Soil moisture sensors measure the volumetric water content in soil. Since the direct gravimetric measurement of free soil moisture requires removing, drying, and weighing of a sample, soil moisture sensors measure the volumetric water content indirectly by using some other property of the soil, such as electrical resistance, dielectric constant, or interaction with neutrons, as a proxy for the moisture content.
- VCC external 3.3V-5V
- GND GND External
- DO small board digital output interfaces ( 0 and 1 )
- AO small board analog output interface
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