The Soil Humidity Sensor Module (Hygrometer Sensor) is a simple yet effective device for detecting the moisture level of soil, ideal for Arduino-based automatic watering and smart garden projects.
It works by measuring the electrical resistance between two probes inserted into the soil — the wetter the soil, the lower the resistance. The sensor outputs both analog and digital signals, allowing precise moisture monitoring and easy triggering of relays or pumps in automated irrigation systems.
This module is ideal for DIY projects, greenhouse automation, and environmental monitoring, providing an easy way to maintain healthy plant growth with minimal effort.