Moved raspberry pi plugin into its own plugin folder

plugins/raspberry/build.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project name="RaspberryPi Plugin" >
+
+    <!-- ________________________ PROPERTIES AND SETTINGS ________________________ -->
+
+    <!--common properties-->
+    <property name="root" value="." />
+    <property name="srcDir" value="${root}/src" />
+    <property name="testDir" value="${root}/test" />
+    <property name="libDir" value="${root}/lib" />
+
+    <property name="buildRoot" value="${root}/build" />
+    <property name="compileDir" value="${buildRoot}/production" />
+    <property name="compileTestDir" value="${buildRoot}/test" />
+    <property name="releaseDir" value="${buildRoot}/release" />
+    <property name="releaseJar" value="raspberry.jar" />
+    <property name="reportsDir" value="../../${buildRoot}/reports" /> <!-- Use Hal reports folder -->
+
+    <!-- ________________________ TARGETS ________________________ -->
+
+    <import file="../../build_plugin.xml"/>
+
+</project>

plugins/raspberry/lib/pi4j.LICENSE.txt

@@ -0,0 +1,165 @@
+		   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
+
+  A "Combined Work" is a work produced by combining or linking an
+Application with the Library.  The particular version of the Library
+with which the Combined Work was made is also called the "Linked
+Version".
+
+  The "Minimal Corresponding Source" for a Combined Work means the
+Corresponding Source for the Combined Work, excluding any source code
+for portions of the Combined Work that, considered in isolation, are
+based on the Application, and not on the Linked Version.
+
+  The "Corresponding Application Code" for a Combined Work means the
+object code and/or source code for the Application, including any data
+and utility programs needed for reproducing the Combined Work from the
+Application, but excluding the System Libraries of the Combined Work.
+
+  1. Exception to Section 3 of the GNU GPL.
+
+  You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+  2. Conveying Modified Versions.
+
+  If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
+facility is invoked), then you may convey a copy of the modified
+version:
+
+   a) under this License, provided that you make a good faith effort to
+   ensure that, in the event an Application does not supply the
+   function or data, the facility still operates, and performs
+   whatever part of its purpose remains meaningful, or
+
+   b) under the GNU GPL, with none of the additional permissions of
+   this License applicable to that copy.
+
+  3. Object Code Incorporating Material from Library Header Files.
+
+  The object code form of an Application may incorporate material from
+a header file that is part of the Library.  You may convey such object
+code under terms of your choice, provided that, if the incorporated
+material is not limited to numerical parameters, data structure
+layouts and accessors, or small macros, inline functions and templates
+(ten or fewer lines in length), you do both of the following:
+
+   a) Give prominent notice with each copy of the object code that the
+   Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the object code with a copy of the GNU GPL and this license
+   document.
+
+  4. Combined Works.
+
+  You may convey a Combined Work under terms of your choice that,
+taken together, effectively do not restrict modification of the
+portions of the Library contained in the Combined Work and reverse
+engineering for debugging such modifications, if you also do each of
+the following:
+
+   a) Give prominent notice with each copy of the Combined Work that
+   the Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the Combined Work with a copy of the GNU GPL and this license
+   document.
+
+   c) For a Combined Work that displays copyright notices during
+   execution, include the copyright notice for the Library among
+   these notices, as well as a reference directing the user to the
+   copies of the GNU GPL and this license document.
+
+   d) Do one of the following:
+
+       0) Convey the Minimal Corresponding Source under the terms of this
+       License, and the Corresponding Application Code in a form
+       suitable for, and under terms that permit, the user to
+       recombine or relink the Application with a modified version of
+       the Linked Version to produce a modified Combined Work, in the
+       manner specified by section 6 of the GNU GPL for conveying
+       Corresponding Source.
+
+       1) Use a suitable shared library mechanism for linking with the
+       Library.  A suitable mechanism is one that (a) uses at run time
+       a copy of the Library already present on the user's computer
+       system, and (b) will operate properly with a modified version
+       of the Library that is interface-compatible with the Linked
+       Version.
+
+   e) Provide Installation Information, but only if you would otherwise
+   be required to provide such information under section 6 of the
+   GNU GPL, and only to the extent that such information is
+   necessary to install and execute a modified version of the
+   Combined Work produced by recombining or relinking the
+   Application with a modified version of the Linked Version. (If
+   you use option 4d0, the Installation Information must accompany
+   the Minimal Corresponding Source and Corresponding Application
+   Code. If you use option 4d1, you must provide the Installation
+   Information in the manner specified by section 6 of the GNU GPL
+   for conveying Corresponding Source.)
+
+  5. Combined Libraries.
+
+  You may place library facilities that are a work based on the
+Library side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+   a) Accompany the combined library with a copy of the same work based
+   on the Library, uncombined with any other library facilities,
+   conveyed under the terms of this License.
+
+   b) Give prominent notice with the combined library that part of it
+   is a work based on the Library, and explaining where to find the
+   accompanying uncombined form of the same work.
+
+  6. Revised Versions of the GNU Lesser General Public License.
+
+  The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+  Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+  If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.

