The V2.0 Capacitive Soil Moisture Sensor measures water content in soil by detecting changes in the dielectric constant around its probe, not by passing current between two bare metal electrodes. Running on 3.3V to 5.5V at just 5mA, it connects directly to any microcontroller through a PH2.54-3P connector. Unlike resistive sensors, the capacitive soil moisture sensor uses a coated PCB probe so no metal is ever in direct contact with water or soil ions.
The non-obvious point here is that capacitive sensing measures the effective capacitance of the soil-probe system, which changes with water content because water has a dielectric constant of about 80 compared to roughly 4 for dry soil. That large difference makes the output highly sensitive even to small changes in moisture. One honest trade-off with the capacitive moisture sensor is that soil temperature also slightly shifts the dielectric constant, so readings taken at 5°C will differ from readings at 35°C even at identical moisture levels.
Students doing plant biology experiments and building auto-watering rigs, and IoT makers logging field data all reach for this soil moisture sensor. StemVolt provides this sensor with trusted quality, ensuring reliable performance and easy usability.
Related Products:
- Checkout TS-300B Water Turbidity Sensor
Features:
- Operating voltage of 3.3V to 5.5V lets you power it directly from a 3.3V ESP32 or 5V Arduino pin
- PH2.54-3P interface plugs into a standard breadboard jumper wire without any adapter needed
- Soil moisture sensor item type outputs an analog voltage that rises proportionally with water content
Technical specifications:
| Specification | Details |
|---|---|
| Item Type | Soil Moisture Sensor |
| Operating Current | 5mA |
| Operating Voltage | 3.3V to 5.5V |
| Interface | PH2.54-3P |
Applications:
- A smart plant pot uses the V2.0 Capacitive Soil Moisture Sensor to trigger a small peristaltic pump automatically
- A field weather station reads the analog output pin to log daily soil moisture levels over weeks
- A capacitive humidity sensor project in a school lab measures and graphs soil drying rate after watering
Package includes:
- 1 x V2.0 Capacitive Soil Moisture Sensor
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