基于IA4421分布式温度和湿度采集系统(英语原文及翻译).doc

Distributed Temperature and Humidity Acquisition System Based on IA4421 Abstract-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 system 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 systems 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; distributed I. INTRODUCTION The short-range wireless transmission technology can get more than one nursery shed parameters 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 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 chip 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 100m ) and distribution, system decide to adopt a short-range wireless communication chip to form a distributed wireless monitoring system , shown in Figure 1 .There are m front-end monitors and a wireless moni