Using Arduino sensors to monitor vacuum gauge and soil water moisture

Sensors associated with the Arduino board can be an alternative to traditional sensors. The objective of this study was to calibrate a capacitive sensor to measure soil moisture and determine the soil water retention curve (< 100 kPa) using the MPX5100DP pressure transducer in conjunction with c...

Full description

Bibliographic Details
Main Authors: Thiago Franco Duarte, Tonny José Araújo Silva, Edna Maria Bonfim-Silva, Márcio Koetz
Format: Article
Language:English
Published: Universidad Nacional de Colombia 2021-12-01
Series:Dyna
Subjects:
Online Access:https://revistas.unal.edu.co/index.php/dyna/article/view/94121
Description
Summary:Sensors associated with the Arduino board can be an alternative to traditional sensors. The objective of this study was to calibrate a capacitive sensor to measure soil moisture and determine the soil water retention curve (< 100 kPa) using the MPX5100DP pressure transducer in conjunction with capacitive sensor measurements. The soil used was Red Oxisol, which had a clay texture and a bulk density of 1.20 Mg m−3. The model 𝑦𝑦=𝑎𝑎−𝑏𝑏𝑐𝑐𝑥𝑥 was fitted to the capacitive sensor data, which had the following statistical parameters: 9% (MAPE, mean absolute percentage error), 0.025 (RMSE, root-mean-square error), 0.97 (d), and 0.93 (𝑅𝑅2). In general, the error for the retention curves obtained with the capacitive sensor and that obtained by weighing was 0.025 (RMSE). Despite the slight tendency of the capacitive sensor to underestimate the highest values of soil moisture, these sensors can be used as an alternative for measuring soil moisture and water tension.
ISSN:0012-7353
2346-2183