基于单片机的数字温度计的毕业设计论文.doc

毕业论文 兰州工业学院 题目：基于单片机的数字温度计的设计 系 别: 电子信息工程系 专 业: 应用电子技术 班 级: 应电10-1班 姓 名: 薛耀刚 学 号: 201010102141 指 导 教 师: 彭琳茹 日 期: 2013-3-11 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AT89S51单片机的一种温度测量及报警电路,该电路采用DS18B20作为温度监测元件，测量范围0℃-～+100℃，使用LCD模块显示，能设置温度报警上下限。正文着重给出了软硬件系统的各部分电路，介绍了集成温度传感器DS18B20的原理，AT89C51单片机功能和应用。该电路设计新颖、功能强大、结构简单。 关键词：温度测量；DS18B20；AT89S51 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 technology.Traditional thermocouple and temperature components are the second resistor.The thermocouple and thermal resistance are generally measured voltage, and then replaced by the corresponding temperature, these methods are relatively complex, requiring a relatively large number of external hardware support. We use a relatively simple way to measure. The introduction of a cost-based AT89C51 MCU a temperatur measurement circuits, the circuits used DS18B20 high-precision temperatur sensor, measuring scope 0℃-～+100℃,can set the warning limitation, the use of seven segments LED that can be display the current temperature. The paper focuses on providing a software and hardware system components circuit, introduced the theory of DS18B20, the founctions and applications of AT89C51 .This circuit design innovative