摘 要粮仓作为储存粮食的重要场所，担负着粮食储存的重要任务。粮食在储存过程中受很多因素的影响，其中最主要的两个因素就是温度和湿度。为了减少粮食在储存过程中的损失就需要对粮仓的温湿度进行监控，并且在温湿度发生变化时控制设备将它恢复到预设的数值。75811

本文设计了一种基于单片机和传感技术的温湿度监控系统。主要采用AT89S52单片机和DHT11温湿度传感器,系统主要包括单片机、显示模块、温湿度传感器、报警蜂鸣电路、控制设备等5个部分。系统主要实现的功能是人工设定粮仓储存粮食的温湿度，当粮仓中的温湿度与设定的数值不符时，报警电路将会报警，此时控制设备也会工作，直到将温湿度控制到预设的值时系统才会恢复正常工作。本次设计主要有反应快速，抗干扰能力强，价格低廉等优点

毕业论文关键词：单片机  温湿度监控

Granary temperature and humidity monitoring system based on single chip design

Abstract Granary storage food as an important place, assuming the important task of grain storage。 Grain in the storage process is affected by many factors, one of the most important two factors is the temperature and humidity。 In order to reduce the grain loss in the storage process need to monitor granary of temperature and humidity, and changes in temperature and humidity control device would revert to its default value。

This paper designs a temperature and humidity monitoring system based on single chip microcomputer and sensor technology。 Mainly USES the AT89S52 single chip microcomputer and DHT11 temperature and humidity sensor, the system mainly includes single chip microcomputer, display module, temperature and humidity sensor, alarm buzzer circuit, control equipment, five parts。 System main function is to manually set the temperature and humidity of the granary storage of grain, when the granary of temperature and humidity is not in conformity with the set value, alarm circuit will warning and the control equipment will also work, until the temperature and humidity control to the default value when the system will resume normal work。 This design mainly has quick response, strong anti-jamming capability, price is low wait for an advantage

Key  words: single chip microcomputer   temperature and humidity monitor

目录

摘要 II

Abstract III

目录 IV

1绪论 1

1。1背景 1

1。2 研究现状 1

1。3 研究内容 2

2系统的总体设计 3

2。1 系统的工艺要求 3

2。2 系统的方案选择 3

2。3 系统的工作流程 4

2。4 本章小结 5

3．硬件设计 6

3。1 控制器选择 6

3。2测量电路 7

3。3 复位电路 9

3。4 时钟电路 9

3。5 显示电路 10

3。6 温湿度设置电路 15

3。7 报警电路 16

3。8 控制设备 17

3。9 硬件电路总原理图