Grove Capacitive Soil Moisture Sensor Review: Good for Relative Moisture, Not Precision

What it is

Grove Capacitive Moisture Sensor (Corrosion Resistant) — Seeed Studio SKU 101020614

Specifications

Sensing method

Capacitive soil-moisture sensing with corrosion-resistant electrode design Source

Operating voltage

3.3 V / 5 V Source

Output

Analog Source

Dimensions

92.1 x 23.5 x 6.5 mm Source

Measurement scope

Qualitative / relative soil-moisture indication, not quantitative moisture measurement Source

Verified price

USD 6.50 when checked 2026-10-10 Source

Use cases

• Automatic plant watering
• Relative wet/dry threshold detection
• Smart irrigation prototypes
• Soil-moisture trend monitoring after application-specific calibration

Evidence / testing

• Research-based review using current Seeed Studio technical documentation and product information.
• Seeed explicitly states that this sensor provides qualitative rather than quantitative soil-moisture measurement.
• ITHutir has not yet published calibration or outdoor longevity testing for this sensor.

Advantages

• Capacitive approach avoids directly exposed resistive electrodes
• 3.3 V and 5 V operation
• Simple analog output for microcontroller ADC input
• Directly relevant to automatic watering projects

Limitations

• Not a precision volumetric-water-content sensor
• Requires application-specific thresholding or calibration
• Analog readings can be influenced by soil type, placement and supply/reference conditions
• No ITHutir hands-on calibration evidence yet

Alternatives

No verified alternatives are linked.

Who it may suit

• DIY irrigation builders
• Makers who need a simple relative wet/dry sensor
• Projects where low cost matters more than laboratory-grade measurement

Current purchasing options