基于单片机的温度制系统计毕业论文.docx

摘要温度是表征物体冷热程度的物理量，是工农业生产过程中一个很重要而普遍的参数。由于温度测量的普遍性，温度传感器的数量在各种传感器中居首位。温度控制的发展引入单片机后，可以降低对某些硬件电路的要求。基于单片机的温度控制系统，可以实现对温度的精确控制。本文以温室为研究对象，以AT89C51单片机为核心所实现的温度控制系统具有自动完成数据采集、数据处理、数据转换控制、键盘终端处理及显示的功能。当实际温度低于设定值，PTC进行加热，反之PTC就停止加热。实际温度超上限或者低下限时，系统自动报警。温度控制采用的是双位控制，简单易行，在精度要求不是特别高的温室，可行度很高。 最后对系统进行调试并在PROTEUS里仿真，结果表明该系统原理可行。又在一个小空间进行试验，误差在1℃左右，结果符合预期。运行稳定、控制效果好、性价比高。关键词：单片机，温度控制，DS18B20，温室AbstractTemperature is thephysical quantity characterizing the temperature extent of objects;it is an important and general parameter in industrial and agricultural production process. Due to the universality of temperature measurement, the quantity of temperature sensor occupies first place among various sensors. It can lower the requirements of some circuits after introducing the development of temperature control into microcontroller unit. It can also achieve precise control of the temperature, based on the temperature control system of microcontroller unit.In this article, greenhouse is the object of study. The temperature control system which takes AT89C51 as the core has the function of automatic complete data acquisition, data processing, data conversion control, keyboard terminal processing and display. When the actual temperature is below the set value, PTC starts heating, on the contrary, it stops heating. When the actual temperature exceeds the upper or lower limit, the system gives an alarm automatically. Temperature controlis simple and easy with a dual position control. It is highly feasible in the greenhouse where the accuracy requirements are less strict.The results shows the principle is available after debugging the system and simulating in Proteus, we also conducted the same trial in a smaller room, and the error is about 1℃, which is in line with expectations. The system is stable, easy to control and cost-effective.Keyword: microcontroller unit, temperature control,DS18B20, greenhouse第一章 绪论1.1课题研究背景及意义温度是表征物体冷热程度的物理量，是工农业生产过程中一个很重要而普遍的参数。温度的测量及控制对保证产品质量、提高生产效率、节约能源、生产