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Sensors 2016, 16(8), 1292; doi:10.3390/s16081292

Low-Cost Soil Moisture Profile Probe Using Thin-Film Capacitors and a Capacitive Touch Sensor

1
Faculty of Engineering, Gifu University, Gifu 501-1193, Japan
2
Graduate School of Information Science and Technology, The University of Tokyo, Tokyo 113-8656, Japan
3
Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Simon X. Yang
Received: 30 May 2016 / Revised: 2 August 2016 / Accepted: 9 August 2016 / Published: 15 August 2016
(This article belongs to the Special Issue Sensors for Agriculture)
View Full-Text   |   Download PDF [4581 KB, uploaded 15 August 2016]   |  

Abstract

Soil moisture is an important property for agriculture, but currently commercialized soil moisture sensors are too expensive for many farmers. The objective of this study is to develop a low-cost soil moisture sensor using capacitors on a film substrate and a capacitive touch integrated circuit. The performance of the sensor was evaluated in two field experiments: a grape field and a mizuna greenhouse field. The developed sensor captured dynamic changes in soil moisture at 10, 20, and 30 cm depth, with a period of 10–14 days required after sensor installation for the contact between capacitors and soil to settle down. The measured soil moisture showed the influence of individual sensor differences, and the influence masked minor differences of less than 0.05 m3·m−3 in the soil moisture at different locations. However, the developed sensor could detect large differences of more than 0.05 m3·m−3, as well as the different magnitude of changes, in soil moisture. The price of the developed sensor was reduced to 300 U.S. dollars and can be reduced even more by further improvements suggested in this study and by mass production. Therefore, the developed sensor will be made more affordable to farmers as it requires low financial investment, and it can be utilized for decision-making in irrigation. View Full-Text
Keywords: soil moisture; soil moisture profile probe; printing circuit; capacitive touch sensor soil moisture; soil moisture profile probe; printing circuit; capacitive touch sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kojima, Y.; Shigeta, R.; Miyamoto, N.; Shirahama, Y.; Nishioka, K.; Mizoguchi, M.; Kawahara, Y. Low-Cost Soil Moisture Profile Probe Using Thin-Film Capacitors and a Capacitive Touch Sensor. Sensors 2016, 16, 1292.

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