基于STC89C52单片机的蔬菜大棚实时温度测量控制系统 毕业论文+PROTUES 仿真+Keil程序

The Design of DS18B20 Digit Thermometer

ABSTRACT

Vegetables growth is closely related to temperature, vegetable greenhouses is very important in the agricultural development of the technology, it rises to the production of vegetables has a very important role, especially in cold areas, and some vegetables is difficult to adapt to the local temperature, the vegetable greenhouses technology can grow vegetables in this environment, it can not only increase the income of local farmers, at the same time for the development of agriculture in our country also has a great role in promoting, therefore the research of vegetable greenhouse temperature control system is a very meaningful topic.

In order to improve the production effect of vegetable greenhouse, the temperature automatic control system was designed. This paper introduces a kind of miniature single chip microcomputer as the main control device, using AT89S51 as the core controller, using DS18B20 sensors on the greenhouse temperature acquisition, through LCD1602 display to display the current real-time temperature. The control system can store the relevant temperature data in real time and record the current time. Mainly include hardware circuit design and system program design. The hardware circuit includes the minimum system of STC89C52 single chip microcomputer, temperature measurement circuit, real-time clock circuit, LCD display circuit and communication module circuit, etc. The system program mainly includes main program, readout temperature subroutine, calculation of temperature subroutine, key processing program, LCD display program and data storage program, etc.

The design is controlled by single chip microcomputer to realize automatic control of greenhouse temperature. The system is based on the AT89C52 single chip microcomputer, and the temperature is collected and tested by digital and analog methods, and the current temperature is displayed through the display screen. When the collected temperature is higher than the set value of the system, the motor will drive the fan and realize the automatic control of the temperature in the greenhouse.

keywords: Microcontroller Unit ; STC89C52;DS1302; DS18B20; D

目录

摘要 …………………………………………………………………………………I

ABSTRACT II

第一章 设计任务及方案分析 1

1.1 设计任务及要求 1

1.2 设计总体方案及方案论证 1

1.3 温度测量的方案与分析 1

1.31芯片选择 1

1.32实现方法简介 2

1.33 方案设计 2

第二章 芯片简介 4

2.1 STC89C52芯片简介 4

2.11引脚功能说明 4

2.2 DS18B20简介 7

2.21芯片简介 7

2.22 DS18B20外形和内部结构 8

2.24  DS18B20的工作时序 11

2.25 DS18B20与单片机的典型接口设计 12

2．26 DS18B20的各个ROM命令 13

2.3 74HC595简介 15

2.31芯片简介 15

2.32  74HC595特点： 15

2.33  引脚图及各引脚功能 16

第三章 系统硬件电路的设计 17

3.1主控制电路和测温控制电路原理图 17

3.2驱动电路与显示电路模块原理图 17

第四章 软件编程与功能调试 19

4.2 系统软件设计 19

4.2.1 系统软件设计整体思路 19

4.2.2 系统程序流图 20

4.3 系统的程序 23

第四章 仿真分析与实物制作 51

4.1 PROTUES软件简介 51

4.2 实物制作 51

第五章 总结 52

致谢 53