The implementation of a low power environmental monitoring and soil moisture measurement system based on UHF RFID

Korošak, Žiga (avtor), Suhadolnik, Nejc (avtor), Pleteršek, Anton (avtor)

A smart sensor label based on the integration of ultra high frequency (UHF) radio frequency identification (RFID) technology and sensors is presented. The label is composed of a semi-active system that measures temperature, light, relative humidity and gravimetric water content (GWC) in the soil. The deployed system provides a simple, cost effective solution to monitor and control the growing of plants in modern agriculture and is intended be a part of a smart wireless sensor network (WSN) for agricultural monitoring. This paper is focused on analysis and development of a moisture sensor to measure GWC. It is based on a capacitance measurement solution, the accuracy of which is enhanced using several sensor driving frequencies. Thanks to the cancellation of supply voltage variations, the modeling of the GWC sensor and readout circuit was correct. The results we measured were close to modeled values. The maximum measurement resolution of the capacitive moisture sensor was 0.07 pF. To get the GWC from measured capacitance, a scale was used to weigh the mass of water in the soil. The comparison between capacitance measurement and calculated soil GWC is presented. The RFID measurement system has energy harvesting capabilities and an ultra-low power microcontroller, which uses embedded software to control the measurement properties. The microcontroller has to choose the appropriate model depending on the measured amplitude and chosen frequency to calculate the actual voltage on the sensing capacitor.

• Jezik: Angleški jezik
• Ključne besede: RFID, moisture sensors, low power microcontroller, data acquisition, precision agriculture, relative humidity, UHF tag, environmental monitoring, sensors
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FE - Fakulteta za elektrotehniko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2019
• Št. strani: 17 str.
• Številčenje: Vol. 19, iss. 24, art. 5527
• PID: 20.500.12556/RUL-133129
• UDK: 681.586
• ISSN pri članku: 1424-8220
• DOI: 10.3390/s19245527
• COBISS.SI-ID: 17277955
• Datum objave v RUL: 12.11.2021

Gradivo je del revije

• Naslov: Sensors
• Skrajšan naslov: Sensors
• Založnik: MDPI
• ISSN: 1424-8220
• COBISS.SI-ID: 10176278

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
• Začetek licenciranja: 14.12.2019

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: RFID, senzorji vlage, mikrokontrolerji z nizko porabo, zajemanje podatkov, natančno kmetijstvo, relativna vlaga, UHF značka, spremljanje okoljskih parametrov