Development v12

Warning - Product Update

All the resources present on this section belong to Waspmote v12, Waspmote Plug & Sense! v12 and Meshlium v3.8.

If you have a Waspmote v15, Waspmote Plug & Sense! v15 or Meshlium v4.0 please go to the new Development Section.

Check what is your version and what are the differences between the old and the new one in this document.

» Ag 03: Atmospheric Pressure

In this example the Agriculture 2.0 sensor board is turned on and the pressure sensor read every second approximately, printing the result through the USB port.

Required Materials

1 x Waspmote
1 x Battery
1 x Agriculture 2.0 board or Agriculture PRO 2.0 board
1 x Atmospheric Pressure sensor (MPX4115A)

Notes

* Remember to connect the battery to Waspmote for proper operation.
* The connection of the sensor is described in the Agriculture 2.0 technical guide.
* The output of this sensor may sometimes be noisy, in this case a software filtering will be advisable
* Remember the atmospheric pressure value obtained is absolute, it will be necessary a conversion in function of height
* This example can only be executed in Waspmote v12

Code

/*  
 *  --[Ag_3] - Reading the Atmospheric Pressure sensor at Agriculture v20 board-- 
 *  
 *  Explanation: Turn on the Agriculture v20 board and read the Atmospheric
 *  Pressure sensor second
 *  
 *  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:    Manuel Calahorra
 */

#include <WaspSensorAgr_v20.h>

// Variable to store the read value
float value;

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

  // Turn on the sensor board
  SensorAgrv20.ON();
  
  // Turn on the RTC
  RTC.ON();
  
}
 
void loop()
{
  // Part 1: Sensor reading
  // Turn on the sensor and wait for stabilization and response time
  SensorAgrv20.setSensorMode(SENS_ON, SENS_AGR_PRESSURE);
  delay(100);
  
  // Read the atmospheric pressure sensor 
  value = SensorAgrv20.readValue(SENS_AGR_PRESSURE);
  
  // Turn off the sensor
  SensorAgrv20.setSensorMode(SENS_OFF, SENS_AGR_PRESSURE);
  
  // Part 2: USB printing
  // Print the pressure value through the USB
  USB.print(F("Pressure: "));
  USB.print(value);
  USB.println(F("kPa"));
  
  delay(1000);
}

Output

B#
start
Pressure: 108.8184280395kPa
Pressure: 108.8184280395kPa
Pressure: 108.5740432739kPa
Pressure: 108.8184280395kPa

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