plugins/raspberry/lib/pi4j.NOTICE.txt

@@ -0,0 +1,33 @@
+   =========================================================================
+   Pi4J :: Java library for Raspberry Pi
+   =========================================================================
+
+   Pi4J Library
+   Copyright (C) 2012-2016 Pi4J.com
+
+   This product includes software developed at:
+   The Pi4J Project (http://www.pi4j.com/).
+
+   This product was originally authored by: Robert Savage
+
+   This software is licensed under the GNU LGPLv3 license.
+   More information about licensing terms can be found at:
+     http://pi4j.com/license.html
+
+   Additional information about this project and its authors can be found at:
+   - http://www.pi4j.com/
+   - http://www.raspicentral.com
+   - http://www.savagehomeautomation.com
+
+   This software compiles against libraries from the WiringPi project.
+   The Wiring Pi project is provided by Gordon Henderson and is available
+   from
+     http://wiringpi.com/
+
+   The WiringPi project is licensed under the GNU LGPLv3 license
+     http://www.gnu.org/licenses/lgpl.html
+
+   =========================================================================
+   Subject to the terms of the software license, this NOTICE file must be
+   included in any Derivative Works that You distribute as a readable copy.
+   (Section 4d)

plugins/raspberry/src/se/hal/plugin/raspberry/RPiController.java

@@ -0,0 +1,98 @@
+package se.hal.plugin.raspberry;
+
+import se.hal.intf.*;
+import se.hal.plugin.raspberry.hardware.RPiDS18B20;
+import se.hal.plugin.raspberry.hardware.RPiInteruptPulseFlankCounter;
+import zutil.log.LogUtil;
+
+import java.util.HashMap;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+public class RPiController implements HalSensorController {
+    private static final Logger logger = LogUtil.getLogger();
+
+    private HashMap<String, RPiSensor> pinToSensorMap = new HashMap<>();
+    private HalSensorReportListener sensorListener;
+
+    public RPiController(){
+        
+    }
+
+    @Override
+    public void initialize() throws Exception {
+
+    }
+
+    @Override
+    public void register(HalSensorConfig sensor) {
+        if(sensor instanceof RPiPowerConsumptionSensor){
+            RPiPowerConsumptionSensor powerConsumptionSensor = (RPiPowerConsumptionSensor) sensor;
+            int gpioPin = powerConsumptionSensor.getGpioPin();
+            if(!pinToSensorMap.containsKey("GPIO_"+gpioPin)){
+                RPiInteruptPulseFlankCounter impulseCounter = new RPiInteruptPulseFlankCounter(gpioPin, this);
+                pinToSensorMap.put("GPIO_"+gpioPin, impulseCounter);
+            }else{
+                logger.warning("Cannot create a RPiPowerConsumptionSensor on GPIO pin " + gpioPin + " since is already is in use by another sensor.");
+            }
+        } else if(sensor instanceof RPiTemperatureSensor){
+            RPiTemperatureSensor temperatureSensor = (RPiTemperatureSensor) sensor;
+            String w1Address = temperatureSensor.get1WAddress();
+            if(!pinToSensorMap.containsKey("W1_"+w1Address)){
+                RPiDS18B20 ds12b20 = new RPiDS18B20(w1Address, this);
+                pinToSensorMap.put("W1_"+w1Address, ds12b20);
+            }else{
+                logger.warning("Cannot create a RPi1WireTemperatureSensor on 1-Wire address " + w1Address + " since is already is in use by another sensor.");
+            }
+        }else{
