基于单片机的DS18B20数字温度控制系统(软件设计)_毕业论文（设计）.doc

摘 要 现今，自动控制技术尤其是温度控制技术在国内外得到广泛的应用和发展。随着国民经济的发展，人们需要对各中加热炉，热处理炉，生化温室中温度进行监测和控制。采用单片机来对他们控制不仅具有控制方便，简单和灵活性大等优点，而且可以大幅度提高被控温度的技术指标，从而能够大大的提高产品的质量和数量。本系统利用单片机设计一个温控系统,采用80C51单片机为中央处理器，结合高精度数字温度传感器DS18B20，DS18B20在-55～+125°C范围内, 固有测温分辨率为0.5°。采用数字温度传感器DS18B20，因其内部集成了A/D转换器，使得电路结构更加简单，而且减少了温度测量转换时的精度损失，使得测量温度更加精确。数字温度传感器DS18B20只用一个引脚即可与单片机进行通信，大大减少了接线的麻烦，使得单片机更加具有扩展性。由于DS18B20芯片的小型化，更加可以通过单跳数据线就可以和主电路连接，故可以把数字温度传感器DS18B20做成探头，探入到狭小的地方，增加了实用性。更能串接多个数字温度传感器DS18B20进行范围的温度检测。当实际温度低于设定的温度时，采用继电器控制电热丝进行加温；当实际温度高于设定的温度时，关闭继电器，停止加温，进行自然降温。本系统能完成升温和降温控制。 80C51，DS18B20ABSTRACT Today, automation technology, especially the temperature control technology to be at home and abroad a wide range of applications and development. With the development of the national economy, people need to all in the furnace, heat treatment furnace, chemical and biological monitoring of the temperature of the greenhouse and control. single-chip computer to control not only has control of their convenience, simplicity and flexibility advantages, but also substantial increase in temperature was charged with technical indicators, which can greatly improve the quality and quantity of products. The system uses single-chip design of a temperature control system using 80C51 single-chip for the CPU, combined with high-accuracy digital temperature sensor DS18B20, DS18B20 in -55 ~ +125 ° C range, the inherent resolution of 0.5 ° temperature .Digital temperature sensor DS18B20, because of their internal integration of the A / D converter, allows a more simple circuit structure, and a decrease of temperature measurement accuracy at the time of conversion loss, the more accurate temperature measurement. Digital temperature sensor DS18B20 can use only one pin to communicate with the single chip, greatly reducing the wiring trouble, making a more scalable single-chip microcomputer.DS18B20 chip as a result of the smaller, more jumping through a single data line and the main circuit can be connected, it can be made DS18B2