Java and R/F Controlled DC motor

Hi guys.
I need some help. I am working on a physics poroject that interfaces a computer to a radio circuit that controls a DC motor on board a model toy car. The issue of the electronics has been solved. What remains is to be able to write the program for controlling the craft remotely from my PC. I have found Java to be more convenient to do that and thats why I have asked for your help.
What I want to know is
a) Is this viable?
b) If yes, how?
c) further, can it be programmed to control itself from point a to point B without human intervention, just using the terrain map fed into it?
Thanks a lot.

OK I prefer to help you from where you are. Where
Java is concerned I'm unclear where you are. So for
starters...
1 Have you connected/communicated with the control
interface yet?
2 Assuming you havn't written any Java for the App
yet then how about identifying a few objects in the
application.
Choices might be
The UI (Maybe One Screen with Buttons)
Each Button
A Map (Perhaps showing actual or estimated position)
A History (of Previous Commands/Responses)
A Command,
A Response,
A Status (or Position if you have GPS fitted)
Yes to the two questions above

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Attachments:
PIDControl.vi ‏23 KB
BIOGROWTH.lvproj ‏46 KB

Hi Lawrence,
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sir
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Here's the interesting thing: It zips the files, and then when I use the size() method for zip files in java, it says 284 files. But when I unzip, it says 288 again. It's like there's files missing when compressed, but when decompressed, they return. Note that the files are actually there. If I open the archive in a third party app such as Winzip AND Winrar AND IZarc, they all show 288 files. Any idea what would make the number of files appear incorrectly in a zip file when zipped by java with the code above? Thanks in advance.
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Edit:
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Edited by: BBlop on Dec 13, 2009 11:29 AM

guess what it says java file. So yes i'm sure. Sarcasm. Not the best way to encourage a total stranger to help you. Then there's
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jduprez wrote:
Thank you again.
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- Drag-and-drop support
- Configurable views
- Online and (for the Runtime Analyzer) context-sensitive help
- Connect-on-demand to local JVMs and autodiscover remote JVMs
One particular area of interest is GC profiling, where much more detailed metrics are available, which can help drill down into the causes for long GC pause times and spikes.
Release notes:
http://edocs.bea.com/jrockit/tools/relnotestools/relnotestools2.html
There is no separate download for JRockit Mission Control, instead it is included in the JRockit R27.1 JDK downloads for Windows and Linux/x86. To start using the tools, install JRockit and select JRockit Mission Control from the Windows Start menu, or launch the $JROCKIT_HOME/bin/jrmc executable.
Documentation is bundled with the installation and available from the Help menu.
If you have any questions, comments or concerns, please visit our user forums at forums.bea.com/bea/forum.jspa?forumID=2009.
Happy holidays!
Henrik Stahl
Product Manager

