摘要:在我国的春季和冬季容易发生霜冻，春季发生的叫晚霜冻，由此造成的损失严重，加上近数十年的特殊气候，其危害越来越大。一些传统防霜技术的效果不明显而且还有较大的副作用，比如降低了茶叶的质量和口感，就算是从日本引进的最先进的防霜设备，仍然有受制于气候和地形的缺点。本文提出了一种利用安全电压加热防霜的方法，即金属丝通电后发热将电能转化为热能，弥补低温环境下茶树的热量流失，具有全天候、随时随地工作的特点。
微电子技术的高速发展使得基于单片机的检测与控制技术逐步完善,这一技术在日用电器和工业控制中应用得非常广泛。茶园相关数据的采集和处理可使用AVR单片机和am2301温湿度传感器等组成的检测和控制系统完成，然后由单片机控制加热电路开启与否，从而实现对茶园防霜的检测和控制的智能化。通过本课题的实践，对实验数据的采集和分析来验证电加热法的可行性，为安全电加热法防霜控制技术提供理论基础。20772
关键词：AVR单片机、am2301温湿度传感器、安全电加热技术、茶园防霜
毕业论文设计说明书（论文）外文摘要
Title A control system for tea intelligent frost prevention based on AVR single chip
Abstract
In China, frost occurs easily in winter and spring. The frost in spring named late frost, it can cause severe loses ,combined with special climate in recent decades, the damages caused by late frost become worse and worse .these effects of some traditional frost prevention technology aren’t only invalid but also lead to some secondary actions. For example it reduces the quality of tea, even though the most advanced frost prevention equipment imported from japan is affected by the climate and terrain. This paper puts forward a method of using safety voltage to heat the climate to prevent frost, that is when the wire is powered on, it will emit heat to remedy these heat loses caused by low temperature, thus converts electrical energy into heat energy and it can work at anytime and anywhere .
The rapid development of microelectronics technology leads to the detection and control technology based on SCM gradually improved so it is used very extensive in daily life electrical equipments and industrial control. The collection and processing of the corresponding date of tea garden can be completed by the detection and control system consisted of AVR SCM 、am2301 Temperature and humidity sensors and so on collect and process the corresponding date of tea garden. and then turn on the heating system or not which is controlled by the SCM, thus enable the detection and control of frost tea intelligent. Through the practice of the subject, and the collection and analysis of experimental data to validate the feasibility of electric heating, electric heating security frost control technology to provide a theoretical basis.
Keywords: AVR SCM、am2301 Temperature and humidity sensors、Safety electric heating technology、frost prevention for tea garden
目录
1. 绪论 1
1.1 研究背景及意义 1
1.2 国内外研究现状 1
1.2.1国内情况和分析 1
1.2.2 国外情况和分析 2
1.3课题研究内容和方法 3
2 总体方案的设计 4
2.1 茶园的霜冻原因和防霜技术对比 4
2.1.1茶园的霜冻原因 4
2.1.2 常用防霜方法分析 4
2.2电加热可行性的理论分析和系统总体架构设计 6
2.2.1 电加热可行性的理论分析 6 基于AVR单片机的茶园智能防霜控制系统设计:http://www.youerw.com/zidonghua/lunwen_12672.html