Grove - Capacitive Moisture Sensor (Corrosion Resistant) | Seeed Studio Wiki

[giscus[bot]]

Grove - Capacitive Moisture Sensor (Corrosion Resistant) | Seeed Studio Wiki

Grove - Capacitive Moisture Sensor (Corrosion Resistant)

https://wiki.seeedstudio.com/Grove-Capacitive_Moisture_Sensor-Corrosion-Resistant/

[MihaMarkic]

Would you guys mind exporting STEP 3D model (or STL if possible) from Altium designer, which is the only choice at the moment (if I'm not mistaken)?

[xzxcessarr]

Hi, thanks for feedback! We provide the Eagle files here: https://files.seeedstudio.com/wiki/Grove-Capacitive_Moisture_Sensor_Corrosion_Resistant/res/Grove-Capacitive%20Moisture%20Sensor%20(Corrosion%20Resistant).zip, you can download it and convert it into AD Files add your 3D electronic component to build your stl model. If well you can use this online EDA tool: https://lceda.cn/editor to convert and build stl model by select the encapsulation you need, it is very easy to use.

[Yonik94]

Hi, I'm using this sensor with libre le potato computer board (compatible with raspberry pi model 3 B+), with A/D converter MCP3002 (10bit) to get the analog values from the sensor.
It looks strange for me. I'm getting about 100.97-101 voltage when it totally dry and 100.4 when it totally wet (in a water).
Is it make sense? it looks me too small difference.. please help me to understand my mistake if I have it..

Here is my python code only for the test:

import time
import spidev

spi_ch = 0

# Enable SPI
spi = spidev.SpiDev(0, spi_ch)
spi.max_speed_hz = 1200000

def read_adc(adc_ch, vref = 3.3):

    # Make sure ADC channel is 0 or 1
    if adc_ch != 0:
        adc_ch = 1

    # Construct SPI message
    # # First bit (Start): Logic high (1)
    # Second bit (SGL/DIFF): 1 to select single mode
    # Third bit (ODD/SIGN): Select channel (0 or 1)
    # Fourth bit (MSFB): 0 for LSB first
    #  Next 12 bits: 0 (don't care)
    msg = 0b11
    msg = ((msg << 1) + adc_ch) << 5
    msg = [msg, 0b00000000]
    reply = spi.xfer2(msg)

    # Construct single integer out of the reply (2 bytes)
    adc = 0
    for n in reply:
        adc = (adc << 8) + n

    # Last bit (0) is not part of ADC value, shift to remove it
    adc = adc >> 1

    # Calculate voltage form ADC value
    voltage = (vref * adc) / 1024

    return voltage

# Report the channel 0 and channel 1 voltages to the terminal
try:
    while True:
        adc_0 = read_adc(0)
        adc_1 = read_adc(1)
        print(
            "Ch 0:", round(adc_0, 2),
            "V Ch 1:", round(adc_1, 2),
            "V")
        time.sleep(1)

finally:
    spi.close()