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1、兰 州 交 通 大 学 毕 业 设 计 （ 论 文 ）- I -调试文件及程序若需要，联系 QQ 584367157摘 要在粮食的储藏的过程中，由于粮仓温湿度异常而造成粮食变质，带来的经济损失是惊人的。目前我国许多粮食仓储单位采用测温仪器与人工抄录、管理相结合的传统方法，消耗了大量的人力和财力，但是效果不佳，发霉变质等现象大量存在。因此设计智能粮仓温湿度监控系统，提高工作效率，实现粮仓温湿度的实时监控，是仓储单位亟待解决的重要问题。温湿度作为一个重要的物理量，是粮食仓库中最普遍、最重要的工艺参数之一。随着时代的进步、社会的发展、科学技术的不断更新，温湿度测量的准确性要求不断提高，因此温湿度检测
2、也成为一个重要的研究课题。本设计实现的是单片机温湿度测量与控制系统，通过液晶显示器(LCD)显示所测量的温湿度。系统采用集温湿度传感器与 A/D 转换器为一体的 SHT11 芯片，通过单片机处理进行显示，其它模块包括了实时时钟/日期产生电路和超限报警处理电路，对所测量的值进行实时显示和报警处理。本文介绍了基于 ATMEL 公司的 AT89C51 系列单片机的温湿度实时测量与控制系统和显示系统的设计，包括硬件结构原理，并分析了相应的软件的设计及其要点，包括软件设计流程及其程序实现。系统结构简单、实用，提高了测量精度和效率。 关键词：单片机；SHT11；LCD ；DS1302；温湿度控制兰 州 交
3、 通 大 学 毕 业 设 计 （ 论 文 ）- II -AbstractIn the process of grain storage, grain deteriorates due to the abnormal of the barns temperature and humidity, and the economic losses which brought about are amazing. At present many grain storage units in our country use the traditional methods which is combined
4、 of thermometer device, artificial transcription and artificial management, consuming a lot of manpower and financial resources, and the results are poor, the phenomena of mildewing and metamorphism exists in large quantities. Therefore, designing the temperature and humidity monitor system on barn,
5、 improving efficiency and achieving real-time monitoring of barns temperature and humidity, is an important problem demanding prompt solution by storage units. The temperature and humidity is an important physical quantity, is the most common and important technical parameters in grain storages. Wit
6、h the progress of the times, the development of society, science and technology unceasing renewal, the temperature and humidity measurement accuracy requirements continue to increase, so the temperature and humidity detection has become an important research topic.The design and implementation of me
7、asurement and control temperature and humidity is MCU system, through which the temperature and humidity measurement liquid crystal displays (LCD). System adopts set temperature and humidity sensor and A/D converter for SHT11 chip microcontroller processing, through that other modules including real
8、-time clock/date produce circuit and the off-gauge alarm circuit, the value of measurement for real-time display and alarm. The paper introduces the ATMEL company based on AT89C51 single-chip series of temperature and humidity measurement and control system and real-time display system design, inclu
9、ding the hardware structure and principle, and the corresponding software design, including the design of the software and its key process and procedure. System structure is simple, practical, and improve the measuring precision and efficiency. Key Words: MCU, SHT11, LCD, DS1302, Temperature and humidity control兰 州 交 通 大 学 毕 业 设 计 （ 论 文 ）- III -目 录摘 要 .IAbstract .II目 录 .III1 绪论.11.1 问题的提出背景及研究意义.11.2 国内外现状.21.3 课题的研究目的及内容.32 控制系统的硬件电路设计.42.1 整体设计方案.42.2 微控制器模块.42.2.1 复位电路设计.42.2.2 时钟电路设计.52.3 传感电路设计.62.4 显示电路设计.92.5 超限处理电路设计.122.6 硬件电路 PCB 版图设计 .123 控制系统的软件设计.143.1 软件开发平台介绍.143.2 主程序流程设计.
