21-02-2011, 11:11 AM
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ABSTRACT
WISENET is a wireless sensor network that monitors theenvironmental conditions such as light, temperature, and humidity. Thisnetwork is comprised of nodes called “motes” that form an ad-hoc networkto transmit this data to a computer that function as a server. The server storesthe data in a database where it can later be retrieved and analyzed via a web-based interface. The network works successfully with an implementation ofone sensor mote.
Introduction:
The technological drive for smaller devices using less power with greaterfunctionality has created new potential applications in the sensor and data acquisitionsectors. Low-power microcontrollers with RF transceivers and various digital and analogsensors allow a wireless, battery-operated network of sensor modules (“motes”) toacquire a wide range of data. The TinyOS is a real-time operating system to address thepriorities of such a sensor network using low power, hard real-time constraints, androbust communications.The first goal of WISENET is to create a new hardware platform totake advantage of newer microcontrollers with greater functionality and more features.This involves selecting the hardware, designing the motes, and porting TinyOS. Once theplatform is completed and TinyOS was ported to it, the next stage is to use this platformto create a small-scale system of wireless networked sensors.
System Description:There are two primary subsystems (Data Analysis and DataAcquisition) comprised of three major components (Client, Server, Sensor MoteNetwork).
Primary Subsystems:There are two top-level subsystems –Data AnalysisData Acquisition
.Data Analysis:This subsystem is software-only (relative to WISENET). It relied on existingInternet and web (HTTP) infrastructure to provide communications between the Client and Servercomponents. The focus of this subsystem was to selectively present the collected environmental datato the end user in a graphical manner.
Data Acquisition:The purpose of this subsystem is to collect and store environmental data for laterprocessing by the Data Analysis subsystem. This is a mix of both PC & embedded system software, aswell as embedded system hardware. It is composed of both the Server and Sensor Mote Networkcomponents.
System Components: