蔬菜大棚温湿度智能控制系统

论文编号:ZD1289  论文字数:23321,页数:70  附开题报告，外文翻译，大图

摘要

  本设计是基于单片机控制的蔬菜大棚温湿度智能控制系统，主体由单总线温度传感器DS1820、A89C51单片机、数据存储器6264、8255接口芯片，湿度传感器、报警电路以及锁存器74LS373构成。此系统具有运行速度快，传感器安装便利，精度高，稳定性强等优点，其最主要技术运用了单总线传输。此系统不仅仅适用于蔬菜大棚的温度控制，也适用于一些对温度要求较高的工艺，可以广泛应用于这些工业生产，普及性较强。此系统对蔬菜大棚进行多点温度巡回检测控制，而且能自动判断温度是否超标，并且可以智能的控制相关设备的启动，可靠性比较强。
 本设计由硬件和软件两大部分构成。其硬件电路部分的设计包括：单片机的选择、数字和模拟量通道的设计以及温湿度测量和报警电路的设计部分。软件又包括主程序，单总线通信协议子程序，DS1820读写子程序、显示刷新子程序、报警处理子程序等。
关键词：单总线；单片机；温湿度控制；DS1820；数据存储器；锁存器
 
 

ABSTRACT

 The design which controls the humidity and temperature of the greenhouse is based on the single chip computer. Its body is made up of the temperature sensor DS1820, the single chip computer A89C51, the data-carrier storage 6264, the connection chip 8255, the humidity sensor, the alarm circuit and latch 74LS373. This system has some advantages, such as the high running speed, the convenient installment of the sensor, the high precision, the good stability and so on. And its main technology is the 1-wire transmission. This system is not only suitable for the temperature control of vegetables greenhouse, but also for the technology of some higher requests to the temperature, and it may widely apply to these industrial productions, and it has good popularization. This system carries on the multi-spots temperature tour test control to the vegetables greenhouse, and can automatically judge the temperature whether it exceeds the allowed figure, and may start up the intelligent control equipment, and it has a good reliability.
 The system is composed of the hardware and software. The design of the hardware circuit includes: the choice of single chip computer, the design of the I/O and A/D, the test of the humidity and temperature and the design of the alarm circuit. The software part includes: the main procedure, the subroutine of the correspondence agreement of the 1-wire, the DS1820 read-write subroutine, the subroutine of the demonstration renovates, the subroutine of the alarm processing and so on.
Keyword: 1-wire; single chip computer; temperature and humidity control; DS1820; Data-carrier storage; Latch

目录

引言………………………………………………………………………1
1 概述…………………………………………………………………2
1.1 温室计算机控制的概况…………………………………………2
1.2 用户对该系统的要求……………………………………………2
1.3 系统的硬件组成框图……………………………………………2
1.4 系统的工作原理…………………………………………………3
2 系统的硬件组成电路设计…………………………………………4
2.1 系统主控制器部分设计…………………………………………4
2.2 数据存储器的扩展………………………………………………10
2.3 主控制器的并行接口扩展………………………………………12
2.4 LED显示器………………………………………………………14
2.5 A/D转换接口……………………………………………………16
3 一总线接口…………………………………………………………22
3.1 单总线技术概述…………………………………………………22
3.2 单总线芯片的硬件结构…………………………………………23
3.3 单总线芯片的供电………………………………………………23
3.4 单总通信的ROM命令…………………………………………24
4 单总线数字温度传感器DS1820和湿度检测电路………………27
4.1 DS1820概述………………………………………………………27
4.2 DS1820 的主要特性……………………………………………27
4.3 DS1820 内部结构………………………………………………27
4.4 DS1820的工作原理……………………………………………28
4.5 DS1820使用中注意事项………………………………………30
4.6 湿度检测电路……………………………………………………30
4.7 报警电路…………………………………………………………31
5 系统的软件设计……………………………………………………32
5.1 设计方法…………………………………………………………32
5.2 主程序的分析与说明……………………………………………32
5.3 主程序区…………………………………………………………32
5.4 子程序区…………………………………………………………35
6 电路设计中的抗干扰措施…………………………………………64
7 技术经济分析………………………………………………………67
8 结论…………………………………………………………………68
致谢……………………………………………………………………69
参考文献………………………………………………………………70