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Multi-sensing node architecture for water quality monitoring

Postolache, O. ; Girão, P.M. ; Dias Pereira, J. M.

Multi-sensing node architecture for water quality monitoring, Proc UPC Workshop Internacial sobre Tecnologia Marina - MARTECH , Cadiz, Spain, Vol. 1, pp. 1 - 4, September, 2011.

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Abstract
This work presents a multi-sensing node architecture
designed and implemented for water quality (WQ) assessment. Each
measuring node includes temperature, conductivity and turbidity
sensing channels. Particular design of the sensing devices and of the
system’s base station software, as well as the periodic calibration of
the sensors followed by upgrading of voltage to water quality
conversion algorithms through the data stored on a SDcard assure
high measurement accuracy. Using a 2XRS232 to Ethernet
converter and an Ethernet bridge, the data from the WQ
measurement node and the node localization, delivered by a GPS
unit, are wirelessly transmitted to the base station. Embedded
software was developed for the PIC18F4520 microcontroller using
the MPLAB C18 Compiler from Microchip to implement data
acquisition, SD card data reading, primary processing, and data
communication. Additional LabVIEW software implemented at the
base station level includes data communication, data logging and
graphical representation of the WQ data from selected monitoring
nodes