期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2013
卷号：2
期号：10
页码：4866
出版社：S&S Publications
摘要：Precision agriculture is an innovative technology, wherein the crops are cultivated in controlledenvironment. Emphasizing the need of precision agriculture, an electronic system is designed to provide thermalcomfort to the crops of polyhouse environment, wherein an ubiquitous technology, Wireless Sensor Network(WSN) is deployed. To realize the establishment of wireless sensor network, a wireless sensor node is designedusing embedded philosophy and presented in this paper. Availing promising features of AVR ATmega 8Lmicrocontroller, the wireless sensor node is designed to monitor the thermal status of the polyhouseenvironment in spatio-temporal domain. The precision temperature sensor LM35 is employed to read thethermal status. Moreover, the signal conditioning circuit is wired about TLC 271, which operates on one powersupply only and exhibiting very high input impedance with rail to rail input. An analog signal is digitized withon chip analog to digital converter with 10 bit resolution. The controlling unit is also designed to activate theheater as well as ventilators. To ensure wireless communication, the Zigbee model from Digi corporation isdeployed as RF module. The sensor nodes are calibrated to the real unit and its performance is confirmed bycomparing the results with standard digital thermometer. Each sensor node is assigned with network ID and itcommunicates the data with the respective ID in star topology. The present wireless sensor network is deployedin the polyhouse to monitor thermal status. It works continuously and precisely to hold control on temperatureof the domain with great reliability.
