Capacitive Soil Moisture Sensor V2.0

Older resistive soil sensors measure moisture by running a small current directly through two exposed metal pins, which electrolytically corrodes them within weeks of contact with wet soil. This V2.0 probe instead senses moisture capacitively, with the active sensing area coated and sealed so nothing conductive touches the soil directly, letting it stay accurate and intact season after season in an outdoor or greenhouse planter. The analog output scales with how wet the surrounding soil is, which a microcontroller can read directly to drive an automatic watering pump, send a low-moisture alert, or log irrigation data over time. It is the sensor of choice for anyone building a garden or farm automation project that needs to survive repeated watering cycles rather than being treated as a disposable part.