Gravity EC Meter Example Code for Arduino

This industrial electrical conductivity probe integrates PT1000 RTD that can be used to measure and calibrate liquid temperature easily. The following program adds temperature calibration to the basic measurement.
If you have another type of temperature sensor, or plan to use other temperature data sources, you can also get the temperature directly and fill it into `getEC_us_cm(EC_Voltage, Temp)` in Celsius (°C).

Hardware Preparation

DFRduino UNO R3 x 1
Electrical Conductivity Probe x 1
Electrical Conductivity Signal Conversion Board x 1
PT1000 RTD Signal Conversion Board x 1
Electrical Conductivity Calibration Solution 1413us/cm x 1
Jumper wires
Tested Solution

Software Preparation

Arduino IDE (version 1.8.x or later)
Download and install the DFRobot_ECPRO Arduino Library. (About how to install the library?)

Probe - Signal Conversion Board

Probe Wire	Signal Conversion Board
S+ (EC)	Electrical Conductivity Board S+
S- (EC)	Electrical Conductivity Board S-
TEMP	PT1000 Board T+
TEMP	PT1000 Board T-

Signal Conversion Board - Arduino

Signal Conversion Board	Arduino UNO
Electrical Conductivity Board	A1
PT1000 Board	A2

Other Preparation Work

Connect all the parts.

Sample Code

#include "DFRobot_ECPRO.h"

#define EC_PIN A1
#define TE_PIN A2

DFRobot_ECPRO ec;
DFRobot_ECPRO_PT1000 ecpt;

uint16_t EC_Voltage, TE_Voltage;
float Conductivity, Temp;

void setup()
{
  Serial.begin(115200);

  ec.setCalibration(1); //Replace the 1 with the calibrated K value if it's calibrated
  Serial.println("Default Calibration K=" + String(ec.getCalibration()));
}

void loop()
{
  EC_Voltage = (uint32_t)analogRead(EC_PIN) * 5000 / 1024;
  TE_Voltage = (uint32_t)analogRead(TE_PIN) * 5000 / 1024;

  Temp = ecpt.convVoltagetoTemperature_C((float)TE_Voltage/1000);
  Conductivity = ec.getEC_us_cm(EC_Voltage, Temp);

  Serial.print("EC_Voltage: " + String(EC_Voltage) + " mV\t");
  Serial.print("Conductivity: " + String(Conductivity) + " us/cm\t");
  Serial.print("TE_Voltage: " + String(TE_Voltage) + " mV\t");
  Serial.println("Temp: " + String(Temp) + " ℃");

  delay(1000);
}

Result

Default Calibration K=1.00
EC_Voltage: 1538 mV	Conductivity: 976.46 us/cm	TE_Voltage: 783 mV	Temp: 23.02 ℃
EC_Voltage: 1538 mV	Conductivity: 976.46 us/cm	TE_Voltage: 783 mV	Temp: 23.02 ℃
EC_Voltage: 1538 mV	Conductivity: 976.46 us/cm	TE_Voltage: 783 mV	Temp: 23.02 ℃
EC_Voltage: 1538 mV	Conductivity: 976.46 us/cm	TE_Voltage: 783 mV	Temp: 23.02 ℃
EC_Voltage: 1533 mV	Conductivity: 973.29 us/cm	TE_Voltage: 783 mV	Temp: 23.02 ℃
EC_Voltage: 1533 mV	Conductivity: 973.29 us/cm	TE_Voltage: 783 mV	Temp: 23.02 ℃
EC_Voltage: 1533 mV	Conductivity: 973.29 us/cm	TE_Voltage: 783 mV	Temp: 23.02 ℃
EC_Voltage: 1533 mV	Conductivity: 973.29 us/cm	TE_Voltage: 783 mV	Temp: 23.02 ℃
EC_Voltage: 1533 mV	Conductivity: 973.29 us/cm	TE_Voltage: 783 mV	Temp: 23.02 ℃

Example Code for Arduino-Temperature Calibration