+            logger.warning("Cannot register a non-supported sensor");
+        }
+    }
+
+    @Override
+    public void deregister(HalSensorConfig sensor) {
+        if(sensor instanceof RPiPowerConsumptionSensor){
+            RPiPowerConsumptionSensor powerConsumprtionSensor = (RPiPowerConsumptionSensor) sensor;
+            RPiSensor sensorToDeregister = pinToSensorMap.remove("GPIO_"+powerConsumprtionSensor.getGpioPin());
+            if(sensorToDeregister != null){
+                sensorToDeregister.close();
+            }
+        } else if(sensor instanceof RPiTemperatureSensor){
+            RPiTemperatureSensor temperatureSensor = (RPiTemperatureSensor) sensor;
+            RPiSensor sensorToDeregister = pinToSensorMap.remove("W1_"+temperatureSensor.get1WAddress());
+            if(sensorToDeregister != null){
+                sensorToDeregister.close();
+            }
+        }else{
+            logger.warning("Cannot deregister a non-supported sensor");
+            return;
+        }
+    }
+
+    @Override
+    public int size() {
+        return pinToSensorMap.size();
+    }
+
+    @Override
+    public void setListener(HalSensorReportListener listener) {
+        sensorListener = listener;
+    }
+
+    @Override
+    public void close() {
+        for(String key : this.pinToSensorMap.keySet()){
+            pinToSensorMap.get(key).close();
+            pinToSensorMap.remove(key);
+        }
+    }
+    
+    public void sendDataReport(HalSensorConfig sensorConfig, HalSensorData sensorData){
+        if(sensorListener != null){
+            sensorListener.reportReceived(sensorConfig, sensorData);
+        }else{
+            logger.log(Level.WARNING, "Could not report data. No registered listener");
+        }
+    }
+
+}

plugins/raspberry/src/se/hal/plugin/raspberry/RPiPowerConsumptionSensor.java

@@ -0,0 +1,56 @@
+package se.hal.plugin.raspberry;
+
+import se.hal.intf.HalSensorConfig;
+import se.hal.intf.HalSensorController;
+import se.hal.intf.HalSensorData;
+import se.hal.struct.devicedata.PowerConsumptionSensorData;
+import zutil.ui.Configurator;
+
+public class RPiPowerConsumptionSensor implements HalSensorConfig {
+
+    @Configurator.Configurable("GPIO-Pin")
+    private int gpioPin = -1;
+
+
+    public RPiPowerConsumptionSensor(){	} //need to be empty for the framework to create an instance
+    public RPiPowerConsumptionSensor(int gpioPin) {
+        this.gpioPin = gpioPin;
+    }
+
+
+
+    @Override
+    public long getDataInterval(){
+        return 60*1000; // 1 min
+    }
+
+    @Override
+    public AggregationMethod getAggregationMethod() {
+        return AggregationMethod.SUM;
+    }
+
+    @Override
+    public Class<? extends HalSensorController> getSensorControllerClass() {
+        return RPiController.class;
+    }
+
+    @Override
+    public Class<? extends HalSensorData> getSensorDataClass() {
+        return PowerConsumptionSensorData.class;
+    }
+
+    @Override
+    public boolean equals(Object obj){
+        if(obj instanceof RPiPowerConsumptionSensor)
+            return ((RPiPowerConsumptionSensor)obj).gpioPin == gpioPin;
+        return false;
+    }
+
+    public int getGpioPin() {
+        return gpioPin;
+    }
+
+    public String toString(){
+        return "gpioPin:" + gpioPin;
+    }
+}

plugins/raspberry/src/se/hal/plugin/raspberry/RPiSensor.java

@@ -0,0 +1,7 @@
+package se.hal.plugin.raspberry;
+
+public interface RPiSensor {
+
+    void close();
+
+}

