多功能温度计，它具有读数方便，测温范围广，测温准确，数字显示，适用范围宽等特点。主要用于对测温要求比较准确的场所，或科研室使用，该设计控制器使用单片机AT89S51，测温传感器使用DS18B20，本温度计可以调整显示日期、时间，可设定最低、最高温度报警值。测量温度超过设定的温度上、下限，启动蜂鸣器和指示灯报警。温度显示稳定。在实现温度显示的同时，能准确达到以上要求。 关键词：数码管显示 数字温度计 DS18B20 AT89S51 Design for digital thermometer Abstract: In the information age of high-speed development, SCM has become one of the most classic microcontroller, SCM technology spread to our lives, work, research, in various fields, has become a more mature technology, as an engineering student, we have studied the SCM, it should be a good application to our actual life. This paper will introduce a kind of microcontroller control of the digital thermometer, the thermometer belongs to the multi function thermometer, it has reading convenience, a wide range of temperature measurement, accurate temperature measurement, digital display, wide application range and other features. Mainly used for more accurate temperature measurement requirements of places, or scientific research room, the use of SCM AT89S51 controller design, the use of DS18B20 temperature sensor, the thermometer can adjust the display date, time, can set the minimum, maximum temperature alarm value. Measuring the temperature exceeds the set temperature, lower limit, start alarm buzzer and indicator light. Temperature stability. In the realization of temperature display at the same time, can accurately achieve the above requirements. Keywords: SCM digital control digital pipe display thermometer DS18B20 AT89S52 devices 目 录 前言 1 1 数字温度计设计方案的论证 1 1.1 方案一 1 1.2 方案二 1 2 数字温度计详细设计 2 2.1 主控制器 AT89S51 2 2.1.1 AT89S51的特点及特性： 2 2.1.2 管脚功能说明 3 2.1.3 振荡器特性 5 2.1.4 芯片擦除 5 2.2 温度采集部分的设计 5 2.2.1 温度传感器DS18B20 5 2.2.2 DS18B20温度传感器与单片机的接口电路 10 2.3 显示部分电路设计 12 2.3.1 74LS164引脚功能及特性 12 2.3.2 显示电路 13 2.4 报警电路的实现 14 2.5