1、 中北大学 2013 届英文文献原文及中文翻译第 1 页 共 18 页Distributed Temperature and Humidity Acquisition System Based on IA4421Abstract-Nursery sheds have the characteristics of staying closely, quantity, parameter changing slowly, a small amount of data, so the article presents a distributed centralized monitoring syst
2、em based on a short-range radio transceiver IA4421 chip.The front-end system circuit choose single-chip STC89LE52RC as the control of the core, complete a humidity sensor HSl101, the temperature sensor DS18B20 circuit and IA4421 peripheral circuit design, method of CRC, after completing front-end sy
3、stems and hardware design of data center ,design gives the software design , the corresponding flow chart and some instances. Keywords-IA4421; DS18B20; HSllOl; CRC; wireless transmission; distributedI. INTRODUCTION The short-range wireless transmission technology can get more than one nursery shed p
4、arameters of temperature and humidity and pooled centralized monitoring , this type of scene temperature and humidity parameters changes slowly , it takes more interval time in data acquisition, and the amount of data value for each sample is small ; from a technical perspective ,with the monitoring
5、 system of this type with many monitoring points ,it is more suitable to use the advanced zigbee wireless network . However, examine from an economic point of view, such programs are too much expensive. In this paper a program came up with a distributed centralized monitoring based on the wireless c
6、hip IA4421, the program is suitable for the above-mentioned type of scene, and it has obvious advantages in cost . II. SYSTEM AND HARDWARE DESIGN A. System components With too many distributed multi- monitoring points which the distance is short ( d m?中北大学 2013 届英文文献原文及中文翻译第 17 页 共 18 页Y图6 监测中心系统的流程
7、图其中，第一个字节 A代表前端监测单元的连续的数字，如01H、02 H和03 H。第二个字节 WDH代表温度数据的高8位。第三个字节 WDL代表温度数据的低8位。第四个字节 SHI是转换后的湿度数据。第五个字节 CRC代表剩余的前4个字节的 CRC编码。B.监测中心的微控制器的软件设计监测中心的主要功能是发送查询信号和接收采集的温度和湿度数据。如果这个数据是正确的，数据将通过 RS232被送到主机。监测中心系统流程图如图6所示。在查询信号发出后，监测中心将等待2秒接收数据，如果数据错误或没有接收到，那么系统将记录查询信号和找到错误的原因，尽可能快的使系统顺利进行下去。4.结论本文提出了一种新的
8、低成本分布式温度和湿度采集系统。该系统可以收集不同的地点的数据进行集中监测。实验表明，该系统设计合理，传输的数据准确、可靠，传输距离大约为100米。无线系统具有方便和灵活的特点，可以满足大量的采集现场的需要，前景发展广阔。参考文献1梅立峰，微型计算机原理及接口技术M北京：清华大学出版社，2007.2张克帆，舒华.基于 IA4421的数字无线温度传感器的设计J.现在电子技术，2008，20：189-191.3刘晓阳，周艳涛,基于 DS18B20的单总线的连续数字搜索算法 J.计算技术与自动化，2010,29（1）：38-42.4张平，双定时器555湿度数字测量方法J.自动化技术与应用，2007， （09）.5潘媛媛，闫国政，黄飚，基于 IA4420微型双向射频通信系统J.控制技术，2006,25（5）：81-83.6邹启红，刘岚，赵俊，基于 LPC2131和 IA4421的无线数据采集系统J.信息与电子工程，2009， （02）.中北大学 2013 届英文文献原文及中文翻译第 18 页 共 18 页7町晃，史国良，黄关.单片机的无线通信系统设计J.Microprocesso，2010，(03).
