Development

Sensors / Smart Metering Board:

» SM 09: Linear Displacement Sensor on 3V3 Socket Reading

In this example the Smart Metering sensor board is turned on and the foil displacement sensor, placed on socket 3, read every second approximately, printing the result through the USB port.

Required Materials

1 x Waspmote
1 x Battery
1 x Coin cell
1 x Smart Metering board
1 x Foil displacement sensor

Notes

* Remember to connect the battery to Waspmote for proper operation.
* The connection of the sensor is described in the Smart Cities technical guide.
* Take into account that when powering socket 3 you will be turning on also socket 2.

Code

/*  
 *  --[SM_9] - Reading the Displacement Foil Sensor connected to the 3.3V socket on Smart Metering v20 board-- 
 *  
 *  Explanation: Turn on the Displacement Foil sensor every two seconds, taking a
 *               measurement and printing its result through the USB port.
 *  
 *  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 <WaspSensorSmart_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
  SensorSmartv20.ON();
  
  // Turn on the RTC
  RTC.ON();
  
}
 
void loop()
{
  // Part 1: Sensor reading
  // Turn on the sensor and wait for stabilization and response time
  SensorSmartv20.setSensorMode(SENS_ON, SENS_SMART_DFS_3V3);
  delay(10);
  
  // Read the displacement foil sensor 
  value = SensorSmartv20.readValue(SENS_SMART_DFS_3V3);
  
  // Turn off the sensor
  SensorSmartv20.setSensorMode(SENS_OFF, SENS_SMART_DFS_3V3);
  
  // Part 2: USB printing
  // Print the voltage value through the USB
  USB.print(F("Voltage: "));
  USB.print(value);
  USB.println(F("V"));
  
  delay(1000);
}

Output

B#
start
Voltage: 0.0000000000V
Voltage: 0.2322580575V
Voltage: 0.3741935491V
Voltage: 0.5741935253V
Voltage: 0.7419354915V
Voltage: 1.0580645799V
Voltage: 1.2838709354V
Voltage: 1.5290322303V
Voltage: 1.8225807189V
Voltage: 2.0806450843V
Voltage: 2.3903226852V
Voltage: 2.8451612472V
Voltage: 2.8870968818V

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