With this module, you can tell when your plants need watering by how moist the soil is in your pot, garden, or yard. The two probes on the sensor act as variable resistors. Water is conductive, so the more water in the soil, the better the conductivity and the lower the resistance with a higher SIG out.
The working voltage of 3.3 V to 5 V.
A fixed bolt hole, convenient installation.
The power indicator light (red) and digital switch output indicator light (green).
The sensitivity is adjustable using digital potentiometer (blue).
The comparator uses the LM393 chips, work stability.