Development

Sensors / Gases Board:

» Ga 02: Humidity Sensor Reading

In this example the Gases 2.0 board is turned on and the 808H5V5 humidity sensor read every sixteen seconds (fifteen seconds waiting for the sensor time response, one second with the board off) approximately, printing the result through the USB.

Required Materials

1 x Waspmote
1 x Battery
1 x Coin cell
1 x Gases 2.0 board
1 x Humidity sensor (808H5V5)

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

Code

/*  
 *  ------ [Ga_2] - Humidity Sensor for Gases v20-------- 
 *  
 *  Explanation: Turn on the Gases Board v20 and read the humidity
 *  sensor every sixteen seconds, 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>

// Variable to store the read humidity value
float humidityVal;

void setup()
{
  // Turn on the USB and print a start message
  USB.ON();
  USB.println(F("start"));
  delay(100);
}
 
void loop()
{
  // Turn on the sensor board and wait for stabilization and sensor response time
  SensorGasv20.ON();
  delay(15000); 
 
  // Read the sensor 
  humidityVal = SensorGasv20.readValue(SENS_HUMIDITY);
  
  // Turn off the sensor board
  SensorGasv20.OFF();
  
  // Print the result through the USB
  USB.print(F("Humidity: "));
  USB.print(humidityVal);
  USB.println(F("%RH"));
  
  delay(1000);
}

Output

B#
start
Humidity: 39.5768241882%RH
Humidity: 37.8425216674%RH
Humidity: 37.4956588745%RH

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