毕业设计说明书
学生姓名：  XX 学  号：  XXXXXXXXX     
学  院：    计算机与信息工程学院                           
专业年级：      XX级通信工程                       
题    目：RS485数字温湿度传感器的设计与实现                       
指导教师：            朱江章（副教授）       
评阅教师：            徐卓农（副教授）                     
2016年5月   
RS485数字温湿度传感器的设计与实现
摘  要：本文采用51系列单片机AT89C51和DHT90设计了一种RS485数字温湿度传感器，该系统设计主要包含硬件系统设计和软件系统设计。硬件系统主要由时钟发生电路、单片机控制电路、LCD显示电路、声光报警电路、键盘控制电路和温湿度检测电路等部分组成。该传感器主要采用AT89C51来进行控制，采用C语言进行软件设计，以Proteus和Keil为主要设计工具。经仿真调试表明，该系统可以设定温湿度的标准值并显示当前环境的温湿度；可根据实际需求使用按键调整温湿度的标准值；当前环境的温湿度超过设定的标准值时，系统会发出声光报警信号。该数字温湿度传感器具有控制简单，稳定性高，性价比高，安全实用等特点，具有一定的推广价值。
    中南林业科技大学怎么样 关键词：AT89C51；DHT90；温湿度传感器；电路
The design and implementation of a digital temperature and humidity sensor based on the RS485
Abstract：This paper designed a digital temperature and humidity sensor based on the R
S485, the digital temperature and humidity sensor design is mainly includes hardware system and software system design. The hardware system is mainly composed of the clock generating circuit, single chip microcomputer control circuit, LCD display circuit, sound and light alarm circuit, keyboard control circuit and temperature and humidity detection circuit and other parts. The sensor is mainly AT89C51 to control, using C language for software design, and Proteus ,Keil as the main design tool. The simulation debugging showed that the system can be set to standard values of temperature and humidity, and displays the current temperature and humidity of the environment; using standard buttons to adjust the temperature and humidity values based on actual demand; the current standard value of the environmental temperature and humidity exceeds a set time, the system It will be audible alarm signal. The sensor is simple, high stability, high cost performance, safe and practical characteristics, has a certain popularization value.
Key Words： AT89C51; DHT90; Temperature and Humidity Sensor; Circuit
1.2数字温湿度传感器比较与特性分析
1.3 论文结构与篇章安排