Subject:
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Re: How to communicate sensor value changes to RCX Tower
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 5 Nov 1999 23:21:07 GMT
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Reply-To:
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nospam-dcchen@pacbell.SAYNOTOSPAMnet-nospam
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Viewed:
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2280 times
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I believe that Variable 0 can be used as a flag and there is a special
way
to constantly poll for a change in that value. Perhaps you could have a
task that logs all sensor values into the RCX DataLog and use Variable 0
to
indicate when the DataLog has data available for d/l. When the program
running on the Java device notes a change in Variable 0, it can then d/l
the DataLog and extract the sensor data from it. Much faster than using
the
SendMessage command and you'd probably lose much less data that way.
Dave
"Farrukh S. Najmi" wrote:
>
> Hello all,
>
> I am a mindstorm newbie and have just started writing a high level Java
> toolkit for mindstorms. It is based on RCXPort by Scott Lewis at the lowest
> level. Kudos to Scott for a greta job and for helping me get boot-strapped.
>
> The toolkit is designed in the context of a Java and OO programming course
> I am teaching to young middle school students. It is different from NQC,
> RCXPort etc in that the main controlling program (controller) is written in
> Java and runs on a JVM on a host computer other than RCX (it is never
> downloaded as a program). Instead the controller send command to the RCX as
> needed and the RCX sends sensor changes to the controller on an event
> driven basis. This allows for the controller to not be resource constrained
> and can be written in an OO fashion in Java using a high level class
> library. It aslo allows me to teach key programming concepts in terms that
> my students can appreciate. Once V1.0 is complete, I plan to make the bits
> available. I also plan to port the toolkit to Palm Pilot running the KVM
> Java Virtual Machine at some point, thus elimination the RCX tower and
> using the palm's as a remote controller in addition to the software
> controller.
>
> My question to you is... I am not sure how to best send a changed sensor
> value to the controller. I know I can always poll from the controller to
> the RCX but that seems rather inefficient. I have got an NQC program that
> is attempting to model the event driven notification I am looking for.
> Could someone help with some of the reamining detail:
>
> -How to use SendMessage to notify the RCX tower of the new value of
> SENSOR_1?
> -How to best use the in-line function touchSensorDetector so that it can
> use the sensorId and avoid hardcoding SENSOR_1?
>
> Thanks for your help.
>
> -----Begin NQC program
>
> task touchSensor1Detector() {
> touchSensorDetector(1);
> }
>
> task main() {
> StopAllTasks();
>
> }
>
> void touchSensorDetector(int sesnsorId) {
>
> //Initialize sensor
> SetSensor(SENSOR_1, SENSOR_TOUCH);
>
> //initialize variable
> int lastSensorValue=0;
>
> while (true) {
>
> //Keep checking for change in sensor value in a loop
> while (lastSensorValue == SENSOR_1) {
> continue;
> }
>
> //Sensor value has changed
> //Remember new sesnor val in variable
> lastSensorValue = SENSOR_1;
>
> //Send the new sensor value to master control program on host
> computer
> //SendMessage();
>
> //Clear the Message so new Messages may come in
> //ClearMessage();
> }
>
> }
>
> Vadim Strizhevsky wrote:
>
> > Todd Lehman writes:
> > [snip]
> > > 3. Vadim Strizhevsky's & Owen Stenseth's RCXLib (not sure of the
> > > current status)
> > >
> > >
> >
> > Sad to say, but it is more or less dead. No effort or coding for it
> > has been done since, oh probably New Years time. Both Owen and myself
> > sort of lost interest and/or time in the project or mindstorms or
> > maybe both. Speaking from myself I haven't in general touched my
> > mindstorms set (the only LEGO set I ever owned) since around that time
> > as well, which is probably the most direct reason for not advancing
> > this project. And although I keep alive hopes of getting back into it,
> > reallisticly it will probably not happen as I moved on to other
> > things. But as they say, never say never...
> >
> > I'm glad to see that the topic of Palm->Mindstorms control, which was
> > of special interest to me, is not dead. And while I haven't tried Mike
> > Kory's program, looking at its screen shots it looks excellent, and
> > at much more advanced point than the stuff we did. Good Luck Mike!
> >
> > Thanks,
> > Vadim
>
> --
>
> Regards,
> Farrukh
>
> --
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Message is in Reply To:
 | | How to communicate sensor value changes to RCX Tower
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| Hello all, I am a mindstorm newbie and have just started writing a high level Java toolkit for mindstorms. It is based on RCXPort by Scott Lewis at the lowest level. Kudos to Scott for a greta job and for helping me get boot-strapped. The toolkit is (...) (27 years ago, 5-Nov-99, to lugnet.robotics)
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