DFRobot
Gravity: Analog Waterproof Capacitive Soil Moisture Sensor
The Gravity Analogue Waterproof Capacitive Soil Moisture Sensor from DFRobot measures soil moisture using capacitive sensing rather than resistive probes, of...
The Gravity Analogue Waterproof Capacitive Soil Moisture Sensor from DFRobot measures soil moisture using capacitive sensing rather than resistive probes, offering significantly better corrosion resistance and longer lifespan. The sensor is fully waterproof and can operate even when completely submerged.
A built-in voltage regulator supports a wide 3.3–5.5 V input range, making it compatible with Arduino, micro:bit, ESP32, STM32, and other 3.3 V or 5 V development boards. For single-board computers like the Raspberry Pi, an external ADC is required to read the analogue output.
Key Features
- Waterproof Design – Fully sealed construction with laminate coating for long-term use in soil or water
- Capacitive Sensing – No exposed metal electrodes, greatly reducing corrosion compared to resistive sensors
- Wide Voltage Input – 3.3–5.5 V DC with onboard regulator, compatible with most microcontrollers
- Analogue Output – 0–3 V DC output proportional to soil moisture level
- Gravity Interface – Standard 3-pin 2.54 mm connector for easy wiring
- Extended Probe – 175 mm sensing length with 1.5 m cable
Specifications
- Supply Voltage – 3.3–5.5 V DC
- Output Voltage – 0–3 V DC
- Interface – 3-pin 2.54 mm (Gravity compatible)
- Cable Length – 1.5 m
- Probe Dimensions – 175 × 30 mm
Ideal For
- Garden and greenhouse monitoring systems
- Automated plant watering projects
- Agricultural and environmental data logging
- IoT soil condition monitoring
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- ADC
- An analogue-to-digital converter reads a changing voltage and turns it into a number the microcontroller can use. It matters when connecting analogue sensors such as light, sound, or variable-resistor sensors.
- capacitive sensing
- Capacitive sensing detects changes in electrical capacitance, in this case caused by different amounts of water in the soil near the sensor plate. It matters because it avoids exposed metal probe contacts, which can corrode in damp soil over time.
- ESP32
- ESP32 is a family of microcontroller modules with built-in wireless features such as Bluetooth and WiFi. Knowing this product uses an ESP32-based module helps explain how it provides wireless serial communication and firmware update features.
- Gravity
- Gravity is DFRobot’s plug-in connector system for sensors, motors and modules, using standard cables to reduce loose jumper wiring. It matters because Gravity-compatible parts can connect directly to these ports, while non-Gravity parts may need adapters or manual wiring.
- IoT
- Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
- STM32
- STM32 is a family of microcontroller chips commonly used in embedded electronics. Knowing a product uses an STM32 can help when looking at firmware updates, pin connections, or low-level serial control options.
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Brands
Sensors & Input
Supplier page — dfrobot.com
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Related Tutorials
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