Development

» GP v30 03 – Pellistor gas sensors

his is the basic code to manage and read the pellistor sensor. These sensors include: methane (CH4) and other combustible gases.

Required Materials

1 x Waspmote
1 x Battery
1 x Gases PRO board v30
1 x Temperature, Humidity and Pressure sensor BME280
1 x Pellistor Gas Sensor [Calibrated]

Notes

- Remember to connect the battery to Waspmote for proper operation.
- The connection of the sensor is described in the Gases PRO v30 technical guide.
- Cycle time: 5 minutes

Code

/*  
 *  ------------  [GP_v30_03] - Pellistor gas sensors  -------------- 
 *  
 *  Explanation: This is the basic code to manage and read the 
 *  pellistor sensor. These sensors include: methane (CH4)
 *  and other combustible gases. 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 <WaspSensorGas_Pro.h>

/*
 * Define object for sensor: gas_PRO_sensor
 * Input to choose board socket. 
 * Waspmote OEM. Possibilities for this sensor:
 * 	- SOCKET_1
 * P&S! Possibilities for this sensor:
 * 	- SOCKET_A
 * 	- 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("Pellistor CH4 example"));
}


void loop()
{
    ///////////////////////////////////////////
    // 1. Turn on the sensors
    /////////////////////////////////////////// 

    // Power on the pellistor sensor. 
    // If the gases PRO board is off, turn it on automatically.
    gas_PRO_sensor.ON();

    // The sensor needs time to warm up and get a response from gas
    // To reduce the battery consumption, use deepSleep instead delay
    // After 60 seconds, Waspmote wakes up thanks to the RTC Alarm
    PWR.deepSleep("00:00:01:00", RTC_OFFSET, RTC_ALM1_MODE1, ALL_ON);


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

    // Read the pellistor 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(" % LEL"));
    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 pellistor sensor.
    // If there aren't more gas sensor powered, turn off the board automatically
    gas_PRO_sensor.OFF();


    ///////////////////////////////////////////
    // 5. Sleep
    /////////////////////////////////////////// 

    // Go to deepsleep	
    // After 4 minutes, Waspmote wakes up thanks to the RTC Alarm
    PWR.deepSleep("00:00:04:00", RTC_OFFSET, RTC_ALM1_MODE1, ALL_OFF);

}

Output

H#
Pellistor CH4 example
***************************************
Gas concentration: 3.9870300292 % LEL
Temperature: 23.8199996948 Celsius degrees
RH: 43.7714843750 %
Pressure: 99773.6250000000 Pa
***************************************
Gas concentration: 39299316406 % LEL
Temperature: 23.8299999237 Celsius degrees
RH: 43.8017578125 %
Pressure: 99769.9531250000 Pa
***************************************
Gas concentration: 3.9109802246 % LEL
Temperature: 23.8099994659 Celsius degrees
RH: 43.8007812500 %
Pressure: 99775.3281250000 Pa
***************************************
Gas concentration: 3.9679870605 % LEL
Temperature: 23.8600006103 Celsius degrees
RH: 43.7880859375 %
Pressure: 99768.2500000000 Pa

Quick Publish: