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Development of New Generation Low-Cost Conductivity System for Crop Irrigation Monitoring

Authors:
Daniel A. Basterrechea
Sandra Sendra
Sandra Viciano-Tudela
Jaime Lloret

Keywords: Conductivity sensor; urban agriculture; irrigation monitoring

Abstract:
The development of smart cities has been boosted in recent years. This means improvements for urban agriculture. In this paper, we present a low-cost system for monitoring conductivity in the irrigation system of urban agricultural plots. For this purpose, an inductive, two-coil sensor has been developed, where one is located inside the other. For the experiment, we have used three prototypes with 40 spires for the fed part and 80 spires for the induced part, but with different pipe diameters. P1 has 20mm, P2 25 mm, and P3 32 mm. The sensors were calibrated using salt between 0 g/L and 20 g/L concentrations. We use concentration of 0 g/L, 2.5 g/L, 5 g/L, 10 g/L, 15 g/L and 20 g/L with conductivity of 0.485mS/cm, 5.53 mS/cm, 10.43 mS/cm, 20.4 mS/cm, 31.3 mS/cm, and 41.6 mS/cm. The voltage difference between the minimum and maximum concentrations in each prototype is 1.71 V for P1, 1.41 V for P2, and 0.99 V for P3. Subsequently, the verification of each prototype was performed, measuring concentrations of 7.5 g/L, 12.5 g/L, and 17 g/L, obtaining the lowest relative errors for P1 and P3 with 0.34% and 0.31% respectively.

Pages: 38 to 42

Copyright: Copyright (c) IARIA, 2021

Publication date: May 30, 2021

Published in: conference

ISSN: 2308-3727

ISBN: 978-1-61208-805-1

Location: Valencia, Spain

Dates: from May 30, 2021 to June 3, 2021