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基于单片机的水温测量控制及高温报警系统设计.doc
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基于单片机的水温测量控制及高温报警系统设计.doc
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SHANDONGUNIVERSITY OF TECHNOLOGY
毕业设计说明书
基于单片机的水温测量控制及高温报警系统设计
摘 要
现代生活中温度控制系统可以称得上无所不在,热水器系统、空调系统、
冰箱、电饭煲、电风扇等家电产品甚至手持式高速高效的计算机和电子设备等,
均需要提供温度控制功能。本次系统的系统设计可以用于热水器温度控制系统
和饮水机等各种电器电路中。它主要以单片机 AT80C51 为核心,使用单总线温
度转换芯片 DS18B20 实时采集温度,通过 4 个数码管显示温度和 4 个按键实现
人机对话,并通过数码管显示实现对水温的测量,而且利用了语音报警系统实
现高温报警并提供各种运行指示灯用来指示系统现在所处状态,如:温度设置,
加热,停止加热,测温等,整个系统通过使用四个按键来设置加热温度和控制
运行模式。
关键词:单片机 AT89C51,数码管,DS18B20,语音报警
Abstract
In modern life , the temperature control system can be said omnipresent, for
example,water heater system, air conditioning system, refrigerator, electric cooker,
electric fans and other household electrical appliances and even a high performance
computer and electronic equipment are required to provide temperature control
function. This system can be used for water heater temperature control system and
drinking fountains and various electrical circuits. It is mainly on AT80C51
single-chip microcomputer as the core, the use of single bus temperature conversion
chip DS18B20 real-time acquisition of temperature, through four digital display of
temperature and four keys to achieve human-computer dialogue, and through the
digital display of temperature measurement, and the use of the voice alarm system to
achieve high temperature alarm and provide a variety of running indicating lamp is
used to indicate the state of the system now, such as: the set temperature, heating,
heating, temperature. The system uses four buttons to set the heating temperature and
control of operating mode.
Keywords: SCM AT89C5, digital tube, DS18B20, voice alarm
目 录
摘 要 ............................................................................................................................I
ABSTRACT ..................................................................................................................II
目 录..........................................................................................................................III
第一章 绪 论..............................................................................................................1
1.1 课题背景...............................................................................................................1
1.2 温度检测与报警系统的发展情况.......................................................................1
1.3.1 温度参数 ........................................................................................................2
1.3.2 温度检测 .........................................................................................................3
1.3.3 语音报警特点 .................................................................................................3
第二章 系统总体设计..................................................................................................5
2.1 硬件总体设计.......................................................................................................5
2.2 系统设计方案的讨论...........................................................................................6
2.2.1 温度传感器的选择 .........................................................................................6
2.2.2 主控制部分设计 .............................................................................................8
2.3 总结.......................................................................................................................8
第三章 硬件系统设计..................................................................................................9
3.1 单片机最小系统电路...........................................................................................9
3.2 温度检测模块.....................................................................................................11
3.2.1 DS18B20 性能特点与内部结构 ..................................................................11
3.2.2 DS18B20 的测温原理 ..................................................................................16
3.2.3 DS18B20 在测温系统中的应用 ..................................................................17
3.3 语音电路.............................................................................................................18
3.3.1 ISD1420 语音芯片介绍................................................................................18
3.3.2 语音电路录放音的过程 ...............................................................................19
3.4 键盘显示电路及可编程接口芯片 8279 与单片机链接...................................20
3.4.1 8279 芯片的主要特征是 ..............................................................................20
3.4.2 8279 的结构 ..................................................................................................20
3.4.3 8279 的功能说明 ..........................................................................................22
3.5 串行通信电路.....................................................................................................23
3.6 RS232 简介 .........................................................................................................24
3.7 MAX232 简介.....................................................................................................25
3.8 电源电路.............................................................................................................26
第四章 系统软件设计................................................................................................27
4.1 软件开发工具的选择.........................................................................................27
4.2 系统软件设计的一般原则................................................................................27
4.3 系统软件设计的一般步骤.................................................................................27
4.4 软件实现............................................................................................................27
4.4.1 主程序流程图 ...............................................................................................28
4.4.2 温度传感器程序流程图 ...............................................................................28
4.4.3 键盘显示流程图 ...........................................................................................29
4.4.4 通信模块程序设计 .......................................................................................31
总 结..........................................................................................................................32
参考文献......................................................................................................................33
致 谢..........................................................................................................................34
附录一 硬件电路原理图............................................................................................35
附录二 程序源............................................................................................................36
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