I摘要摘要本课题设计的是基于单片机的仓库多点温度采集系统，温度是生产过程和科学实验中普遍且重 要的物理参数 。在生产中，为了高效生产，必须对生产过程中的主要参数，如温度、压力、流量、 速度等进行有效的控制。其中温度在生产过程中占有相当大的比例。准确有效地测量、采集、控制 温度是优质、高产、低耗和安全生产的主要条件。目前在我国许多大棚、仓库等需要温度控制的单位仍采用测温仪器与人工抄录、管理相结合的 传统方法，这不仅效率低，还易出错。采用单片机与数字温度传感器等可构成温度采集系统，运用 先进的思想，设计一种可以用于大规模多点温度采集系统。将极大地提高工作效率和测量、采集、 控制结果的准确性。单片机是一种集 CPU、RAM、ROM、I/O 接口和中断系统等部分于一体的器件，只需要外加 电源和晶振就可实现对数字信息的处理和控制。单片机由于其微小的体积和极低的成本，而广泛的 应用于家用电器、工业控制等领域中。多点温度采集系统是利用温度传感器 DS18B20 检测温度， 并由单片机处理显示。本设计利用 AT89C51 单片机为处理器，结合温度采集电路、键盘电路、显示电路、报警电路 等实现对多点温度的实时检测与显示。通过设计实物，对系统存在的问题进行了分析和总结，并提 出了改进措施。 实验证明：该信号采集系统性能稳定，采集精度高，具有极高的性价比。关键词：关键词：单片机；DS18B20；温度采集；单总线 ABSTRACT This topic is the design of multipoint temperature acquisition system based on SCM warehouse, temperature is a common and important physical parameters in the production process and scientific experiments. In production, in order to efficient production, must be the main parameters of production process, such as temperature, pressure, flow, speed of effective control. The temperature has quite large proportion in the production process. Accurately measuring, acquisition, control of temperature is the main condition of high quality, high yield, low consumption and production safety.At present, in our country a lot of greenhouse, warehouse temperature control units are still using the traditional method of temperature measurement instrument and manual copy, the combination of management, this is not only inefficient, but also easy to make mistakes. Using SCM and digital temperature sensor can be formed into a temperature acquisition system, using the advanced thought, a design can be used in large-scale multipoint temperature acquisition system. Will greatly improve the work efficiency and measuring, acquisition, control the accuracy of the results.IISingle-chip is a device which consists of a set of CPU, RAM, ROM, I/O interface, interrupt system and other parts. You only need external power supply and clock then the digital information processing and control can be achieved on. Because of the small scale, low price and high efficiency of MCU, it is widely used in home appliances and industrial control. Multi-channel temperature acquisition system is used temperature thermometer DS18B20 to detect the temperature, process and display by the single-chip. This design uses AT89S52 as microprocessor to realize design goal this design including temperature gathering circuit, keyboard circuit, display circuit, alarm circuit etc. to achieve the temperature detection and the display. To introduce the problems during the debugging are analyzed and summarized, some measure about the system improvement are proposed. The result of experiments indicated that signal sampling system has good performance, high precision, and has a very high pertormance-to-price ration.Key words: MCU；DS18B20；temperature acquisitio； unibus 目录目录1 绪论.1 1.1 选题背景.1 1.2 本设计国内外状况.1 1.3 本设计的任务和主要内容.2 2 系统总体设计.3 2.1 系统概述.3 2.2 系统工作原理分析.3 3 系统的硬件设计.4 3.1 温度采集系统的开发过程.4 3.2 单片机的最小系统设计.4 3.2.1 单片机的选型.4 3.2.2 AT89C51 的性能及应用.5 3.2.3 时钟电路设计.7 3.2.4 复位电路设计.8 3.3 温度采集接口电路设计.9