Development

Sensors / Gases PRO Board:

» GP 11: H2S

This is the basic code to manage and read the hydrogen sulfide (H2S) gas sensor. The concentration and the enviromental variables will be stored in a frame. Cycle time: 5 minutes

Required Materials

1 x Waspmote
1 x Battery
1 x Gases PRO board
1 x Temperature, Humidity and Pressure sensor BME280
1 x H2S 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 technical guide.
Cycle time: 5 minutes

Code

/*  
 *  ------------  [GP_11] - H2S  -------------- 
 *  
 *  Explanation: This is the basic code to manage and read the hydrogen 
 *  sulfide (H2S) gas sensor. The concentration and the enviromental variables
 *  will be stored in a frame. Cycle time: 5 minutes. 
 *  
 *  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:           0.1 
 *  Design:            David Gascón 
 *  Implementation:    Alejandro Gállego
 */

#include <WaspSensorGas_Pro.h>
#include <WaspFrame.h>

/*
 * Define object for sensor: H2S
 * Input to choose board socket. 
 * Waspmote OEM. Possibilities for this sensor:
 * 	- SOCKET_1 
 * 	- SOCKET_2
 * 	- SOCKET_3
 * 	- SOCKET_4
 * 	- SOCKET_5
 * 	- SOCKET_6
 * P&S! Possibilities for this sensor:
 * 	- SOCKET_A
 * 	- SOCKET_B
 * 	- SOCKET_C
 * 	- SOCKET_F
 */
Gas H2S(SOCKET_2);

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

char node_ID[] = "H2S_example";

void setup()
{
	USB.println(F("H2S example"));
	// Set the Waspmote ID
	frame.setID(node_ID);
}	


void loop()
{
	///////////////////////////////////////////
	// 1. Turn on the sensors
	/////////////////////////////////////////// 
	
	// Power on the H2S sensor. 
	// If the gases PRO board is off, turn it on automatically.
	H2S.ON();
	
	// The sensor needs time to warm up and get a response from gas
	// 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 H2S sensor and compensate with the temperature internally
	concentration = H2S.getConc();
	
	// Read enviromental variables
	temperature = H2S.getTemp();
	humidity = H2S.getHumidity();
	pressure = H2S.getPressure();
	
	
	///////////////////////////////////////////
	// 3. Turn off the sensors
	/////////////////////////////////////////// 
	
	// Power off the H2S sensor. If there aren't more gas sensors powered, 
	// turn off the board automatically
	H2S.OFF();
	
	
	///////////////////////////////////////////
	// 4. Create ASCII frame
	/////////////////////////////////////////// 
	
	// Create new frame (ASCII)
	frame.createFrame(ASCII);
	
	// Add H2S concentration
	frame.addSensor(SENSOR_GP_H2S, concentration);
	// Add temperature
	frame.addSensor(SENSOR_GP_TC, temperature);
	// Add humidity
	frame.addSensor(SENSOR_GP_HUM, humidity);
	// Add pressure
	frame.addSensor(SENSOR_GP_PRES, pressure);	
	
	// Show the frame
	frame.showFrame();
	
	
	///////////////////////////////////////////
	// 5. 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

E#
H2S example
===============================
Current ASCII Frame:
Length: 83
Frame Type: 128
frame (HEX): 3C3D3E800423333832353337333638234832535F6578616D706C6523332347505F4832533A302E3239362347505F54433A32382E3731302347505F48554D3A34302E34332347505F505245533A393830373523
frame (STR): <=>€#382537368#H2S_example#3#GP_H2S:0.296#GP_TC:28.710#GP_HUM:40.43#GP_PRES:98075#
===============================
===============================
Current ASCII Frame:
Length: 83
Frame Type: 128
frame (HEX): 3C3D3E800423333832353337333638234832535F6578616D706C6523342347505F4832533A302E3039352347505F54433A32382E3730302347505F48554D3A34302E34392347505F505245533A393830373823
frame (STR): <=>€#382537368#H2S_example#4#GP_H2S:0.095#GP_TC:28.700#GP_HUM:40.49#GP_PRES:98078#
===============================

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