Chakraborty, M. , Malkani, A. and Biswas, K. (2019) Hand-held soil moisture meter using polymer coated sensor. IEEE Instrumentation and Measurement Magazine, 22(5), pp. 24-29. (doi: 10.1109/IMM.2019.8868273)
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Abstract
An appropriate proportion of water content in the soil is critical for plant growth [1]. The use of capacitive soil moisture sensor exploits the very property of soil that the dielectric value of soil varies with the amount of water content [2], [3]. Use of a capacitive sensor for soil moisture measurement provides some advantages such as better accuracy after soil-specific calibration, high sensitivity, flexibility in probe design, easy installation and cost-effectiveness. A copper cladded epoxy material, coated with a thin film of polymethyl methacrylate (PMMA) polymer, is an established procedure to fabricate the sensor [3], [4], which has been used here for soil moisture sensing. This paper describes the development of a rechargeable battery-operated hand-held meter for fieldwork by using this PMMA coated sensor along with a suitable signal conditioning circuit. The thermo-gravimetric method has been utilized to obtain the actual moisture content of soil [5] and calibrate it with respect to the voltage output of the meter. Moreover, with the moisture content, surrounding temperature and humidity are also useful atmospheric parameters used by weather stations [6]. For this, a DHT12 sensor has been integrated with this hand-held meter. IoT extension of measured data is implemented by a SIM900A GPRS/GSM modem to make the meter smart.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Chakraborty, Dr Moupali |
| Authors: | Chakraborty, M., Malkani, A., and Biswas, K. |
| College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
| Journal Name: | IEEE Instrumentation and Measurement Magazine |
| Publisher: | IEEE |
| ISSN: | 1094-6969 |
| ISSN (Online): | 1941-0123 |
| ISBN: | 19410123 10946969 |
| Published Online: | 17 October 2019 |
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