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  • Article · December 23 doi: 10. 30871/jaic v7 6809 citations read authors




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    01#Повторная калибровка модельного емкостного датчика для измерения влажности почвы IoT

    III.
     
    R
    ESULT AND 
    D
    ISCUSSION
     
    A. IoT-Based Soil Moisture Sensor 
    The Internet of Things (IoT) makes it easy for users to 
    measure soil moisture using various electronic devices. The 
    IoT soil moisture sensor uses Arduino Uno as a controller and 
    the ESP-01 Wifi module as a wireless transceiver. The IoT 
    Based Soil Moisture Sensor circuit is as follows: 
    Figure 1. IoT-Based Soil Moisture Sensor 
    Figure 1 shows that the appearance of the IoT-based soil 
    moisture sensor circuit. IoT-based soil moisture sensor using 
    capacitive sensor with 5.5v power supply. The output value 
    of IoT-based soil moisture before calibration is in the form of 
    voltage (v). This circuit gets a voltage of 615 (v) in air 
    conditions and 240 (v) when in water. The changes in voltage 
    values indicates that IoT-based soil moisture sensor able to 
    describe soil moisture under various condition. 
    B. Gravimetric Test  
    Soil moisture can be determined by carrying out a 
    gravimetric test. The experiment was carried out on 1000 ml 
    of soil. Next, 100 ml of soil sample was taken and then dried 
    using 100 ml of 95% alcohol. The burning process was carried 
    out twice with 50 ml of 95% alcohol each time. The drying 
    process lasts for 5 minutes 10 seconds and 4 minutes 30 
    seconds. After that, the sample soil was cooled and then its 
    weight was measured. The measurement results are as 
    follows: 
    T
    ABLE 
    2.
    G
    RAVIMETRIC 
    W
    ATER 
    C
    ONTENT 
    Item 
    Values 
    Units 
    Wet Soil + Tin 
    86 

    Dry Soil + Tin 
    78 

    Tin Weight 
    17 

    Gravimetric Water Content 
    0,131147541 
    g g
    -1
    Gravimetric water content as shown in Table 2 was only 
    carried out once on a 100 ml soil sample. This value is then 
    used as a correction factor for dry soil measurements under 


    JAIC 
    e-ISSN: 2548-6861 
    Re-Calibration of Model-Based Capacitive Sensor for IoT Soil Moisture Measurements 
    (Iman Setiawan, Mohammad Dahlan Th. Musa, Saskia Amalia Putri) 
    153 
    air dry conditions for 1000 ml of soil. The dry soil 
    measurement is then used as 
    𝑚
    𝑑𝑟𝑦

    The next step is that measurements are carried out at five 
    levels of increase in water volume, namely air dry, 100 ml, 
    200 ml, 300 ml and 400 ml. For each increase in water 
    volume, measurements are also carried out using an IoT-
    based soil moisture sensor. The results of the gravimetric test 
    experiment are as follows. 
    T
    ABLE 
    3.
    G
    RAVIMETRIC 
    T
    EST 
    Table 3 shows that the greater the soil + container weights, 
    the smaller the sensor measurement. The same pattern was 
    also obtained for volumetric soil moisture content (
    𝜃
    𝑣
    ). The 
    𝜃
    𝑣
    value is obtained using 
    𝜌
    𝑠𝑜𝑖𝑙
    =
    0.57. To obtain predictions 
    of soil moisture, the 
    𝜃
    𝑣
    and sensor measurement values are 
    then modelled into the linear and polynomial regression 
    models.
    C. Model  
    Volumetric soil moisture content and raw sensor data were 
    analyzed using linear regression and polynomial regression 
    models. The volumetric soil moisture content becomes the 
    response variable (y) and raw soil moisture sensor data 
    becomes the predictor variable (x). Adjusted R Squared is 
    then carried out for each model as follows: 
    T
    ABLE 
    4
    M
    ODEL 
    S
    ELECTION

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    Article · December 23 doi: 10. 30871/jaic v7 6809 citations read authors

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