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LCD
Product Description
An analog Total Dissolved Solids (TDS) sensor meter kit with a dedicated conditioning circuit board, ideal for water quality testing and liquid purity analysis in Arduino and ESP32 projects. This V1.0 module accurately measures the conductivity of mobile ions in a liquid solution, reflecting the total amount of dissolved organic and inorganic substances such as salts, minerals, and heavy metals. It features a waterproof probe with dual platinum-plated or high-conductivity pins that resist polarization and electrochemical corrosion during measurement cycles. Communicating via a simple 0V to 2.3V analog output voltage range, the module includes wide voltage input compatibility and convenient mounting holes, providing an easy-to-use liquid analysis tool for water purifiers, hydroponic farms, and environmental monitoring systems.
Pinout / Layout Connections
The module breaks out its tracking and power interface through two distinct connector groups:
Waterproof Probe Terminal (2-Pin XH2.54 Connector):
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Probe Inputs: Plugs directly into the matching black 2-pin onboard terminal socket (non-polarized).
Control Board Interface (3-Pin Male Header):
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VCC Pin: Power supply input, accepts DC +3.3V to +5.5V.
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GND Pin: Common system ground (0V) reference.
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AOUT Pin: Analog output signal line. Outputs a linear voltage (0V to ~2.3V) proportional to the TDS value of the solution being tested.
Applications
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Hydroponics & Aquaponics: Perfect for tracking vital nutrient solution concentrations and keeping mineral levels within safe growing thresholds.
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Water Purifier Monitoring: Excellent for auditing domestic reverse osmosis (RO) filters, checking real-time filter degradation, and validating drinking water purity.
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Aquarium Water Purity: Ideal for ensuring optimal water hardness and stable ecological conditions for sensitive fish species.
Compatibility
The TDS Sensor Module V1.0 outputs a low-voltage analog signal, making it highly compatible with:
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Arduino Board Series (Uno, Nano, Mega) using standard 5V analog input pins.
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ESP32 and ESP8266 development boards (Fully compatible with 3.3V ADC inputs; output stays within safe thresholds).
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Raspberry Pi and Raspberry Pi Pico (Pairs seamlessly via an external I2C analog-to-digital converter like the ADS1115).
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Standard 3.3V and 5V Microcontrollers.
Technical Specifications
| Parameter | Value / Specification |
| Product Version / Model | TDS Meter Module V1.0 Kit |
| Input Power Voltage | DC 3.3 V to 5.5 V |
| Output Signal Type | Analog Voltage (0 V to ~2.3 V) |
| TDS Measurement Range | 0 ppm to 1000 ppm |
| TDS Measurement Accuracy | $\pm 10\%\ \text{F.S.}$ (at 25 °C calibration) |
| Working Current | 3 mA to 6 mA |
| Probe Interface Connectors | 2-Pin XH2.54 Socket |
| Hardware Probe Cable Length | ~60 cm waterproof lead wire |
What’s in the Box
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1 x TDS Meter Signal Conditioning Board V1.0.
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1 x Waterproof Detachable TDS Sensor Probe with 60cm cable.
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1 x 3-Pin Analog Interface Jumper Wire.
