单片机的温室大棚温湿度检测报警系统设计方案

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Abstract

With the development of modern technology, the production of modern life continues to improve, for greenhouse technology to cultivate crops can significantly increase the yield of crops, reducing the agricultural production of the natural environment and climate change request.

However,

the

greenhouse

temperature

and

humidity

requirements for a series of air composition indicators are very strict, and greenhouse modernization must have a set of temperature and humidity measurement and control system, the design is for people living with and the continuous improvement of production level, to the living environment and the requirements of the production environment is particularly important, control temperature and humidity is a typical example, therefore, emerge as the times require an intelligent temperature and humidity detection system in modern life and fast, convenient and reliable detection system, especially in the industrial production if the detection of inaccurate will occur in many production accidents. To provide a better life for modern people to work, scientific research, and more convenient facilities, we must start from the SCM technology, all toward digital control system, intelligent control direction. The design is based on single-chip microcomputer as the core, with the temperature and

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humidity sensor, detecting system and related peripheral circuit, can receive the measurement of environmental temperature and humidity signal, detecting personnel can be displayed by the LCD data, the temperature and humidity of real-time monitoring of the environment. The measurement operation all can be realized through the host computer control software, the measurement signals are temperature and humidity sensor, the circuit is converted to electrical signals, and then the data were processed by conversion to SCM, through the software analysis processing evacuation display device.

The system hardware and software design, including the system of high reliability, simple structure, realizes the automatic control of temperature and humidity. The system also applies RS232 and host machine is connected, can parameters related to the automatic recording of temperature, humidity settings, can also be set at a certain time automatic recording, available in the meteorological observation.

Keywords ：STC89C52 microcontroller, temperature and humidity sensor, LCD display

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目 录

第1章 概述……………………………………………………………………………

1.1 课题研究的背景………………………………………………………………

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1.2 温湿度检测的发展状况以及存在的问题………………………………… 1.3 本课程设计的主要容………………………………………………………

第2章 系统总体方案设计………………………………………………………

2.1 温湿度传感器………………………………………………………………… 2.1.1 DHT11产品概述………………………………………………………… 2.1.2 接口说明…………………………………………………………………… 2.1.3 电源引脚…………………………………………………………………… 2.1.4 串行接口(单线双向>…………………………………………………… 2.1.5 DHT11引脚说明………………………………………………………… 2.1.6 焊接信息…………………………………………………………………… 2.1.7 注意事项…………………………………………………………………… 2.2 RS232接口…………………………………………………………………… 2.3 单片机STC89C52 ……………………………………………………… 2.4 LCD1602………………………………………………………………………

第3章 系统的硬件设计和连接…………………………………………………

3.1 主控模块…………………………………………………………………………… 3.2 显示模块…………………………………………………………………………… 3.3温度和湿度采集模块…………………………………………………………… 3.4键盘设计…………………………………………………………………………… 3.5与上位机相连电路的设计……………………………………………………… 3.6报警电路设计………………………………………………………………………

第4章 系统软件方案的设计………………………………………………………

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