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论文编号:ZD1269 论文字数:21582,页数:55 附原理图
摘 要
在粮食的存运和采购中，其水分含量及保存温度是两个很重要的参数。为了把含水量控制在最佳的收购和储藏范围内，避免造成粮食霉烂等不必要的经济损失，满足粮食储藏部门及专业户的要求，迫切的需要一种测量可靠、操作方便的谷物水分及温度测定装置。以往采用的谷物水分测量仪，测定的规则复杂、时间长且造价高，很难满足要求，因此我们需要一种造价低廉、使用方便且测量准确的温度测量仪。
本系统由AD590及RHU-223进行信号采集，经过AD574对采集到的模拟信号进行数模变换，在单片机AT89C51内部进行数据处理，然后进行显示，附加的有软件设计等。
通过计算机控制可以实现人机分离，节省人力物力，且本设计造价低，可控
性强，比较理想的温度检测系统。
关键词： 单片机 传感器 A/D转换 显示
Monitor of Temperature and Humidity In Granary
Abstract
In food save carried with purchase, it is humidity contains the deal and keeps the temperature is two very important parameters. For controlling to shout the amount of water within the scope of procure best with store, avoid resulting in the otiose economy in spoiled by mildew etc. in food lose, satisfying the food the hoard the request between section and profession door, crying need a kind of diagraph is dependable and operate the convenient corn humidity and temperature measurements device. Former adoptive of corn humidity measure ,the rule of the measurement complicacy, time long and build the price high, very difficult satisfy the request, therefore we need a kind of building the price cheap, usage convenience and measure accurate degree of humidity measure .
According to single a machine logarithms word signal of high sensitive with can control the sex, the degree of humidity of spreads to feel the machine can produce the emulation signal, with A| D emulation arithmetic figure conversion an a set of examinations for of function, I designing with AT89c51 for core system, among them include the power supply the system, A/ D conversion, single a machine, reply an electric circuit, temperature examination and control, keyboard and manifestation and reports to the police the electric circuit, system software etc. part of designs.
Passing the calculator control can realize person''s machine separates, save the manpower material resources, and this design builds the price low, can control
The sex is strong, ideal temperature degree of humidity examination system.
Keywords：Microchip Sensor A/D Converter
目录
第一章 总 述 4
引言： 4
1.1检测系统的技术指标及功能 4
1.2测试检测控制系统的技术要求。 6
1.3应用现场环境分析 6
1.4本设计的指导思想 7
第二章 方案设定及论证 8
2.1传感器的原理及主要技术参数 8
2.2 温度传感器的选用 10
2.3单片机选择 11
2.4信号采集部分 12
第三章 系统整体设计 14
3.1系统程序框图： 14
3.2信号采集 14
3.2.1 温度传感器 14
3.2.2 多路开关 16
3.3硬件系统分析 16
3.3.1 A/D转换 16
3.3.2单片机AT89C51 20
3.4.1显示部分 27
3.4.2报警系统 32
3.4.3复位电路 32
3.4.5通讯 37
3.4.6虫害检测报警系统 38
第四章 软件设计 39
主程序 46
参考文献 56
结束语 57
