-基于51单片机温湿度采集控制系统 - 图文(5)

北方民族大学学士学位论文

第6章 结论与展望

本系统以AT89C52单片机为核心部件的控制系统，利用软件编程，最终基本上实现了各项要求。虽然本系统设计还存在某些不足，比如温湿度测量不够精确。不过本系统大体能反映出系统设计的目的和要求，与预期的结果相差不多。

经过几个月的奋斗，从确定题目，到后来查找资料，理论学习，实验编程调试，这一切都使我的理论知识和动手能力有了很大的提高。学会了对一项设计如何系统设计：首先，要分析需要系统设计的系统要实现什么功能，需要什么器件；然后，针对系统设计购买相应的硬件，选用硬件时不仅要选用经济的，更重要的是如何能更精确更方便的完成系统的要求；再次，对各个硬件的软件实现要弄清楚，如何更好的实现各个硬件的协调，更好的通过主控制器件实现硬件的功能。最后，通过各种测试与调试，让系统设计更好的完成系统要求。

但此系统设计中也存在一定的不足，就比如说对湿度的控制方面，由于温度时刻都在发生着变化。而湿度的变化又大体上取决于温度。因而对于湿度的控制有点困难。

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基于51单片机温湿度采集控制系统

参考文献

[1] 陈明荧.8051单片机课程系统设计实训教材[M]. 北京：清华大学出版社，2003． [2] 徐新艳.单片机原理、应用与实践[M]. 北京：高等教育出版社，2005．

[3] 吴金戌，沈庆阳，郭庭吉.8051单片机实践与应用[M]. 北京：清华大学出版社，2002. [4] 王千.实用电子电路大全[M]. 电子工业出版社，2001.

[5] 冯博琴.微型计算机原理与接口技术[M]. 北京：清华大学出版社，2004. [6] 张毅刚.MCS-51单片机应用系统设计[M]. 哈尔滨工业大学出版社，2004. [7] 刘坤.51单片机应用系统典型模块开发大全[M].中国铁道出版社，2011 [8] 郭天祥.51单片机C语言教程[M].电子工业出版社，2010. [9] 黄俊.电力电子技术[M].机械工业出版社，2009.

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北方民族大学学士学位论文

致 谢

毕业在即，而毕业论文则是毕业前的最后一环，也是非常重要的一环。为期几个月的毕业系统设计过程中，冯翼老师给与了我很大帮助，无论是从实习期间的懵懂状态，再到硬件系统设计以及毕业论文的完成后的略有小成，我都会有深深的感慨。在做毕业系统设计的过程中，是冯翼老师给我指明了思路，包括硬件采购，电路连接以及软件程序系统设计等，都给我提供了相当大的帮助。在此，特意对冯翼老师表示深深感谢。

同时还要对学校表示感谢，是学校给我们提供了一次难能可贵的机会。还有学校从硬件方面也对我们能帮助很大，大大的方便了我们完成毕业系统设计。

总之，无论是从老师还是到学校。本次毕业系统设计过程中我受到了很大的帮助和启发。没有你们，我的毕业系统设计就坚持不下来。感谢你们，有了你们，我受益匪浅。

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基于51单片机温湿度采集控制系统

附 录

附录A 外文文献

Introductions to PID Controllers and Intelligent

Industrial automation level has become a measure of professions modernization level is an important symbol. At the same time, the development of the theory of control also experienced the classical control theory and modern control theory and intelligent control theory of three phase automatic control system can be divided into the open loop control system and closed-loop control system. A control system including the controller, sensors, actuators, and transmitter input and output interface. The output after output interface, actuators, add to the control system, Control system, the accused, the transmitter, through after sensor input interface to controller. Different control system, its sensors and actuators, the transmitter is not the same. At present, the PID control and controller or intelligent instrument has many PID controller in the engineering practice, the products have been widely applied, there are all sorts of PID controller products, companies are developed with PID parameter self-setting function of intelligent regulator (intelligent regulator), including the PID controller is adjusted by intelligent automatic adjustment or calibration, the adaptive algorithm is proposed to realize. Have realized using PID control pressure, temperature, flow, liquid level controller, can realize PID control function of the programmable logic controller (PLC), and can realize PID control PC system, etc.

PID controllers can be stand-alone controllers (also called single loop controllers), controllers in PLCs, embedded controllers, or software

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北方民族大学学士学位论文

in Visual Basic or C# computer programs.

PID controllers are process controllers with the following characteristics:

_ Continuous process control

_ Analog input (also known as “measurement” or “Process Variable” or “PV”)

_ Analog output (referred to simply as “output”) _ Setpoint (SP)

_ Proportional (P) , Integral (I) , and/or Derivative (D) constants Examples of “continuous process control” are temperature, pressure, flow, and level control.for example, controlling the heating of a tank. For simple control, you have two temperature limit sensors (one low and one high) and then switch the heater on when the low temperature limit sensor turns on and then turn the heater off when the temperature rises to the high temperature limit sensor. This is similar to most home air conditioning & heating thermostats.

In contrast, the PID controller would receive input as the actual temperature and control a valve that regulates the flow of gas to the heater. The PID controller automatically finds thecorrect (constant) flow of gas to the heater that keeps the temperature steady at the

setpoint.Instead of the temperature bouncing back and forth between two points, the temperature is held steady. If the setpoint is lowered, then the PID controller automatically reduces the amount of gas flowing to the heater. If the setpoint is raised, then the PID controller automatically increases the amount of gas flowing to the heater. Likewise the PID controller would automatically for hot, sunny days (when it is hotter outside the heater) and for cold, cloudy days.

Intelligence and intelligent systems can be characterized in a number of ways and along a

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