plugins/raspberry/src/se/hal/plugin/raspberry/RPiTemperatureSensor.java

@@ -0,0 +1,53 @@
+package se.hal.plugin.raspberry;
+
+import se.hal.intf.HalSensorConfig;
+import se.hal.intf.HalSensorController;
+import se.hal.intf.HalSensorData;
+import se.hal.struct.devicedata.TemperatureSensorData;
+import zutil.ui.Configurator;
+
+public class RPiTemperatureSensor implements HalSensorConfig {
+
+    @Configurator.Configurable("1-Wire Address")
+    private String w1Address;
+
+
+
+    public RPiTemperatureSensor() { }
+    public RPiTemperatureSensor(String w1Address) {
+        this.w1Address = w1Address;
+    }
+
+
+    @Override
+    public long getDataInterval() {
+        return 10*60*1000; // 10 min
+    }
+
+    @Override
+    public AggregationMethod getAggregationMethod() {
+        return AggregationMethod.AVERAGE;
+    }
+
+    @Override
+    public Class<? extends HalSensorController> getSensorControllerClass() {
+        return RPiController.class;
+    }
+
+    @Override
+    public Class<? extends HalSensorData> getSensorDataClass() {
+        return TemperatureSensorData.class;
+    }
+
+    @Override
+    public boolean equals(Object obj){
+        if(obj instanceof RPiTemperatureSensor && w1Address != null)
+            return this.get1WAddress().equals(((RPiTemperatureSensor) obj).w1Address);
+        return false;
+    }
+
+    public String get1WAddress() {
+        return w1Address;
+    }
+
+}

plugins/raspberry/src/se/hal/plugin/raspberry/RPiUtility.java

@@ -0,0 +1,75 @@
+package se.hal.plugin.raspberry;
+
+import com.pi4j.io.gpio.Pin;
+import com.pi4j.io.gpio.RaspiPin;
+
+public class RPiUtility {
+
+    public static Pin getPin(int gpioPin){
+        switch(gpioPin){
+        case 0:
+            return RaspiPin.GPIO_00;
+        case 1:
+            return RaspiPin.GPIO_01;
+        case 2:
+            return RaspiPin.GPIO_02;
+        case 3:
+            return RaspiPin.GPIO_03;
+        case 4:
+            return RaspiPin.GPIO_04;
+        case 5:
+            return RaspiPin.GPIO_05;
+        case 6:
+            return RaspiPin.GPIO_06;
+        case 7:
+            //used by 1-wire divices
+        case 8:
+            //used by I2C devices
+        case 9:
+            //used by I2C devices
+        case 10:
+            //used by SPI devices
+        case 11:
+            //used by SPI devices
+        case 12:
+            //used by SPI devices
+        case 13:
+            //used by SPI devices
+        case 14:
+            //used by SPI devices
+        case 15:
+            //used by Serial devices
+        case 16:
+            //used by Serial devices
+        case 17:
+            //reserved for future use
+        case 18:
+            //reserved for future use
+        case 19:
+            //reserved for future use
+        case 20:
+            //reserved for future use
+        case 21:
+            //reserved for future use
+        case 22:
+            //reserved for future use
+        case 23:
+            //reserved for future use
+        case 24:
+            //reserved for future use
+        case 25:
+            //reserved for future use
+        case 26:
+            //reserved for future use
+        case 27:
+            //reserved for future use
+        case 28:
+            //reserved for future use
+        case 29:
+            //reserved for future use
+        default:
+            return null;
+    }
+    }
+
+}

