The voltage at the sensor outputs changes accordingly to the
water content in the soil.
When the soil is:
- Wet: the
output voltage decreases
- Dry: the output voltage increases
The output can be a digital signal (D0) LOW or HIGH,
depending on the water content. If the soil humidity exceeds a certain
predefined threshold value, the modules outputs LOW, otherwise it outputs HIGH.
The threshold value for the digital signal can be adjusted using the
potentiometer.
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