Hi,
I have tried and installed the version R27.1.0-109-73164-1.5.0_08-20061129-1415-linux-x86_64 on our 16GB RAM
with 4 dual-core Opteron processor.
JAVA_OPTS="-server -Xms800M -Xmx4000M -Djava.net.preferIPv4Stack=true -Xpausetarget=2500ms -Xverboselog:/var/log/javavm.log -Xverbose:gc,memory -Xverbosetimestamp -Xgcpause -Xgcreport -Xstrictfp -XXexitOnOutOfMemory -XXdumpFullState -XXstaticCompaction -XXcompactRatio:10 "
After 5 secs of jvm startup I receive the follwing trace (without any DUMP-file):
java.lang.OutOfMemoryError: class allocation JVM@check_alloc (src/jvm/model/classload/classalloc.c:1
22). 42216 bytes requested. Java heapsize=838860800, paged memory=0/0.
Probable cause: Too large java heap setting.
Try to reduce the Java heap size using -Xmx:<size> (e.g. "-Xmx128m")
at java/lang/Class.getDeclaredMethods0(Z)[Ljava/lang/reflect/Method;(Native Method)
    at java/lang/Class.privateGetDeclaredMethods(Class.java:2395)
    at java/lang/Class.getMethod0(Class.java:2642)
    at java/lang/Class.getMethod(Class.java:1579)
    at org/apache/xalan/processor/XSLTAttributeDef.setAttrValue(XSLTAttributeDef.java:1611)
    at org/apache/xalan/processor/XSLTElementProcessor.setPropertiesFromAttributes(XSLTElementProces
sor.java:338)
    at org/apache/xalan/processor/XSLTElementProcessor.setPropertiesFromAttributes(XSLTElementProces
sor.java:263)
    at org/apache/xalan/processor/ProcessorTemplateElem.startElement(ProcessorTemplateElem.java:76)
    at org/apache/xalan/processor/StylesheetHandler.startElement(StylesheetHandler.java:623)
    at org/apache/xerces/parsers/AbstractSAXParser.startElement(Lorg/apache/xerces/xni/QName;Lorg/ap
ache/xerces/xni/XMLAttributes;Lorg/apache/xerces/xni/Augmentations;)V(Unknown Source)
    at org/apache/xerces/impl/XMLNSDocumentScannerImpl.scanStartElement()Z(Unknown Source)
    at org/apache/xerces/impl/XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Z)Z(
Unknown Source)
    at org/apache/xerces/impl/XMLDocumentFragmentScannerImpl.scanDocument(Z)Z(Unknown Source)
    at org/apache/xerces/parsers/XML11Configuration.parse(Z)Z(Unknown Source)
    at org/apache/xerces/parsers/XML11Configuration.parse(Lorg/apache/xerces/xni/parser/XMLInputSour
ce;)V(Unknown Source)
    at org/apache/xerces/parsers/XMLParser.parse(Lorg/apache/xerces/xni/parser/XMLInputSource;)V(Unk
nown Source)
    at org/apache/xerces/parsers/AbstractSAXParser.parse(Lorg/xml/sax/InputSource;)V(Unknown Source)
    at org/apache/xerces/jaxp/SAXParserImpl$JAXPSAXParser.parse(Lorg/xml/sax/InputSource;)V(Unknown
Source)
    at org/apache/xalan/processor/TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:92
0)
    at org/jboss/deployment/XSLSubDeployer.createService(XSLSubDeployer.java:141)
    at org/jboss/system/ServiceMBeanSupport.jbossInternalCreate(ServiceMBeanSupport.java:260)
    at org/jboss/system/ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:243)
    at sun/reflect/GeneratedMethodAccessor2.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/
Object;(Unknown Source)
    at sun/reflect/DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java/lang/reflect/Method.invoke(Method.java:585)
    at org/jboss/mx/interceptor/ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
    at org/jboss/mx/server/Invocation.dispatch(Invocation.java:94)
    at org/jboss/mx/server/Invocation.invoke(Invocation.java:86)
    at org/jboss/mx/server/AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
    at org/jboss/mx/server/MBeanServerImpl.invoke(MBeanServerImpl.java:659)
    at org/jboss/system/ServiceController$ServiceProxy.invoke(ServiceController.java:978)
    at $Proxy0.create()V(Unknown Source)
    at org/jboss/system/ServiceController.create(ServiceController.java:330)
    at org/jboss/system/ServiceController.create(ServiceController.java:273)
    at sun/reflect/GeneratedMethodAccessor4.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/
Object;(Unknown Source)
    at sun/reflect/DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java/lang/reflect/Method.invoke(Method.java:585)
    at org/jboss/mx/interceptor/ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
    at org/jboss/mx/server/Invocation.dispatch(Invocation.java:94)
    at org/jboss/mx/server/Invocation.invoke(Invocation.java:86)
    at org/jboss/mx/server/AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
    at org/jboss/mx/server/MBeanServerImpl.invoke(MBeanServerImpl.java:659)
    at org/jboss/mx/util/MBeanProxyExt.invoke(MBeanProxyExt.java:210)
    at $Proxy4.create(Ljavax/management/ObjectName;)V(Unknown Source)
    at org/jboss/deployment/SARDeployer.create(SARDeployer.java:258)
    at org/jboss/deployment/MainDeployer.create(MainDeployer.java:953)
    at org/jboss/deployment/MainDeployer.deploy(MainDeployer.java:807)
    at org/jboss/deployment/MainDeployer.deploy(MainDeployer.java:771)
    at jrockit/vm/RNI.c2java(JJJJ)V(Native Method)
    at jrockit/vm/Reflect.invokeMethod(Ljava/lang/Object;Ljava/lang/Object;[Ljava/lang/Object;)Ljava
/lang/Object;(Native Method)
    at sun/reflect/NativeMethodAccessorImpl.invoke0(Ljava/lang/reflect/Method;Ljava/lang/Object;[Lja
va/lang/Object;)Ljava/lang/Object;(Native Method)
    at sun/reflect/NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun/reflect/DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java/lang/reflect/Method.invoke(Method.java:585)
    at org/jboss/mx/interceptor/ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
    at org/jboss/mx/server/Invocation.dispatch(Invocation.java:94)
    at org/jboss/mx/interceptor/AbstractInterceptor.invoke(AbstractInterceptor.java:133)
