DFRobot Gravity Analog TDS Sensor

The DFRobot Gravity Analog TDS Sensor is designed to measure the Total Dissolved Solids (TDS) level in water for quality monitoring applications. It outputs a stable 0–2.3V analog signal compatible with 3.3V and 5V microcontrollers such as Arduino. The module uses an AC excitation source to reduce probe polarization and improve measurement reliability. Equipped with a waterproof probe and Gravity plug-and-play interface, it ensures easy integration into embedded systems. Ideal for water quality testing, hydroponics, and domestic water monitoring systems.

Features

- Analog TDS measurement module

- Wide input voltage 3.3–5.5V DC

- 0–2.3V analog signal output

- AC excitation to prevent probe polarization

- Waterproof immersion probe

- Gravity interface plug-and-play design

- Compatible with Arduino boards

- Supports 3.3V and 5V controllers

- Stable and repeatable measurements

- Compact control board layout

- Suitable for continuous monitoring systems

Specifications

- Operating Voltage: 3.3–5.5V DC

- Analog Output Voltage: 0–2.3V

- Excitation Mode: AC signal

- Measurement Parameter: Total Dissolved Solids (TDS)

- Probe Type: Waterproof immersion probe

- Output Interface: Analog

- Compatible Controllers: 3.3V / 5V MCU

- Connection Type: Gravity 3-pin interface

- Recommended Temperature Range: 0–60°C

- Calibration: Software calibration supported

- Application Media: Fresh water

Links

- Schematic

- Layout with Dimension

- CD4060BM96 Datasheet

- LMV324A-SR Datasheet

- DFRobot Gravity TDS Sensor Library(Github)

Tutorials

TDS Meter using TDS & Temperature Sensor with Arduino || Measure Water Quality in PPM