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Sensors / Smart Water Ions:

» SWI 06: Socket4 Sensor Reading

Turn on the Smart Water Ions Sensor Board and reads the Ions sensor connected in the SOCKET4 printing the result through the USB. In this case we are going to measure Chloride Ion, but all Ions can be connected in the four available sockets.

Required Materials

1 x Waspmote
1 x Battery
1 x Smart Water Ions Sensor Board
1 x Chloride Sensor Probe
1 x Single Junction Reference Probe
1 x Chloride Calibration Kit (for those sensors which require calibration)

Notes

- The Chloride Sensor Probe must be used with the Double Junction Reference Probe
- The Chloride Sensor, can be connected in any of the four available sockets
- The calibration process of the ions sensors is described in the technical guide
- It advisable to measure the temperature of the calibration solution

Code

/*  
 *  ------ [SWI_06] - SOCKET4 reading for Smart Water Ions-------- 
 *  
 *  Explanation: Turn on the Smart Water Ions Sensor Board and reads the Ions sensor
 *  connected in the SOCKET4 printing the result through the USB
 *  In this case we are going to measure Chloride Ion, but all Ions
 *  can be connected in the four available sockets
 *  
 *  Copyright (C) 2015 Libelium Comunicaciones Distribuidas S.L. 
 *  http://www.libelium.com 
 *  
 *  This program is free software: you can redistribute it and/or modify 
 *  it under the terms of the GNU General Public License as published by 
 *  the Free Software Foundation, either version 3 of the License, or 
 *  (at your option) any later version. 
 *  
 *  This program is distributed in the hope that it will be useful, 
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of 
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 *  GNU General Public License for more details. 
 *  
 *  You should have received a copy of the GNU General Public License 
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>. 
 *  
 *  Version:           1.0
 *  Design:            David Gascón 
 *  Implementation:    Ahmad Saad
 */

#include <smartWaterIons.h>

// Connect the Chloride Sensor in the SOCKET4
// All Ion sensors can be connected in the four sockets
socket4Class ChlorideSensor;

// Calibration concentrations solutions used in the process
#define point1 10.0
#define point2 100.0
#define point3 1000.0

// Calibration Voltage values
#define point1_volt_Cl 3.115
#define point2_volt_Cl 2.834
#define point3_volt_Cl 2.557

// Define the number of calibration points
#define numPoints 3

float calConcentrations[] = {point1, point2, point3};
float calVoltages[] = {point1_volt_Cl, point2_volt_Cl, point3_volt_Cl}; 

void setup()
{
  // Turn ON the Smart Water Ions Board and USB
  SWIonsBoard.ON();
  USB.ON();  

  // Calculate the slope and the intersection of the logarithmic function
  ChlorideSensor.setCalibrationPoints(calVoltages, calConcentrations, numPoints);
}

void loop()
{
  // Reading of the Chloride sensor
  float chlorideVoltage = ChlorideSensor.read();

  // Print of the results
  USB.print(F(" Chloride Voltage: "));
  USB.print(chlorideVoltage);
  USB.print(F("volts |"));

  float concentration = ChlorideSensor.calculateConcentration(chlorideVoltage);

  USB.print(F(" Chloride concentration Estimated: "));
  USB.print(concentration);
  USB.println(F(" ppm / mg * L-1"));

  delay(1000);  
}



Output

E#
Chloride Voltage: 2.2056250572volts | Chloride concentration Estimated: 18072.1503906250 ppm / mg * L-1
Chloride Voltage: 2.2055625915volts | Chloride concentration Estimated: 18081.4589843750 ppm / mg * L-1
Chloride Voltage: 2.2054998874volts | Chloride concentration Estimated: 18090.8300781250 ppm / mg * L-1

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