Development

Sensors / Agriculture Board:

» Ag 11: Watermark Sensor

In this example the Agriculture 2.0 sensor board is turned on and the Soil Moisture sensor, placed on its first socket, read every second (the sensor reading time must be added to this time) approximately, printing the result through the USB port.

Required Materials

1 x Waspmote
1 x Battery
1 x Coin cell
1 x Agriculture 2.0 board or Agriculture PRO 2.0 board
1 x Soil Moisture sensor (Watermark)

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.
* When turning on the temperature sensor you will be powering all the low consumption group sensors. See the Agriculture 2.0 board technical guide for more information.
* To read a Soil Moisture sensor on any of the other two connectors you just have to replace the socket name in the readValue function.

Code

/*  
 *  --[Ag_11] - Reading the Watermark at Agriculture v20 board-- 
 *  
 *  Explanation: Turn on the Agriculture v20 board and read the 
 *  Watermark 1 sensor on it once every 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_WATERMARK_1);
  delay(100);
  
  // Read the Watermark 1 sensor 
  value = SensorAgrv20.readValue(SENS_AGR_WATERMARK_1);
  
  // Turn off the sensor
  SensorAgrv20.setSensorMode(SENS_OFF, SENS_AGR_WATERMARK_1);
  
  // Part 2: USB printing
  // Print the Soil Moisture value through the USB
  USB.print(F("Frequency: "));
  USB.print(value);
  USB.println(F("Hz"));
  
  delay(1000);
}

Output

B#
start
Frequency: 51.4257812500Hz
Frequency: 186.5845642089Hz
Frequency: 4219.4091796875Hz
Frequency: 5277.0449218750Hz
Frequency: 6006.0058593750Hz
Frequency: 6644.5180664062Hz
Frequency: 7299.2700195312Hz
Frequency: 7604.5625000000Hz
Frequency: 7662.8354492187Hz
Frequency: 7692.3076171875Hz
Frequency: 7722.0078125000Hz

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