基于AT89C51单片机的数字温度计设计.doc

基于AT89C51单片机的数字温度计设计
摘要
在日常生活及工业生产过程中,经常要用到温度的检测及控制,温度是生产过程和科学实验中普遍而且重要的物理参数之一。在生产过程中,为了高效地进行生产,必须对它的主要参数,如温度、压力、流量等进行有效的控制。温度控制在生产过程中占有相当大的比例。温度测量是温度控制的基础,技术已经比较成熟。传统的测温元件有热电偶和二电阻。而热电偶和热电阻测出的一般都是电压,再转换成对应的温度,这些方法相对比较复杂,需要比较多的外部硬件支持。我们用一种相对比较简单的方式来测量。
本文介绍一种基于AT89C51单片机作为控制器、使用数字温度传感器DS18B20作为温度采集器的数字温度计。重点阐述了AT89C51的结构性能和引脚功能,DS18B20的性能结构、工作原理和控制方法,以及单片机AT89C51和数字温度传感器DS18B20之间的接口、数据传递。该数字温度计能够测出-20~﹢70℃之间的温度,适合日常生活、工业生产和科学研究等领域对温度测量的需要。
关键词:温度测量;DS18B20;AT89C51
Design of Digital Thermomer Based on SCM AT89C51
Abstract
In daily life and industrial production process, often used in the detection and control of temperature, temperature is the production process and scientific experiments in general and one of the important physical parameter. In the production process, in order to efficiently carry out the production, to be its main parameters, such as temperature, pressure, flow control, etc... Temperature control in the production process of a large proportion. Temperature measurement is the basis of temperature-controlled, more mature thermocouple and ponents are the second thermocouple and thermal resistance are generally measured voltage, and then replaced by the corresponding temperature, these methods are plex, requiring a relatively large number of external hardware support. We use a relatively simple way
to measure.
A digital thermometer collection is designed, which uses SCM AT89C51 as a controller, digital temperature sensor DS18B20 as temperature collector. The structure, pin and function of the AT89C51, the performance of the structure, working principle and control methods of DS1B20, and the interface, data transmission between SCM AT89C51 and digital temperature sensor DS18B20 is introduced. This digital thermometer can detect the temperature from-20℃to70℃.It is suitable for daily life, industrial production and scientific research in areas such as the temperature measurement needs.
Keywords:Temperatur me