【精品】基于单片机数字温度计毕业设计.doc

摘 要 本论文介绍了一种以单片机为主的控制器件，一种以DS18B20为温度传感器的新型数字温度计。主要包括硬件电路的设计和系统程序的编写。硬件电路主要包括主控制器，测温控制电路和显示电路等，主控制器采用AT89S51单片机，温度传感器采用美国DALLAS半导体公司生产的DS18B20，显示电路采用8位共阴极LED数码管，74HC573为驱动的动态扫描显示。测温控制电路由传感器和预制温度比较电路组成。系统程序主要包括主程序，测温子程序和显示子程序等。DS18B20新型单总线数字温度传感器是DALLAS公司生产的单线数字温度传感器，集温度测量和A/D转换于一体，直接输出数字量，具有接口简单、精度高、抗干扰能力强、工作稳定可靠等特点。 由于采用了改进型智能温度传感器DS18B20作为检测元件，与传统的温度计相比，本数字温度计减少了外部的硬件电路，具有低成本和易使用的点特点。DS18B20温度计还可以在高温报警、远距离多点测温控制等方面进行应用。 关键词：STC89C52，DS18B20，数码管，动态显示 ABSTRACT This paper introduces a microcontroller based control device, a temperature sensortoDS18B20 for the new digital thermometer. Including hardware design and system procedures for the preparation. Hardware circuit includes a main controller, temperature control circuit and display circuit, the main controller uses STC89C52, DALLAS Semiconductor temperature sensor used by the U.S. companys DS18B20, display circuit with eight common cathode LED digital tube, 74HC573-driven dynamic scan display. Temperature control circuit from the sensor and the pre-comparison circuit temperature. System program including the main program, subroutine, and display routines such as temperature. DS18B20 new single-bus digital temperature sensor is produced by DALLAS-wire digital temperature sensor, set the temperature measurement and A / D conversion in one, the direct output of digital content, with a simple interface, high precision, strong anti-interference ability, stable and reliable, . As a result of improved temperature sensor DS18B20 as the detection of intelligent components, compared with the traditional thermometer, digital thermometer to reduce the external hardware circuitry, low cost and easy to use point features. DS18B20 thermometer can also be at a high temperature alarm, remote control multi-point temperature measurement applications in areas such as. Keywords: STC89C52, DS18B20, digital control, dynamic display 目 录 第1章 前言 1 1.1 设计目标 1 1.1.1 前景 1 1.1.2 实现的可行性 1 1.2 设计思路 2 1.2.1 硬件设计思路 2 1.2.2 软件设计思路 2 第2章 方案论证 4 2.1