摘要：目前生活中温室大棚对温湿度的要求很高，传统的温湿度控制方法费时费力，而且效率很低，所以本文设计了一种温室大棚温湿度自动控制系统。首先论述了温室大棚温湿度控制系统的设计及工作原理。然后根据其原理还给出了系统的硬件电路，通过软件设计仿真电路。该系统以单片机AT89C52为控制中心，通过键盘输入预设值，采用SHT71温湿度芯片检测温湿度，通过LCD12864液晶显示屏实时显示温湿度的数值。当温度或湿度超过允许范围时，电风扇启动来调节温湿度；当温度低于预设值时，LED亮起，模拟加热，当湿度低于预设值时，电机开始转动，模拟加湿，从而实现对整个温湿度控制系统的管理。该系统精度高、简单、可靠、易于管理。56885

毕业论文关键词：温湿度控制系统，预设值，单片机

Abstract：Greenhouse has a high requirement on the temperature and humidity in the life, the traditional method of temperature and humidity control is time-consuming, and inefficient. So an automatic control system for temperature and humidity detection of greenhouse was designed. The design and operating principle were firstly discussed in this paper. Based on that, hardware circuit and software program were designed. AT89C52 was chosen as the central unit in this system. The default limits of temperature and humidity were input by keyboard. The real-time temperature and humidity were detected by SHT71 and displayed on 12864 LCD. When the temperature or humidity exceeds the allowable range, the fans start to regulate temperature and humidity. When the temperature is lower than the preseted value, LED shines to simulate the process of heating. And the motor starts to rotate when the humidity is lower than the preseted value. In these ways,  temperature and humidity management are fulfilled in the designed system. The system is precise, simple, stable and easy to manage.

Key Words: Temperature and humidity control system, defaults ,SCM

目   录 

1 前言 4

1.2 论文主要内容 4

2 温室大棚系统的硬件设计 5

2.1 总体方案的设计 5

2.1.1 设计思想 5

2.1.2 方案的选择与评定 5

2.1.3 系统组成框图 5

2.2 温湿度测量模块 6

2.2.1 温湿度芯片的选择 6

2.2.2 温湿度测量电路 8

2.3 单片机最小系统模块 9

2.3.1 单片机的选择 9

2.3.2 电路组成 9

2.4液晶显示模块 11

2.4.1液晶显示屏的选择 11

2.4.2 液晶屏显示电路 13

2.5键盘模块 13

2.6 调节控制模块 14

2.6.1 温度调节电路 14

2.6.2 湿度调节电路 15

3系统总体流程图 16

3.1 LCD液晶显示程序设计 16

3.2 测量温湿度程序设计 17

3.3 键盘扫描程序设计 18

4 系统仿真与调试 19

4.1 软件调试 AT89C52单片机温室大棚温度控制系统设计+电路图:http://www.751com.cn/zidonghua/lunwen_61466.html