DESIGN AND IMPLEMENTATION OF SENSOR NODE FOR WIRELESS SENSORS NETWORK TO MONITOR HUMIDITY OF HIGH-TECH POLYHOUSE ENVIRONMENT

Wireless Sensors Network is a novel field shows tremendous application potential. To monitor the environmental parameters of high-tech polyhouse the Wireless Sensors Network (WSN) is developed. The heart of this ubiquitous field is the Wireless Sensor Node. Moreover, the field of microcontroller based embedded technology is innovative and more reliable. Therefore, based on an embedded technology and the RF module Zigbee a wireless senor node is designed about highly promising AVR ATmega8L microcontroller and implemented for WSN development. Recently, the modern agriculturists are demanding sophisticated instrumentation for measurement and control of environmental parameters of the polyhouse. To enhance crop yield one has to provide controlled environment to the crop. The humidity is important parameter, which plays vital role on the crop yield. Therefore, a Wireless Sensors Network (WSN) is designed and implemented for monitoring of humidity of polyhouse and the results of implementation are interpreted in this paper

<span style="font-size: 21.5pt;mso-bidi-font-size:14.5pt;font-family:"Times New Roman","serif"">AC electrical conductivity study of Nd^{<span style="font-size:16.0pt; mso-bidi-font-size:9.0pt;font-family:"Times New Roman","serif"">3</span>}^{<span style="font-size:17.5pt;mso-bidi-font-size:10.5pt;font-family:"Arial","sans-serif"">+</span>}<span style="font-size:17.5pt;mso-bidi-font-size:10.5pt;font-family:"Arial","sans-serif""> <span style="font-size:21.5pt;mso-bidi-font-size:14.5pt;font-family: "Times New Roman","serif"">substituted Zn-Mg ferrite system </span></span></span>

419-421<span style="font-size: 16.0pt;mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">Compositions of polycrystalline ferrites, ZnxMg1-xFe2-yNdyO4 (x <span style="font-size:19.5pt;mso-bidi-font-size:12.5pt;font-family: " times="" new="" roman","serif""="">= <span style="font-size:16.0pt;mso-bidi-font-size: 9.0pt;font-family:" times="" new="" roman","serif""="">0.00, 0.20, 0.40, 0.60, 0.80 and 1.00; y <span style="font-size:19.5pt;mso-bidi-font-size:12.5pt; font-family:" times="" new="" roman","serif""="">= <span style="font-size:16.0pt; mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">0.00 and 0.10), have been prepared by standard ceramic method. On characterization by standard tools like X-ray diffraction, SEM and IR absorption, the formation of single phase cubic spinels has been confirmed. Dielectric constant (ϵ') and dielectric <span style="font-size: 16.0pt;mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">loss (tanδ) were measured with variation of applied frequency in the range from 20 Hz to 1 MHz at room temperature. The plots of ϵ<span style="font-size: 16.0pt;mso-bidi-font-size:9.0pt;font-family:" arial","sans-serif""="">' and tanδ show sharp dispersion at lower frequencies and almost level off at higher frequencies. This is attributed to the interfacial polarization. From compositional dependence study, it was found that the dielectric constant (ϵ') follows increasing trend with increasing zinc concentration whereas decreasing trend with Nd<span style="font-size:13.0pt;mso-bidi-font-size:6.0pt; font-family:" times="" new="" roman","serif""="">3+ substitution. This is explained by <span style="font-size: 16.0pt;mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">conduction mechanism wherein population of hopping electrons at crystallographically equivalent site, octahedral <span style="font-size:15.0pt;mso-bidi-font-size: 8.0pt;font-family:" arial","sans-serif""="">(B) <span style="font-size:16.0pt; mso-bidi-font-size:9.0pt;font-family:" times="" new="" roman","serif""="">site, is considered. </span