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Sensors / Smart Metering Board:

» SM 07: Ultrasound Sensor on 3V3 Socket Reading

In this example the Smart Metering sensor board is turned on and the ultrasound 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 Ultrasound sensor (XL-MaxSonar-WRA1)

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.
* To use the LV-MaxSonar-EZ0 sensor replace SENS_US_WRA1 by SENS_US_EZ0 in the readValue call.

Code

/*  
 *  --[SM_7] - Reading the Ultrasound Sensor connected to the 3.3V socket on Smart Metering v20 board-- 
 *  
 *  Explanation: Turn on the Ultrasound WRA1 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_US_3V3);
  delay(1000);
  
  // Read the ultrasound sensor 
  value = SensorSmartv20.readValue(SENS_SMART_US_3V3, SENS_US_WRA1);
  
  // Turn off the sensor
  SensorSmartv20.setSensorMode(SENS_OFF, SENS_SMART_US_3V3);
  
  // Part 2: USB printing
  // Print the distance value through the USB
  USB.print(F("Distance: "));
  USB.print(value);
  USB.println(F("cm"));
  
  delay(1000);
}

Output

B#
start
Distance: 180.4435577392cm
Distance: 180.4435577392cm
Distance: 28.2258052825cm
Distance: 178.4274139404cm
Distance: 178.4274139404cm

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