plugins/raspberry/src/se/hal/plugin/raspberry/hardware/RPiDS18B20.java

@@ -0,0 +1,68 @@
+package se.hal.plugin.raspberry.hardware;
+
+import com.pi4j.component.temperature.TemperatureSensor;
+import com.pi4j.io.w1.W1Master;
+import com.pi4j.temperature.TemperatureScale;
+import se.hal.plugin.raspberry.RPiController;
+import se.hal.plugin.raspberry.RPiSensor;
+import se.hal.plugin.raspberry.RPiTemperatureSensor;
+import se.hal.struct.devicedata.TemperatureSensorData;
+import zutil.log.LogUtil;
+
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+import java.util.logging.Logger;
+
+public class RPiDS18B20 implements RPiSensor, Runnable {	
+    private static final Logger logger = LogUtil.getLogger();
+    private final String DEGREE_SIGN  = "\u00b0";
+
+    private RPiController controller;
+    private String w1Address;
+    private ScheduledExecutorService scheduler;
+    private W1Master w1Mater;
+
+    public RPiDS18B20(String w1Address, RPiController controller){
+        this.controller = controller;
+        this.w1Address = w1Address;
+
+        scheduler = Executors.newScheduledThreadPool(1);
+
+        w1Mater = new W1Master();
+
+        //print out all sensors found
+        for(TemperatureSensor device : w1Mater.getDevices(TemperatureSensor.class)){
+            logger.info(String.format("1-Wire temperature sensor divice found: %-20s: %3.1f"+DEGREE_SIGN+"C\n", device.getName(), device.getTemperature(TemperatureScale.CELSIUS)));
+        }
+
+        //schedule job
+        scheduler.scheduleAtFixedRate(this, 10, 60, TimeUnit.SECONDS);	//wait 10s and run every 60s
+
+    }
+    
+    public void close() {
+        scheduler.shutdown();
+        try {
+            scheduler.awaitTermination(5, TimeUnit.SECONDS);
+        } catch (InterruptedException e) {
+            //noop
+        }
+    }
+
+    @Override
+    public void run() {
+        for(TemperatureSensor device : w1Mater.getDevices(TemperatureSensor.class)){
+            if(device.getName().equals(w1Address)){
+                controller.sendDataReport(
+                        new RPiTemperatureSensor(w1Address),
+                        new TemperatureSensorData(
+                                device.getTemperature(TemperatureScale.CELSIUS),
+                                System.currentTimeMillis()
+                        ));
+                break;
+            }
+        }
+    }
+    
+}

plugins/raspberry/src/se/hal/plugin/raspberry/hardware/RPiInteruptPulseFlankCounter.java

