Reference
This article provides an in-depth look at soil moisture sensors, explaining how they function using resistance to determine moisture levels, and offering guidance on their application in different soil types.
Principle
The soil moisture sensor probe with two exposed conductors acts as a variable resistor whose resistance varies with the soil's moisture content. The more water in the soil, the better the conductivity and the lower the resistance. The sensor produces an output voltage according to the resistance, by which we can determine the soil moisture level.
Other Supplementary Information
Make sure the sensor probes are inserted into the soil at certain depths.
We can also connect the soil moisture sensor with other output modules to make automatic projects.
Soil Moisture Reference
Note:
- The soil water content may vary from different soil medias. Since the water in soil is unevenly distributed, the measured data only represents the local humidity.
- The top plastic portion of the sensor is not waterproof, so please do not insert the whole sensor into the soil.
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