Development

» MR-SM 04: Load Cell Sensor Reading

In this example the Smart Metering sensor board is turned on, the load cell placed on socket 9 powered at 5V and read approximately every six seconds, printing results through the USB port.

Required Materials

1 x Waspmote
1 x Battery
1 x Smart Metering PRO board
1 x Load Cell sensor

Notes

* Remember to connect the battery to Waspmote for proper operation.
* The connection of the sensor is described in the SmartMetering technical guide.
* When turning on the load cell sensor you will be powering all the low consumption group sensors. See the SmartMetering board technical guide for more information.
* Logger, Common and SmartMetering assemblies must be loaded in the mote.
* Please note that the output is in hexadecimal.
* Please note that Float.toLong() method has been used with a precission of 2 decimals. For example, a 3413 output in decimal base means 34.13. For more information of Float class, see http://localhost:5000/gac/saguaro-system-11.3.htm?fqn=r:com.ibm.saguaro.system.Float
* To compile this example: mrc --assembly=lc-1.0 --system=waspmote --ref=logger-#.# --ref=/common-1.0 --ref=/smartmetering-1.0 LCellExample.java

Code

/**
 *  Copyright (C) 2013 Libelium Comunicaciones Distribuidas S.L.
 * http://www.libelium.com
 *
 * This program and the accompanying materials
 * are made available under the terms of the GNU Lesser General Public License
 * (LGPL) version 3.0 which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl-3.0.html
 *
 *  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/>.
 * 
 * Design: David Gascón
 * 
 * @version 0.1
 * @author Anartz Nuin Jiménez and Ignacio Ruiz Martín
 */
package com.libelium.examples.smartmetering;


import com.ibm.saguaro.logger.Logger;
import com.ibm.saguaro.system.Float;
import com.ibm.saguaro.system.GPIO;
import com.ibm.saguaro.system.Mote;
import com.ibm.saguaro.system.Time;
import com.ibm.saguaro.system.Timer;
import com.ibm.saguaro.system.TimerEvent;
import com.ibm.saguaro.system.csr;
import com.libelium.common.Constants;
import com.libelium.common.Gpio;
import com.libelium.smartmetering.SmartMetering;

public class LCellExample {
	static Timer timer;
	static SmartMetering sm = new SmartMetering();
	static GPIO gpio = Gpio.getInstance();
	
	static{

		sm.ON();
		
		sm.setSensorMode(Constants.SENS_ON, Constants.SENS_SMART_LCELLS_5V);

		timer = new Timer();
		
		timer.setCallback(new TimerEvent(null){
        		public void invoke(byte param, long time){
        			LCellExample.timeCallback(param,time);
        		}
        	});
	
        long INTERVAL = Time.toTickSpan(Time.MILLISECS,1000);
    	timer.setAlarmBySpan(INTERVAL);
    	
	}
	
	protected static void timeCallback(byte param, long time) {
		long lcell = sm.readValue(Constants.SENS_SMART_LCELLS_5V);
		
		Logger.appendString(csr.s2b("Load cell measurement: "));
		Logger.appendHexLong(Float.toLong(lcell, (byte)2));
		Logger.flush(Mote.INFO);
		
	}
}

Output

category: log
evname: MAPP
id: 7d
time: 11:21:10.830'000
severity: 5
module: MAPP
logmsg: MAPP: Load cell measurement: 00000007B

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