Soil moisture can be measured using a variety of different techniques: gravimetric, nuclear, electromagnetic, tensiometric, hygrometric, among others. This sensor uses a capacitive method that exploits the dielectric properties of water in soil. Accurate measurement of soil water content is essential for applications in agronomy and botany - where the under- and over-watering of soil can result in ineffective or wasted resources.

Included in the Capacitive Soil Moisture Sensor Package:

• 1x Capacitive Soil Moisture Sensor

• 1x 3-Wire Connector

Features of the Capacitive Soil Moisture Sensor:

• 3.3V - 5.0V Supply Range

• 3.3V Operating Range

• Analog Output 1.5 - 3.3V

• Correlated with Volumetric Water Content 0 % - 100%

• Compatible with Arduino and Raspberry Pi

Full tutorial can be found on blog here.