基于单片机的智能温湿控制系统设计.doc

基于单片机的智能温湿控制系统设计摘 要 单片机系统的开发应用将现代的工业测控领域引向了一个新的前景。自动化、智能化均离不开单片机的应用。正是因为单片机具有体积小、价格低的优点，在工业控制、家用电器等领域中得到了很大的应用。系统是一个专门为温室蔬菜大棚温湿度及二氧化碳浓度的检测与控制而设计的智能控制系统。本次设计是基于STC89C52单片机为基础并结合DHT11温湿度传感器和 MG811二氧化碳浓度采集模块的对温室大棚作物的温度、湿度及二氧化碳浓度的智能监控系统，通过对系统的硬件部分与软件部分的设计来达到监控要求。硬件部分实现对温室大棚各个参量检测、显示与无线通信NRF905模块的设计，软件部分主要根据系统的设计思想设计出各个模块的主程序与子程序，并通过C语言实现。该系统具有性价比高、提高设备的使用寿命、提高设备的自动化程度的智能化的优点，能解决实际应用中的问题。 关键词 单片机STC89C52，DHT11,MG811,无线传输 NRF905ABSTRACTSCM system development and application of a new technological revolution to the field of modem industrial measurement and control, automation and intelligence can not be separated from the application of SCM. Microcontroller because of its tiny size and low cost, widely used in household appliances, industrial control and other fields. The system is intelligent control system designed specifically for the detection and control of greenhouse vegetable, greenhouse temperature and humidity and carbon dioxide concentrations. The design of this article is microcontroller-based STC89C52 for the base and the temperature and humidity sensor DHT11 and MG811 concentrations of carbon dioxide acquisition module on greenhouse crops, temperature, humidity and carbon dioxide concentration of intelligent monitoring system, part of the system hardware and software part of the design to achieve monitoring requirements. The hardware part of the various parameters of the greenhouse test, the display design with wireless communications NRF905 module, part of the software system design ideas to design the main program and subprogram of the various modules, and by the C language. The system has the advantages of cost-affective to improve the life of the equipment, the degree of automation of intelligent devices, to solve problems in practical application. Key Words: SCM STC89C52, DHT11, MG811, Wireless communications NRF905目 录 1 绪论 1 1.1 课题背景及意义 1 1.2 国外发展状况 1 1.3 国内发展状况 3 2 系统总体方案 4 2.1 总体方案设计 4 2.2 硬件的选择 6 3硬件系统设计 8 3.1 单片机的确定 8 3.1.1 单片机时钟电路 10 3.1.2