Gravity: Analog TDS Sensor / Meter for Arduino.

The Gravity: Analog TDS Sensor / Meter Kit for Arduino is a highly effective, plug-and-play solution designed to evaluate the Total Dissolved Solids (TDS) levels in liquids. This hardware setup lets makers, students, and engineers quickly measure water cleanliness and track real-time purity values across a wide variety of smart environmental projects.

🌟 Key Product Features

Wide Voltage Range: Fully supports input power ranging from 3.3V to 5.5V DC, making the module natively compatible with standard 5V controllers (like Arduino Uno/Mega) as well as modern 3.3V control architectures (such as ESP32, Raspberry Pi Pico, and STM32).
Anti-Polarization Probe Design: The signal conditioning transmitter board utilizes an AC excitation source for data acquisition. By toggling alternative current signals across the pins, the system actively minimizes electrical polarization at the probe tips. This drastically enhances output stability and protects the physical needles from long-term corrosion or calcification.
Submersible Waterproof Probe: The package includes a heavy-duty, two-needle waterproof probe capable of remaining fully submerged for reliable long-term water metrics.
Seamless Interface: Features an onboard Gravity standard layout (PH2.0-3P interface) alongside an intuitive color-coded cable assembly, ensuring clean, solder-free wiring setups.

Gravity: Analog TDS Sensor / Meter for Arduino.

🛠️ Common Applications

Domestic Drinking Water Monitoring: Ideal for benchmarking pure tap water against industrial filtration systems like Reverse Osmosis (RO).
Hydroponics & Indoor Farming: Used by growers to audit nutrient chemical density dissolved in water tanks.
Aquariums & Aquaculture Ecosystems: Keeps delicate aquatic habitats within precise mineral concentration limits.
Environmental Field Testing: Deployed on remote IoT field devices to sample river water or open lakes.

📊 Technical Detailed Specifications

Technical Parameters	Rated Values
Input (Supply) Voltage Range	3.3V ~ 5.5V DC
Output Signal Voltage	0V ~ 2.3V Analog
Operational Working Current	3mA ~ 6mA
TDS Active Measurement Range	0 ~ 1000 ppm
Measurement Resolution/Accuracy	±10% Full Scale (at 25°C)
Signal Board Physical Size	42mm × 32mm
Cable Length (TDS Probe)	Approximately 83 cm
Hardware Interfaces Included	PH2.0-3P (Gravity Module) / XH2.54-2P (Electrode)

Gravity: Analog TDS Sensor / Meter for Arduino.

⚠️ Implementation Considerations & Cautions

Waterproof Limitations: Only the probe head and cable are waterproof; the connector and signal transmitter board are not waterproof and must be protected from spills and moisture [DFRobot Technical Documentation].
Temperature Limits: The probe is not rated for use in liquids exceeding 55°C, as high thermal conditions can degrade materials and skew calculations [DFRobot Technical Documentation].
Container Placement: Avoid placing the probe directly against the edges of your testing container, as container boundaries can distort electrical paths and affect reading accuracy [DFRobot Technical Documentation].