Soil Moisture

Notes on using the Adafruit STEMMA soil moisture sensor after unreliable results from cheap capacitive sensors in an ESP32 garden project.

Notes on choosing soil moisture sensors for IoT garden projects, including resistive vs. capacitive sensors, common reliability problems, protection methods, calibration, and a practical recommendation for future builds.

A case study for a proof-of-concept self-watering garden system that uses soil moisture telemetry, an edge gateway, MQTT, REST APIs, and a dashboard to coordinate irrigation decisions.