@@ -0,0 +1,145 @@
+package se.hal.plugin.raspberry.hardware;
+
+import com.pi4j.io.gpio.*;
+import com.pi4j.io.gpio.event.GpioPinDigitalStateChangeEvent;
+import com.pi4j.io.gpio.event.GpioPinListenerDigital;
+import com.pi4j.wiringpi.GpioUtil;
+import se.hal.plugin.raspberry.RPiController;
+import se.hal.plugin.raspberry.RPiPowerConsumptionSensor;
+import se.hal.plugin.raspberry.RPiSensor;
+import se.hal.plugin.raspberry.RPiUtility;
+import se.hal.struct.devicedata.PowerConsumptionSensorData;
+import zutil.log.LogUtil;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+public class RPiInteruptPulseFlankCounter implements Runnable, GpioPinListenerDigital, RPiSensor {
+    private static final int REPORT_TIMEOUT = 60_000;   //one minute
+
+    private static final Logger logger = LogUtil.getLogger();
+
+    private RPiController controller;
+    private ExecutorService executorPool;
+    private long nanoSecondsSleep = REPORT_TIMEOUT * 1_000_000L;
+    private volatile Integer impulseCount = 0;
+    private GpioPinDigitalInput irLightSensor;
+    private final int gpioPin;
+
+    public RPiInteruptPulseFlankCounter(int gpioPin, RPiController controller){
+        this.controller = controller;
+        this.gpioPin = gpioPin;
+
+        // setup a thread pool for executing jobs
+        this.executorPool = Executors.newCachedThreadPool();
+
+    //Enable non privileged access to the GPIO pins (no sudo required from now)
+    GpioUtil.enableNonPrivilegedAccess();
+
+        // create gpio controller
+        GpioController gpio = null;
+        try{
+            gpio = GpioFactory.getInstance();
+        }catch(IllegalArgumentException e){
+            logger.log(Level.SEVERE, "", e);
+            throw e;
+        }catch(UnsatisfiedLinkError e){
+            logger.log(Level.SEVERE, "", e);
+            throw e;
+        }
+
+        // provision gpio pin as an input pin with its internal pull up resistor enabled
+        irLightSensor = gpio.provisionDigitalInputPin(RPiUtility.getPin(gpioPin), PinPullResistance.PULL_UP);
+
+        // create and register gpio pin listener. May require the program to be run as sudo if the GPIO pin has not been exported
+        irLightSensor.addListener(this);
+        
+        //start a daemon thread to save the impulse count every minute
+        Thread thread = new Thread(this);
+        thread.setDaemon(false);
+        thread.start();
+    }
+    
+    public void close() {
+        irLightSensor.removeListener(this);
+        executorPool.shutdown();
+    }
+    
+    /**
+     * GpioPinListenerDigital interface
+     */
+    @Override
+    public void handleGpioPinDigitalStateChangeEvent(GpioPinDigitalStateChangeEvent event) {
+        if(event.getState() == PinState.LOW){  //low = light went on
+            //System.out.println("IR LED turned ON");
+            //logger.log(Level.INFO, "IR LED turned on");
+            synchronized(impulseCount){
+                impulseCount++;
+            }
+        }
+    }
+    
+    @Override
+    public void run() {
+        long startTime = System.nanoTime();
+        synchronized(impulseCount){
+            impulseCount = 0;	//reset the impulse count
+        }
+        while(!executorPool.isShutdown()) {
+            sleepNano(nanoSecondsSleep);	//sleep for some time. This variable will be modified every loop to compensate for the loop time spent.
+            int count = -1;
+            synchronized(impulseCount){
+                count = impulseCount;
+                impulseCount = 0;
+            }
+            save(System.currentTimeMillis(), count);	//save the impulse count
+            long estimatedNanoTimeSpent = System.nanoTime() - startTime;  //this is where the loop ends
+            startTime = System.nanoTime();  //this is where the loop starts from now on
+            if(estimatedNanoTimeSpent > 0){  //if no overflow
+                long nanoSecondsTooMany = estimatedNanoTimeSpent - (REPORT_TIMEOUT*1000000L);
+                //System.out.println("the look took ~" + estimatedNanoTimeSpent + "ns. That is " + nanoSecondsTooMany/1000000L + "ms off");
+                nanoSecondsSleep -= nanoSecondsTooMany / 3;  //divide by constant to take into account varaiations im loop time
+            }
+        }
+    }
+
+    /**
+     * Sleep for [ns] nanoseconds
+     * @param ns
+     */
+    private void sleepNano(long ns){
+        //System.out.println("will go to sleep for " + ns + "ns");
+        try{
+            Thread.sleep(ns/1000000L, (int)(ns%1000000L));
+        }catch(InterruptedException e){
+            //ignore
+        }
+    }
+    
+    /**
+     * Saves the data to the database.
+     * This method should block the caller as short time as possible.
+     * This method should try block the same amount of time every time it is called.
+     * Try to make the time spent in the method the same for every call (low variation). 
+     * 
+     * @param timestamp_end
+     * @param data
+     */
+    private void save(final long timestamp_end, final int data){
+        //offload the timed loop by not doing the db interaction in this thread.
+        executorPool.execute(new Runnable(){
+            @Override
+            public void run() {
+                logger.log(Level.INFO, "Reporting data. timestamp_end="+timestamp_end+", data="+data);
+                controller.sendDataReport(
+                        new RPiPowerConsumptionSensor(gpioPin),
+                        new PowerConsumptionSensorData(
+                                timestamp_end, data
+                        ));
+            }
+        });
+    }
+    
+}

plugins/raspberry/src/se/hal/plugin/raspberry/plugin.json

@@ -0,0 +1,8 @@
+{
+    "version": 1.1,
+    "name": "Raspberry Pi Sensors",
+    "interfaces": [
+        {"se.hal.intf.HalSensorConfig": "se.hal.plugin.raspberry.RPiPowerConsumptionSensor"},
+        {"se.hal.intf.HalSensorConfig": "se.hal.plugin.raspberry.RPiTemperatureSensor"}
+    ]
+}