摘    要：仓贮环境对于存储货物的品质来说至关重要，而温湿度又是衡量仓贮环境的重要参数指标，异常的温湿度都会对货物品质产生影响，导致企业的利益受损。传统的人工测量方法不仅工作繁重而且误差较大，无法满足现代化仓贮的需要。

为了解决以上问题，本文设计了一种无线温湿度仓贮监测系统，该系统使用AT89C51单片机作为控制单元，SHT15芯片作为温湿度数据采集模块，LCD1602作为下位机的显示模块，无线收发模块使用NRF905射频芯片芯片，MAX232作为PC端和下位机的串行接口。最后，温湿度信息将被传输到远程PC端，上位机软件将以图表的形式直观显示温湿度的变化。

本文的研究内容主要包括以下几点：

（1）温湿度数据采集：采用SHT15数字温湿度传感器进行温湿度数值的采样，该传感器自动将采集到的温度和湿度值发送给单片机保存。单片机在进行精度调整和温度补偿后，将当前的温湿度值在LCD屏上显示，并能根据环境温湿度的变化而实时改变显示的数值。

（2）无线数据传输：无线数据传输功能主要依靠NRF905射频收发芯片来实现，该模块将单片机中的温湿度数据通过无线传输的方式发送到远程接收端，接收端将数据传入到计算机，从而完成了数据的远程通信。

（3）上位机软件：设计基于LABVIEW平台的上位机软件，读取下位机中的温湿度数值并绘制出变化曲线，同时将温湿度值与设定值进行比较，当温度或者湿度超过预设的范围时，红灯点亮并发出报警声音。

关键词：AT89C51；温湿度传感器；无线传输；仓贮

Abstract：Storage places are essential for the quality of goods. Likewise temperature and humidity are important parameters to measure storage environment. High temperature and humidity will affect the quality of goods stored, resulting in damage to the interests of enterprises. The traditional method is tedious and have many errors, which cannot meet the demand of recent storage.

To overcome the above problem, this paper we proposed a wireless real-time storage temperature and humidity monitoring system. The system uses AT89C51 microcontroller as the control unit, SHT15 chip as the temperature and humidity data acquisition module, LCD1602 as display module . Wireless transceiver module uses NRF905 RF chip and MAX232 chip is used as PC serial interface. Finally, the temperature and humidity information will be transmitted to the remote end of the PC, in this thesis, we focused on the following; Temperature and humidity data acquisition. The values are sampled by using SHT15 digital temperature and humidity sensor. The sensor will automatically collect temperature and humidity values and sent to the MCU in preservation. After precision adjustment and temperature compensation, temperature and humidity values will be displayed on the LCD screen, and according to the change of environmental temperature and humidity, the displayed value can change in real-time. Secondly, data transmission function mainly depends on the NRF905 RF transceiver chip. The module send the temperature and humidity data in the single-chip to the remote receiver via wireless transmission and the receiver transmit the data to a PC to realize the long-distance communication of data. Finally, a system based on LABVIEW platform reads the temperature and humidity data in numerical machine and display the result graphically. At the same time, the temperature and humidity values are compared with the set value. If the temperature and humidity exceeds the set range, the alarm will be sound.

Keywords：AT89C51；Temperature and humidity sensor；Wireless transmission；storage

目录

第一章 绪论 1

1.1 课题研究的目的和意义 1

1.2 温湿度监测的研究现状 1

1.3 本文的主要研究内容 3

第二章 系统总体结构设计 4