Soil Moisture Sensor Module

A module for detecting moisture levels in soil. Ideal for experimenting with automatic watering systems and alarms.
Consisting of a resistive moisture probe, which can be pressed into the soil, and an electronic module producing both analogue and digital outputs.
A sensitivity control allows setting of a trigger point for the moisture level at which the digital output switches from 1 (dry) to 0 (wet) via the onboard LM393 comparator. The analogue output provides a voltage level that varies with the level of moisture detected.
Nominally rated at 5Vdc.