Capacitive Soil Moisture Sensor Corrosion-Resistant HW-390 Arduino
The HW-390 Soil Moisture Sensor works by detecting the moisture capacity of the soil and not resistive as in other moisture sensors. This module has a built-in 3.3V voltage regulator. It is made of corrosion-resistant materials which significantly extends its service life.
Working voltage: 3.3 VDC
Output voltage: 0 ~ 3.0 VDC
Dimensions: 98 x 22 mm
Weight: 12 g
0-1023 is the result of a call to analogRead() function that returns output of Arduino built-in Analog to Digital converter. The value is proportional to voltage provided to the analog pin (in reference to selected Reference Voltage VREF).
Please familiarize yourself with Arduino analog ports: