基于某单片机的燃气热水器温度控制系统设计

毕业论文题目基于单片机的燃气热水器温度控制系统设计

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本人的学位论文是在导师指导下独立撰写并完成的，学位论文没有剽窃、抄袭、造假等违反学术道德、学术规和侵权行为，否则，本人愿意承担由此而产生的法律责任和法律后果，特此重声明。

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摘要

随着现代居民生活消费水平的不断提高，人们对生活质量的要求也越来越高。热水器作为家居生活中非常重要的一部分，用户对热水器的功能需求也越来越智能化。燃气热水器作为热水器的一种，以其加热速度快、体积小、安全、节能等优点，深受广大消费者的喜爱。而目前大多数燃气热水器的智能化程度还较低，处于手动调温阶段，且水温不能实时显示，用水量和用气量不能实时控制，这使消费者的用户体验水平大大降低。

根据现今燃气热水器中存在的不足，向着智能调温方向发展，本文设计了燃气热水器的恒温控制系统，概括起来有以下几点：

(1)用8位单片机89S51和DS18B20温度传感器，提出了水温实时监测的温度控制系统，该系统相比16位的单片机、热敏电阻和A/D转换器构成的温度数据采集系统具有更高的性价比。

(2)根据温度传感器采集到的温度数据，经过数据转换，与设定温度数值进行对比，再通过DAC0832数模转换为不同的电流，从而控制燃气比例阀的大小，调整加热的力度，进一步实现温度的自动控制。

(3)采用数字PID程序控制，提高了温度的控制精度，并能实现温度的连续可调。

(4)加入了LCD1602液晶显示屏，用于出水温度的实时显示；并加入了看门狗和声光报警子电路，提高了热水器的安全性。

(5)对设计程序进行了工程样板制作。

关键词：燃气热水器；单片机；温度控制；DS18B20

Abstract

With the improvement of the consumption level of modern residents, customer's requirements of life quality are getting higher and higher.A s a very important part of home life, the water heater's function is also more and more intelligent.Gas water heater as one of water heater, with its heating speed, small size, safety and energy saving, is very popular by the vast number of consumers.At present, most of the gas water heater is still relatively low-degree of intelligence, only can adjust the temperature by hands, and the water temperature can not be displayed at any time, the weight of water and gas can not be control automaticly, therefore these make the user's user experience level greatly reduced.

According to the shortcomings of gas water heater,this paper designed

a constant temperature control system for gas water heater:

(1) In this paper, 8-bit single-chip 89S51 and DS18B20 temperature sensors were used, and the temperature control system of real-time monitoring of water temperature was put pared with the temperature data acquisition system, which was constituted of 16-bit microcontroller, thermistor and A/D converter, the system of this article is cost-effective.

(2) According to the temperature data of temperature sensor, through

the data conversion, and compared with the set temperature value, and then through the DAC0832 digital converter into the different electric current value, the size of gas proportional valve can be control. Finally, the heating force can adjust so that achieve the temperature of the automatic control.

(3) The temperature control system used the digital PID program control, improved the temperature control accuracy, and can achieve continuous adjustable temperature.

(4) A 1602 LCD screen was joined in the temperature control system for the real-time display of water temperature; and watchdog and sound and light alarm circuit were set to improve the safety of water heaters.

(5) The design process was made into the project model, and was debugged successful.

Key words: Gas water heater; Single chip; Temperature control; DS18B20