Development

» SCP v30 02 – NDIR gas sensors

This is the basic code to manage and read the NDIR gas sensor with Smart Cities PRO board. These sensors include: CO2.

Required Materials

1 x Waspmote
1 x Battery
1 x Smart Cities PRO board
1 x Temperature, Humidity and Pressure sensor BME280
1 x NDIR Gas Sensor [Calibrated]

Notes

- Remember to connect the battery to Waspmote for proper operation.
- The connection of the sensor is described in the Smart Cities PRO technical guide.
- Cycle time: 5 minutes

Code

/*  
 *  ------------ [SCP_v30_02] - NDIR gas sensors ------------
 *  
 *  Explanation: This is the basic code to manage and read the NDIR
 *  gas sensor with Smart Cities PRO board. 
 *  These sensors include: CO2. Cycle time: 5 minutes
 *  
 *  Copyright (C) 2016 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:           3.1
 *  Design:            David Gascón 
 *  Implementation:    Alejandro Gállego
 */

#include <WaspSensorCities_PRO.h>
#include <WaspSensorGas_Pro.h>

/*
 * Define object for sensor: gas_PRO_sensor
 * Input to choose board socket. 
 * Waspmote OEM. Possibilities for this sensor:
 * 	- SOCKET_1 
 * 	- SOCKET_3
 * 	- SOCKET_5
 * P&S! Possibilities for this sensor:
 * 	- SOCKET_B
 * 	- SOCKET_C
 * 	- SOCKET_F
 */
Gas gas_PRO_sensor(SOCKET_1);

float concentration;	// Stores the concentration level in ppm
float temperature;	// Stores the temperature in ºC
float humidity;		// Stores the realitve humidity in %RH
float pressure;		// Stores the pressure in Pa

void setup()
{
    USB.println(F("NDIR CO2 example"));
    USB.println(F("A temperature, humidity and pressure sensor in socket 2 is also required"));
	
}	


void loop()
{		
    ///////////////////////////////////////////
    // 1. Power on  sensors
    ///////////////////////////////////////////  
	
	// Power on the socket 1 for the gas sensor
	SensorCitiesPRO.ON(SOCKET_1);
	// Power on the socket 2 for the temperature sensor
	SensorCitiesPRO.ON(SOCKET_2);
    // Power on the NDIR sensor. 
    // If the gases PRO board is off, turn it on automatically.
    gas_PRO_sensor.ON();

    // NDIR gas sensor needs a warm up time at least 120 seconds	
    // To reduce the battery consumption, use deepSleep instead delay
    // After 2 minutes, Waspmote wakes up thanks to the RTC Alarm
    PWR.deepSleep("00:00:02:00", RTC_OFFSET, RTC_ALM1_MODE1, ALL_ON);


    ///////////////////////////////////////////
    // 2. Read sensors
    ///////////////////////////////////////////  

    // Read the NDIR sensor and compensate with the temperature internally
    concentration = gas_PRO_sensor.getConc();

    // Read enviromental variables
    temperature = gas_PRO_sensor.getTemp();
    humidity = gas_PRO_sensor.getHumidity();
    pressure = gas_PRO_sensor.getPressure();

    // And print the values via USB
    USB.println(F("***************************************"));
    USB.print(F("Gas concentration: "));
    USB.print(concentration);
    USB.println(F(" ppm"));
    USB.print(F("Temperature: "));
    USB.print(temperature);
    USB.println(F(" Celsius degrees"));
    USB.print(F("RH: "));
    USB.print(humidity);
    USB.println(F(" %"));
    USB.print(F("Pressure: "));
    USB.print(pressure);
    USB.println(F(" Pa"));


    ///////////////////////////////////////////
    // 3. Power off sensors
    ///////////////////////////////////////////  

    // Power off the NDIR sensor.
    gas_PRO_sensor.OFF();
	// Power off the socket 1
	SensorCitiesPRO.OFF(SOCKET_1);
	// Power off the socket 2
	SensorCitiesPRO.OFF(SOCKET_2);
	
	
    ///////////////////////////////////////////
    // 4. Sleep
    /////////////////////////////////////////// 

    // Go to deepsleep. 	
    // After 3 minutes, Waspmote wakes up thanks to the RTC Alarm
    PWR.deepSleep("00:00:03:00", RTC_OFFSET, RTC_ALM1_MODE1, ALL_OFF);

}

Output

H#
NDIR CO2 example
A temperature, humidity and pressure sensor in socket 2 is also required
***************************************
Gas concentration: 501.2615509033 ppm
Temperature: 24.1200008392 Celsius degrees
RH: 43.4667968750 %
Pressure: 99747.5156250000 Pa
***************************************
Gas concentration: 520.9670228958 ppm
Temperature: 24.1100006103 Celsius degrees
RH: 43.4775390625 %
Pressure: 99747.5156250000 Pa
***************************************
Gas concentration: 531.9474477767 ppm
Temperature: 24.1100006103 Celsius degrees
RH: 43.4775390625 %
Pressure: 99752.0312500000 Pa
***************************************
Gas concentration: 512.8955001831 ppm
Temperature: 24.1200008392 Celsius degrees
RH: 43.4882812500 %
Pressure: 99745.7812500000 Pa

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