Development

Sensors / Gases Board:

» Ga 11: CO Sensor on Socket4 Reading

In this example the Gases 2.0 board is turned on, reading the CO sensor placed on socket4 every second while printing the output voltage and sensor resistance through the USB.

Required Materials

1 x Waspmote
1 x Battery
1 x Coin cell
1 x Gases 2.0 board
1 x CO sensor (TGS2442)

Notes

* Remember to connect the battery to Waspmote for proper operation.
* The connection of the sensor is described in the Gases 2.0 technical guide.
* The sensor gain and load resistor have been adjusted to operate with a given unit of a TGS2442 sensor, they will depend on the sensor used and the application, for more information about how to select this parameters take a look at the Gases 2.0 board technical guide.

Code

/*  
 *  ------ [Ga_11] - CO sensor Reading for Gases v20-------- 
 *  
 *  Explanation: Turn on the Gases Board v20 and reads the CO sensor
 *  placed on socket 4 every second, printing the result
 *  through the USB
 *  
 *  Copyright (C) 2012 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:           0.1 
 *  Design:            David Gascón 
 *  Implementation:    
 */

#include <WaspSensorGas_v20.h>

#define GAIN  1      // GAIN of the sensor stage
#define RESISTOR 100  // LOAD RESISTOR of the sensor stage

// Variable to store the read CO value
float coVal;

void setup()
{
  // Turn on the USB and print a start message
  USB.ON();
  USB.println(F("start"));
  delay(100);

  // Turn on the sensor board
  SensorGasv20.ON();

  // Turn on the RTC
  RTC.ON();

  // Configure the CO sensor on socket 4
  SensorGasv20.configureSensor(SENS_SOCKET4CO, GAIN, RESISTOR);
  
}
 
void loop()
{
  
  // Read the sensor 
  coVal = SensorGasv20.readValue(SENS_SOCKET4CO);
  
  // Print the result through the USB
  USB.print(F("CO: "));
  USB.print(coVal);
  USB.print(F("V - "));

  // Conversion from voltage into kiloohms  
  coVal = SensorGasv20.calculateResistance(SENS_SOCKET4CO, coVal, GAIN, RESISTOR);
  USB.print(coVal);
  USB.println(F("kohms"));
  
  delay(1000);
}

Output

B#
start
CO: 0.1612903118V - 3374.9675292968kohms
CO: 0.1612903118V - 3374.9675292968kohms
CO: 0.1612903118V - 3374.9675292968kohms
CO: 0.1612903118V - 3374.9675292968kohms

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