Gravity: Arduino EC (Electrical Conductivity) Sensor / Meter

The Gravity EC (Electrical Conductivity) Sensor measures the conductivity of aqueous solutions, providing an analogue output for Arduino and compatible microcontrollers. EC measurement is essential for monitoring water quality, nutrient levels in hydroponic systems, and soil salinity in agricultural applications.

The kit includes a conductivity electrode (K=1), a waterproof DS18B20 temperature sensor for temperature compensation, and calibration standard solutions. The Gravity 3-pin interface allows plug-and-play connection without soldering.

Key Features

• Analogue EC Measurement – 1–20 mS/cm range for water quality monitoring
• Gravity Interface – 3-pin PH2.0 connector for plug-and-play Arduino connection
• Temperature Compensation – Included waterproof DS18B20 sensor for accurate readings
• BNC Electrode – Conductivity probe with K=1 constant and ~60 cm cable
• Calibration Solutions Included – 1413 µS/cm and 12.88 mS/cm standards

Specifications

• Operating Voltage – 5.00 V
• Measuring Range – 1–20 mS/cm
• Accuracy – <±10% F.S. (using Arduino 10-bit ADC)
• Operating Temperature – 5–40 °C
• Electrode Constant – K=1 (BNC connector)
• Electrode Cable Length – ~60 cm
• PCB Size – 45 × 32 mm

Package Contents

• 1× Conductivity electrode (BNC connector)
• 1× EC meter circuit board
• 1× Analogue cable
• 1× DS18B20 temperature sensor (waterproof)
• 1× Terminal sensor adapter
• 1× Digital cable
• 1× Conductivity standard solution (1413 µS/cm and 12.88 mS/cm)

Ideal For

• Hydroponic and aquaponic nutrient monitoring
• Aquaculture water quality testing
• Irrigation and soil salinity assessment
• General water quality monitoring

Resources

• DFRobot Wiki – Documentation & Calibration Guide
• Schematic (PDF)
• Electrode User Manual (PDF)
• pH & EC Probe Holder – 3D Printable Model