Newly calibrated analytical models for soil moisture content and pH value by low-cost YL-69 hygrometer sensor

Tan, Weng Yeow; Then, Yi Lung; Lew, Yao Long; Tay, Fei Siang

doi:10.1016/j.measurement.2018.10.071

Cited by 21 publications

(4 citation statements)

References 16 publications

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“…It works by passing a current across the two electrodes through the substrate and returns the measurement of resistance for substrate moisture content determination. The value of resistance was measured by the changes in voltage between horizontal electrode distances within the electrical field created by the current via the electrodes [36]. Electrical resistance is a function of the amount of soil moisture (water).…”

Section: Moisturementioning

confidence: 99%

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Vermicomposting Smart Closed Reactor Design and Performance Assessment by Using Sewage Sludge

Ghorbani

Sabour

Bidabadi

2021

Waste Biomass Valor

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This study aims to design a smart closed reactor of vermicomposting to convert sewage sludge and any organic waste to high-quality vermicompost. In this reactor design, all aspects of growth and reproduction of Eisenia Fetida worms, such as aeration, temperature, light, and moisture, were considered. We analyzed the physicochemical, bacterial, and microstructural of produced vermicompost and growth rate of worms in a substrate of 70% sewage sludge, 20% cow manure, and 10% sugarcane bagasse in a container and the smart reactor. The results show that vermicomposting in the smart reactor took 50% less time and 30% more worm growth rate to produce the same quality as in a container. After vermicomposting in the reactor, the parameters of pH, fecal coliform, phosphorus, organic matter, and C/N decreased whereas the parameters of carbon, nitrogen, nitrate, ammonia nitrate, and EC increased, slightly. Although, the EC amount of the reactor production is more than the container one, the amount of moisture, phosphorus, and organic matter of the vermicompost in the container is more than the reactor one.Based on the odor absorption and leachate elimination of this reactor, we recommend that it be utilized for vermicompost production, including out of smelly organic wastes such as sewage sludge, even in any public zone and personal houses.

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Section: Moisturementioning

confidence: 99%

“…To characterize the dynamics of vermicompost moisture provided by a fog-diffuser system, we used a resistivity sensor. This hygrometer sensor was powered by a small PCB (Printed Circuit Board) with both digital and analog outputs [36].…”

Section: Introductionmentioning

confidence: 99%

Vermicomposting Smart Closed Reactor Design and Performance Assessment by Using Sewage Sludge

Ghorbani

Sabour

Bidabadi

2021

Waste Biomass Valor

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“…This is explained by the fact that the soil has a larger contact surface than other treatments, in addition to the moisture of a sample directly influencing the resistivity of the sensor. According to Tan et al (2019) the electrical resistivity of the soil decreases exponentially as water saturation increases. In general, similarities can be observed among the results obtained by treatments T1 and T4 (Figures 2A and 2D, respectively), due to the intrinsic characteristics of the substrate.…”

Section: First Experiment: Study Of the Relationship Between Electric Tension And Moisturementioning

confidence: 99%

“…This statement corroborates the analysis of the results, as, in this work, the sensors were installed and removed successively at the end of each reading, becoming a possible source of errors. Furthermore, Tan et al (2019), working with the Hl-69 sensor, also elucidate that the reaction between soil moisture and O2 reduces the lifetime of the sensor due to rod oxidation.…”

Section: First Experiment: Study Of the Relationship Between Electric Tension And Moisturementioning

confidence: 99%

Response to the HL - 69 soil resistive moisture sensor in different substrates

Silva

Bessa

Sousa

et al. 2022

RBAI

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The objective of this work was to evaluate the response of the soil moisture resistive sensor HL-69 to different substrates. The study was split into two experiments. These were conducted at the Hydraulics and Irrigation Laboratory of the Agricultural Engineering Department of the Federal University of Ceará. Forty polyethylene vases with a capacity of 1030 mL were used, arranged on a benchwork. The treatments corresponding to the substrates were T1 (soil + commercial substrate (1: 1)); T2 (soil + hydroretainer (2 g kg-1); T3 (soil) and T4 (commercial substrate), with ten replicates per treatment. The readings of the Hl-69 sensors were carried out simultaneously with the weighing of the vases on an analytical scale. According to the most promising response, the second experiment was started with the adoption of the T3 treatment. The readings carried out in this work followed two different methodologies: Firstly, readings of the saturation condition until low moisture (wet-dry) were obtained, and later they were obtained from the low moisture point to saturation (dry-wet). The Hl-69 sensor shows poor performance in determining the water content in the adopted substrates, showing better performance for the T3 treatment. The methodology that obtained the best adjustment of the data was the soil readings in the wetting process (dry-wet).

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A Method to Implement a Monitoring System Based on Low-Cost Sensors for Micro-environmental Conditions Monitoring in Greenhouses

Romano¹,

Brambilla²,

Toscano³

et al. 2020

Lecture Notes in Civil Engineering

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Newly calibrated analytical models for soil moisture content and pH value by low-cost YL-69 hygrometer sensor

Cited by 21 publications

References 16 publications

Vermicomposting Smart Closed Reactor Design and Performance Assessment by Using Sewage Sludge

Vermicomposting Smart Closed Reactor Design and Performance Assessment by Using Sewage Sludge

Response to the HL - 69 soil resistive moisture sensor in different substrates

A Method to Implement a Monitoring System Based on Low-Cost Sensors for Micro-environmental Conditions Monitoring in Greenhouses

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