Cytron Technologies Maker Soil Moisture Sensor (Capacitive) - Analog Output, Grove Port

The sensor provides an analog voltage output. Connect the signal pin (from the Grove connector) to an ADC input on your microcontroller (e.g., Arduino). The output voltage is inversely proportional to soil moisture: a higher moisture level results in a lower voltage reading. You will need to calibrate the sensor for your specific soil type to map the voltage range to meaningful moisture percentages.

The disable pin (often labeled EN) is the fourth pin on the Grove connector. Pulling this pin LOW (connecting it to GND) turns off the sensor's circuitry, minimizing power consumption and preventing any potential electrolysis at the probe. Drive the pin HIGH (connect to VCC) to activate the sensor for a measurement. This feature is crucial for battery-powered projects to extend operational life.

Yes. The sensor's wide operating voltage range of 2.5V to 7.0V makes it directly compatible with both 3.3V and 5V logic platforms. When using a 3.3V system like a Raspberry Pi, ensure your Grove shield or converter also operates at 3.3V. The analog output voltage will scale with the supply voltage, so your ADC reference should match your system's VCC for accurate readings.

Capacitive sensors, like this Cytron Technologies Maker module, measure the dielectric constant of the soil, which is not reliant on electrical conductivity. This makes them far more resistant to corrosion and electrolysis compared to resistive sensors, which pass a current through the soil and metal probes. Capacitive sensing provides more stable, long-term readings and significantly increases the probe's operational lifespan, especially in continuously moist environments.