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...
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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 caused by a nearby object or material, such as a finger, water, or moisture in soil. It is used for touch buttons, proximity detection, and liquid or moisture-level sensing, and it matters because it can work without exposed metal contacts, avoiding the corrosion that bare probes suffer in damp conditions.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- ESP32
- ESP32 is a family of low-cost microcontroller chips and modules from Espressif with built-in WiFi and Bluetooth. They support programmable firmware and over-the-air updates, and are commonly programmed with toolchains such as the Arduino core and ESP-IDF.
- 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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Sensors & Input
Supplier page — dfrobot.com
Supplier Description · 2.1 MB · Click any page to view full size
SEN0308 gravity waterproof capacitive soi moisture sensor schematics V1.0
Schematic · 123.7 KB · Click any page to view full size
Related Tutorials
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