Lab-grade digital conductivity (EC) module

For Arduino, Raspberry Pi, embedded

The EC module is currently is out of stock🙁.

For laboratory, hydroponics, aquarium, and education

Available with lab-grade K=1.0 probe. Connects directly to your device (Arduino, Raspberry Pi, or embedded) - no other parts required. Our open-source software makes measuring fast and easy. Compatible with probes of other conductivivity constants. (eg K=0.1, K= 10)

Suitable for continuous immersion

This module can be used with any conductivity probe with a BNC connection. The UART interface can communicate with nearly any microcontroller.

Fully tested on Arduino, Raspberry Pi, and STM32

Output pins are labeled on the board, as follows:

• +3V3: 3.3V power input
• TX: UART digital output
• RX: UART digital input
• GND: Ground

Installing software

Arduino: From the Arduino IDE: Sketch → Include Library → Manage Libraries → select Anyleaf

C++: Download Anyleaf.cpp and Anyleaf.h from the C++ Github link below, and place them in your project directory

Python: Run sudo apt install python3-scipy, then pip3 install anyleaf. Ensure Serial is enabled. (Run raspi-config. Select P6 Serial. Do not allow a login shell to be accessible. Enable the serial port hardware).

Example code, and driver source

• Arduino and C++

• Python

• Rust

A minimal Arduino example

#include <Anyleaf.h>

EcSensor ecSensor;

void setup(void) {
    ecSensor = EcSensor(1.0);  // Set K=1.0
}

void loop(void) {
    float ec = ecSensor.read();
    float airTemp = ecSensor.read_temp();

    delay(1000);
}

A miminal Raspberry Pi Python example

import time
from anyleaf import EcSensor, OnBoard

def main():
    delay = 1  # Time between measurements, in seconds
    ec_sensor = EcSensor(K=1.0)

    while True:
        print(f"conductivity: {ec_sensor.read(OnBoard())}")

        time.sleep(delay)


if __name__ == "__main__":
    main()

Datasheet

Can be calibrated using a single point, but this isn't required.

Specifications:

• Module dimensions: 60 × 27 × 17(height) mm
• Weight: 14 grams
• Precision: 3%
• Compatible cell constants: K=0.01, K=0.1, K=1.0, K=10 cm⁻¹
• Conductivity range: 0.01 µS/cm to 1 S/cm
• Digital precision: 12 bit
• Input voltage: 3.3V
• Protocol: UART
• Mounting screws: 4 × M3, 6mm len (included)
• Sensor interface: BNC male (Accepts BNC female sensors)
• Power consumption: 375μA
• UPC / GTIN: 860004179054

Specifications pertaining to the K=1.0 probe only:

• Cell constant: 1.0 cm⁻¹
• Dimensions: 155 × 12 mm
• Weight: 24g
• Measurement range: 100μS/cm to 10mS/cm
• Outer tube material: Plastic
• Cable length: 1 m
• Connector: BNC female
• Temperature range: 0-80°C

Compatible with the Mycodo Environmental Monitoring and Regulation System. If you're using a Raspberry Pi, this is a simple way to get it running with a GUI, charts, and logging. Follow the installation instructions on that page, and add AnyLeaf EC as an input.