基于单片机的DS18B20的温度控制系统毕业论文.doc

基于单片机的DS18B20的温度控制系统 摘　　要 随着社会的发展，自动控制越来越受人们的关注，温度的控制系统也成为人们备受关注的焦点之一。无论是在日常生活中各种家用电器或是工业生产中的生产设备都需要在一定的温度范围内才能正常工作，如果长期工作在温度不合适的环境中，设备的工作寿命将大大受损，甚至会引发更严重的后果。因此设计一个以监控、控制正在工作的电气设备周围环境温度为目的的温度控制系统具有非常大的实际意义。 本系统利用AT89C51单片机作为主控制器分别实现对电气设备工作温度的实时采集、温度值的显示、报警及停止电气设备工作等功能。系统采用数字温度传感器DS18B20采集温度数据，LCD液晶显示屏显示设定的温度范围的上下限值和当前测量值，可通过按键以1℃的步进增加或降低温度范围的上、下限值。当系统测得的温度高于设定的温度上限值或者低于温度设定的下限值时，单片机控制报警电路报警同时驱动继电器器关闭电气设备，从而实现了对于电气设备工作温度的测量及控制的目的。 关键词：单片机；DS18B20；温度测量；实时控制 Design of DS18B20 Temperature Control System Based on Microcontroller ABSTRACT 　　With the development of the society, the autocontrol becomes more and more important. The control of temperature is also becomes one of the focus of attention. Both the house appliances and the industrial production equipment must work in proper temperature range. The equipment will be broke down if it works in the inappropriate environment for a long time. Therefore the temperature control system aimed at monitoring and controlling of the electrical equipment’s ambient temperature has a very large practical significance. 　　This control system bases on AT89C51 single chip and DS18B20 digital temperature sensor. Adopting the AT89C51 microcontroller in the system to collected temperature from the environment positions realizes the temperature display and alarm function. Applying AT89C51 microcontroller –based as main control chip, it realizes the multi-temperature testing by using of digital temperature sensor DS18B20, and the temperature settings can be change by the key-presses with 1 ℃ step. At the time the system use a LCD display module to show the measured temperature. When the system measured temperature is higher than the set temperature upper limit or below the temperature lower limit the system will alarm and turn off the electrical equipment. Key words: microcontroller;DS18B20;temperature measurement;real-time control 目　　录 　　1　概述 1 　　1.1　设计任务 1 　　1.2　设计要求 1 　　1.3　系统设计基础 1 　　1.3.1　AT89C51单片机的介绍 1 　　1.3.2　数字传感器DS18B20的介绍 3 　　2