基于DS18b20的孵化器温度控制系统.doc

基于DS18B20的孵化器温度控制系统 摘 要 目前，大多数温度测控系统在进行温度检测时，都是用普通的模拟型温度传感器将温度转化为电量后，经信号放大电路放大到适当的范围，再由A/D转换器转换成数字量来完成的。这种电路结构复杂，调试困难，精度易受元器件参数的影响。本设计采用集成温度传感器DS18B20，该传感器可以将温度信号直接转化为数字量输出，该电路结构简单、可靠性强。本设计的硬件部分以PIC16C57单片机为核心,扩展8255、DS18B20、键盘显示器等器件。通过单片机的编程，实现了以下功能：孵化器温度的测量与显示；用户设定功能；对电加热管的模糊化控制。实践证明，孵化器温度控制系统中应用单片机，具有设计简单、温控准确、可靠性高、功能易扩展等优点。 关键词:温度检测,数字温度传感器,单片机，模糊控制 Hatchibator Temperature Control System Based on DS1820 Abstract At present，the majority temperature observation control system when carries on the temperature examination, all is with the ordinary simulation temperature sensor the temperature after the electric quantity inversion, enlarges through the signal enlargement electric circuit to the suitable scope, and by A/ D switch transforms the digital quantity to complete. This kind of electric circuit structure complex, the debugging difficult, precision easily primary device parameter influence. This design uses integrated temperature sensor DS1820, this sensor may transform the temperature signal as the digital quantity output directly, this electric circuit structure simple, reliable. This design “hatchibator temperature control system based on DS1820 ” the hardware part take the PIC16C57 single-chip microcomputer circuit as a core, Expands 8255、DS1820、keyboard monitor and so on. Through the single-chip microcomputer circuit programming, has realized the following function: Hatchibator temperature survey and demonstration; User hypothesis function; To electric heating tube fuzzy control . The practice proved that, the hatchibator temperature control system, has the design simply, temperature control accuracy, the reliability high, the function easy to expand the merits and so on. Key word: Temperature measuring, Digital temperature sensor, The single-chip microcomputer, Fuzzy control 目 录 1 绪论 1 1.1 本设计研究的意义 1 1.2 单片机在温度控制上的探讨 1 1.3 本设计采用的单片机及温度采集芯片 2 1.4 本设计的研究内容 3 2 DS18B20数字温度传感器的原理与构造 4 2.1 DS18B20的特性 4 2.2 DS18B20引脚及功能 4 2.3 DS18B20的工作原理 6 2.4 多片DS18B20连接时的结