1 Introduction</h5> PA and PV practices depend on the acquisition, transmission and processing of a vast collection of data coming from a large scale, heterogeneous sensor network ( Camilli et al., 2007 ). These characteristics and the obvious need for wireless data transmission immediately raises two issues. The first is energy-related. The challenge is how to obtain sufficient energy and how to manage it, so that all electronic devices can enjoy virtually uninterruptible operation. Previous work ( Morais et al., 2008a,b ) gave valuable information on how to support devices that communicate with each other in an IEEE 802.15.4/ZigBee mesh network with energy harvesting techniques to power data acquisition devices with multiple sensors.</P>The second issue has to do with the normalization and interoperability related to the multiplicity of sensors, sensor output types, multi-vendor data acquisition platforms and network support. In PA/PV practices there are many sensors with different types of output: voltage, current, wired digital (RS-485, SDI-12) and many other types. This diversity affects the way sensors are integrated in a data acquisition network.</P>The multiplicity of incompatible network specifications and distinctive data acquisition platforms make the integration of heterogeneous sensors far from simple ( Tani and Cugnasca, 2005
Computers and Electronics in Agriculture – Elsevier
Published: Jul 1, 2013
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