摘要:在现代化农业的飞速发展中，粮仓的温湿度监控已经成为农业生产过程中不容忽视的重要因素。传统意义上的粮仓大多是利用人工进行监控和管理，对温湿度不符合要求的粮仓需要人工透风、降温、除湿等。针对这种完全依赖人工管理的方法，提出了一种智能化监控粮仓温湿度的系统。该系统利用温湿度传感器来采集粮仓内的温湿度情况，将采集到的信号传送给单片机，并在液晶显示屏上显示当前环境温湿度值。通过单片机的分析和决策，启动相应的继电器工作。给出了系统软硬件设计方法，并进行了安装与调试，结果表明系统能实现粮仓温湿度的监控和管理。70530

毕业论文关键词:单片机，温湿度传感器，液晶显示屏, 继电器

Abstract: In the rapid development of modern agriculture, the granary of the temperature and humidity monitoring has become an important factor cannot be ignored in the process of agricultural production. In the traditional sense of the granary is mostly using artificial monitoring and management, on the granary of the temperature and humidity is not in conformity with the requirements drafty, cooling and dehumidification and a series of operations. Against that rely on artificial management method, put forward a kind of intelligent monitoring system of granary temperature and humidity. The system uses temperature and humidity sensors to collect the temperature and humidity within the granary, the collected signal transmitted to MCU, and the current environment temperature and humidity value is displayed on the LCD screen. Through the analysis of single chip microcomputer and decision-making, start the corresponding relay work. System hardware and software design method are presend, and the installation and debugging, the results show that system can realize the granary temperature and humidity monitoring and management.

Keywords: single-chip microcomputer，temperature and humidity sensor，liquid crystal display，relay

目录

1  绪论 1

1.1  研究背景 1

1.2  粮仓温湿度监控系统的发展 1

2  系统整体方案设计 2

2.1 传感器的选择 2

3  系统硬件设计 3

3.1  系统硬件概述 3

3.2  AT89C52的简介及功能介绍 4

3.3  DHT11传感器模块设计 6

3.3.1  DHT11传感器简介 6

3.3.2  DHT11传感器模块的电路设计 8

3.4  1602液晶显示模块设计 8

3.4.1  1602液晶显示屏简介 8

3.4.2  液晶显示模块的设计 8

3.5  继电器模块设计 10

3.6  阈值模块设计 11

3.7  报警模块设计 11

3.7.1  蜂鸣器的简介 11

3.7.2  蜂鸣器的工作原理 12

4  系统软件设计 12

4.1  液晶显示模块设计 13

4.2  传感器模块设计 14

5  系统的仿真与调试