XXV SBRH - Simpósio Brasileiro de Recursos Hídricos

Data: 19/11/2023 à 24/11/2023
Local: Centro de Convenções AM Malls - Sergipe
ISSN: 2318-0358
Mais informações: http://www.abrhidro.org.br/xxvsbrh

A summary of "Trade-off between cost and accuracy in automated low-cost soil moisture sensors"




Dimaghi Schwamback, Magnus Persson, Ronny Berndtsson, Luis Eduardo Bertotto, Alex Naoki Asato Kobayashi, Edson Cezar Wendland




Automated soil moisture systems are commonly used in precision agriculture. Using low-cost sensors, the spatial extension can be maximized, but the accuracy might be reduced. In this paper we address the trade-off between cost and accuracy comparing low-cost and commercial soil moisture sensors. The analysis is based on the capacitive sensor SKU:SEN0193 tested under lab and field conditions. In addition to individual calibration, two simplified calibration techniques are proposed: universal calibration, based on all 63 sensors, and a single point calibration using the sensors response in dry soil. During the second stage of testing, the sensors were coupled to a low-cost monitoring station and installed in the field. The sensors were capable of measuring daily and seasonal oscillations in soil moisture resulting from solar radiation and precipitation. The low-cost sensor performance was compared to commercial sensors based on five variables: (1) cost, (2) accuracy, (3) qualified labor demand, (4) sample volume, and (5) life expectancy. Commercial sensors provide single-point information with high reliability but at a high acquisition cost, while low-cost sensors can be acquired in larger numbers at a lower cost, allowing for more detailed spatial and temporal observations, but with medium accuracy. This paper is available at https://doi.org/10.3390/s23052451 and is aligned with the topics i (monitoring under different scales), ii (uncertainties sources) and iii (comparing technologies) suggested by the coordinators from special session STE19.

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