M5 Stack Earth Moisture Sensor Unit with Analog and Digital Output - Grove Interface

The sensor is designed to operate at a nominal 5V DC. It is not recommended to exceed this voltage, as it powers both the sensing circuitry and the signal conditioning components. Always connect it to a stable 5V supply, typically provided by an M5 Core, Arduino Uno, or a regulated bench power source.

Connection is straightforward using the included Grove cable. Connect the sensor's Grove connector to a Grove base shield attached to your Arduino. For analog reading, use an analog input pin (e.g., A0). For digital reading, use a digital input pin. The sensor's output type (analog voltage level or digital high/low) is determined by the onboard potentiometer setting and your code logic.

The onboard 10K potentiometer adjusts the sensitivity threshold for the digital output signal. Turn the potentiometer to set the moisture level at which the digital pin switches from low to high. For calibration, place the sensor probes in soil at your desired 'dry' or 'wet' threshold and adjust the pot until the digital output changes state. The analog output remains a continuous representation of the soil's resistivity.