    at org/jboss/mx/server/Invocation.invoke(Invocation.java:88)
    at org/jboss/mx/interceptor/ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor
.java:142)
    at org/jboss/mx/server/Invocation.invoke(Invocation.java:88)
    at org/jboss/mx/server/AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
    at org/jboss/mx/server/MBeanServerImpl.invoke(MBeanServerImpl.java:659)
    at org/jboss/mx/util/MBeanProxyExt.invoke(MBeanProxyExt.java:210)
    at $Proxy8.deploy(Ljava/net/URL;)V(Unknown Source)
    at org/jboss/deployment/scanner/URLDeploymentScanner.deploy(URLDeploymentScanner.java:421)
    at org/jboss/deployment/scanner/URLDeploymentScanner.scan(URLDeploymentScanner.java:634)
    at org/jboss/deployment/scanner/AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymen
tScanner.java:263)
    at org/jboss/deployment/scanner/AbstractDeploymentScanner.startService(AbstractDeploymentScanner
.java:336)
    at org/jboss/system/ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)
    at org/jboss/system/ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)
    at sun/reflect/GeneratedMethodAccessor2.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/
Object;(Unknown Source)
    at sun/reflect/DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java/lang/reflect/Method.invoke(Method.java:585)
    at org/jboss/mx/interceptor/ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
    at org/jboss/mx/server/Invocation.dispatch(Invocation.java:94)
    at org/jboss/mx/server/Invocation.invoke(Invocation.java:86)
    at org/jboss/mx/server/AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
    at org/jboss/mx/server/MBeanServerImpl.invoke(MBeanServerImpl.java:659)
    at org/jboss/system/ServiceController$ServiceProxy.invoke(ServiceController.java:978)
    at $Proxy0.start()V(Unknown Source)
    at org/jboss/system/ServiceController.start(ServiceController.java:417)
    at sun/reflect/GeneratedMethodAccessor9.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/
Object;(Unknown Source)
    at sun/reflect/DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java/lang/reflect/Method.invoke(Method.java:585)
    at org/jboss/mx/interceptor/ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
    at org/jboss/mx/server/Invocation.dispatch(Invocation.java:94)
    at org/jboss/mx/server/Invocation.invoke(Invocation.java:86)
    at org/jboss/mx/server/AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
    at org/jboss/mx/server/MBeanServerImpl.invoke(MBeanServerImpl.java:659)
    at org/jboss/mx/util/MBeanProxyExt.invoke(MBeanProxyExt.java:210)
    at $Proxy4.start(Ljavax/management/ObjectName;)V(Unknown Source)
    at org/jboss/deployment/SARDeployer.start(SARDeployer.java:302)
    at org/jboss/deployment/MainDeployer.start(MainDeployer.java:1007)
    at org/jboss/deployment/MainDeployer.deploy(MainDeployer.java:808)
    at org/jboss/deployment/MainDeployer.deploy(MainDeployer.java:771)
    at org/jboss/deployment/MainDeployer.deploy(MainDeployer.java:755)
    at jrockit/vm/RNI.c2java(JJJJ)V(Native Method)
    at jrockit/vm/Reflect.invokeMethod(Ljava/lang/Object;Ljava/lang/Object;[Ljava/lang/Object;)Ljava
/lang/Object;(Native Method)
    at sun/reflect/NativeMethodAccessorImpl.invoke0(Ljava/lang/reflect/Method;Ljava/lang/Object;[Lja
va/lang/Object;)Ljava/lang/Object;(Native Method)
    at sun/reflect/NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun/reflect/DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java/lang/reflect/Method.invoke(Method.java:585)
    at org/jboss/mx/interceptor/ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
    at org/jboss/mx/server/Invocation.dispatch(Invocation.java:94)
    at org/jboss/mx/interceptor/AbstractInterceptor.invoke(AbstractInterceptor.java:133)
    at org/jboss/mx/server/Invocation.invoke(Invocation.java:88)
    at org/jboss/mx/interceptor/ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor
.java:142)
    at org/jboss/mx/server/Invocation.invoke(Invocation.java:88)
    at org/jboss/mx/server/AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
    at org/jboss/mx/server/MBeanServerImpl.invoke(MBeanServerImpl.java:659)
    at org/jboss/mx/util/MBeanProxyExt.invoke(MBeanProxyExt.java:210)
    at $Proxy5.deploy(Ljava/lang/String;)V(Unknown Source)
    at org/jboss/system/server/ServerImpl.doStart(ServerImpl.java:482)
    at org/jboss/system/server/ServerImpl.start(ServerImpl.java:362)
    at org/jboss/Main.boot(Main.java:200)
    at org/jboss/Main$1.run(Main.java:464)
    at java/lang/Thread.run(Thread.java:595)
    at jrockit/vm/RNI.c2java(JJJJ)V(Native Method)
    -- end of trace
JRockit aborted: Out of memory (68)
Failed to acquire native memory. Try reducing Java heap size using -Xmx:<size> (i.e "-Xmx16m")
If I change the -Xmx parameter from -Xmx4000M to -Xmx3000M
than it didn't work, but
if I change the -Xmx parameter from -Xmx4000M to -Xmx2900M
than it works.
(The hint to change -Xmx to -Xmx16m is great on a 16GB RAM machine,.. :-) )
Any ideas?
How can I use 4GB java-heap ?
Greetings Martin

How to use sinewave to controll my motor run automatically.

Hello
I am now tring to use a waveform(sinwave ) to control my motor run automatically .I am using labview2010 and EPOS50/5. Is there anyone can give me your suggestion? Thanks in advance.The attachment is the program for my epos.
Attachments:
epos and sinewaveform.vi ‏34 KB

PS: My program for epos can work, but I don not know how to combine the sinewave program with the epos program to make motor run automatically.
Thanks your suggestion in advance.

Java and R/F Controlled DC motor

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