基于51单片机的高精度恒温控制系统设计.doc

毕业设计（论文） 课题名称： 基于51单片机的高精度 恒温控制系统设计 专 业（系 班 级 学 生 姓 名 指 导 老 师 日 期 摘要 温度是工业生产过程和实验过程中比较重要的一个参数，精确的温度是很重要的。目前温度测量系统种类繁多，功能参差不齐。提出采用单总线数字式温度传感器DS18B20和单片机组成的新型高精度温度测量仪的设计。介绍了温度传感器DS18B20的结构，特点和工作原理，数字温度测量传感器DS18B20是单一总线的高精度测量器件，设计了DS18B20和ST89C52单片机的温度测量系统引荐电路和软件编程，主要包括温度采集，温度显示及报警控制等功能，它克服了以前模拟式传感器与微机接口时需要的A/D转换器及其他复杂外围电路的缺点。整个系统具有结构简单，测量精度高，传输距离远，抗干扰能力强，温度读取方便和造价低等一系列优点，本文就是运用单片机及其接口和集成单总线温度传感器DS18B20国建一个高精度温度测量和显示系统，并且通过开关进行温度上限的位置，设计的电路简单，易于实现。 关键词：单片机；DS18B20；A/D转换；温度测量 Abstract Temperature is the process of industrial production and experimental process is a relatively important parameters, precise temperature is very important. The system for measuring the temperature variety, functional uneven. The single bus digital temperature sensor DS18B20 and single-chip microcomputer model of high precision temperature measuring instrument design. Introduces the temperature sensor DS18B20 structure, characteristic and working principle of digital temperature sensor DS18B20, is a single bus device design of high precision measurement, DS18B20 and AT89C52 SCM temperature measurement system introduced circuit and software programming, mainly including temperature collection, temperature display and alarm control and other functions, it overcomes the previous analog sensor and computer interface to A/D converter and other complex peripheral circuit. The whole system has the advantages of simple structure, high measuring precision, long transmission distance, strong anti-interference ability, low cost and convenient temperature reading a series of advantages, this paper is the use of microcomputer and its interface and integrated single bus temperature sensor DS18B20 to build a high precision temperature measurement and display system for lady, and through the switch temperature upper limit position, the design of the circuit is simple, easy to