Elecrow Crowtail Moisture Sensor 2.0 - Analog Soil Moisture Sensor Module

The module is rated for 3.3V DC operation. While it can often be powered from a 5V system, the analog output signal will correspond to the supply voltage. For use with 5V logic microcontrollers, ensure the analog input can handle the signal level or use a voltage divider to avoid damaging the ADC pin.

Connect the sensor's Crowtail cable to a compatible base shield or use the individual pins: VCC to 3.3V, GND to GND, and the analog signal pin (A) to an analog input pin on the Arduino (e.g., A0). In your code, use the analogRead() function on the designated pin. The reading will decrease as soil moisture increases due to the drop in resistance.

All exposed metal probes in soil will eventually experience oxidation and galvanic corrosion, which can affect long-term accuracy. For permanent installations, consider periodic cleaning or applying a protective coating. For most hobbyist and short-to-medium term projects, the electroplated probes provide sufficient durability.

Yes, but note that the Raspberry Pi lacks built-in analog inputs. You will need an external ADC (Analog-to-Digital Converter) module to interface with this sensor's analog output. The ESP32 has built-in ADC pins and is directly compatible, making it an excellent choice for IoT-based soil monitoring projects.