Development of data monitoring application based on IoT
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Development of data monitoring application based on IoT Xu Chen1 • Xiaoping Cai1 • Yangyang Zhou1 • Zhibin Hao1 Received: 10 February 2020 / Revised: 20 March 2020 / Accepted: 10 April 2020 Ó Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract There is a sustained and changing voltage between living trees and soil, which may be related to transpiration. If the data of bioelectricity, transpiration characteristics and environmental factors can be observed continuously, thereby finding the relationship between the voltage and transpiration, a new method for transpiration measurement can be provided. In order to carry out long-term observations and obtain relevant data, and to explore the relationship between the voltage and transpiration further, a data monitoring application based on IoT was developed by using the Flutter mobile framework. The application can access the database, obtain data, and display real-time data and data charts, which provides a technical basis for the study of the relationship between the voltage and transpiration. Keywords Bioelectricity Transpiration Data monitoring Mobile application IoT
1 Introduction There are three kinds of electrical signals in plants: action potentials (APs), variation potentials (VPs), and system potentials (SPs) [1]. The generation and transmission of the electrical signals are the key functions of plants to adapt to the environment [2]. Electrical signals can be induced by a variety of biotic (insect [3] and pathogen [4, 5]) and abiotic (cutting [6], flame [7], heating [8], cold [9] and salt tolerance [10]). At present, many researches on bioelectricity of plants are focused on phloem, which is considered as the transmission pathway of electrical signals [11, 12], while xylem is largely ignored. Consequently, the mechanism behind the voltage in the xylem is still unclear. There is a voltage between the xylem of the living tree and the soil. Through the observation of the voltage of spruce xylem, it is found that there is a nonlinear relationship between the daily change of the electric potential difference and the solar radiation [13]. Through observations of Turkish oak, it is found that in summer, the maximum value of electric potential difference appears in the morning and the minimum value appears in the
& Zhibin Hao [email protected] 1
College of Computer and Information Engineering, Tianjin Agricultural University, Tianjin 300384, China
afternoon; there are at least two maximum values in each year: leaf stage and summer; the electric potential difference is also related to air water potential and sap flow [14, 15]. The observation on a poplar indicates that although the voltage change is significantly related to sap flow, it is not simply proportional, which suggests there are other factors that also affect the voltage change [16]. According to the observation of various tree species, pH, air humidity, soil temperature, electrode material, and electrode size are also closely r
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