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Reliability of moving and turning
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Author:  brianeperron [ Tue Jun 03, 2014 11:42 am ]
Post subject:  Reliability of moving and turning

Greetings:

I am new to the RVW and am very pleased with this educational resource. I am trying to sort out some reliability issues with the virtual environment -- that is, when I run a program in the "Curriculum Companion," I am noticing that moving forward and turning is not always accurate or reliable. The movements will be off slightly on each run, even if there are no changes in the program. Sometime I might get something that is really pretty far off. Is this lack of reliability purposefully built into the environment, given that the real robots do not have perfect reliability? Or, is there something wrong with the software that I have installed.

I am using the EV3 Teacher's edition (graphical programming environment).

Any comments would be greatly appreciated.

Thanks,
Brian

Author:  rcahoon [ Tue Jun 03, 2014 4:46 pm ]
Post subject:  Re: Reliability of moving and turning

Hi Brian,
brianeperron wrote:
Is this lack of reliability purposefully built into the environment, given that the real robots do not have perfect reliability?

Yep, this is exactly correct. The Robot Virtual Worlds are running a simulation of real-world physics. In building our Robot Virtual Worlds (as well as our other products), we try to find a good balance between exposing students to the challenges involved in mobile robotics and providing enough structure so they don't become overwhelmed.

It sounds like you're using Virtual NXT*. We should have a new release out soon that improves the reliability of the movements somewhat. Watch http://www.robotics-academy.org/blog/ and http://cs2n.org/blog for the announcement.

Best regards,
--Ryan


* If you're using ROBOTC: If you haven't already, try using encoder-based movements instead of time-based ones. This will improve the reliability of your program. If you upgrade to ROBOTC 4.10 and the version of Curriculum Companion that comes with it, you'll also have access to nMotorEncoderTarget moves. We'll be rolling out these updates to the rest of the Robot Virtual Worlds shortly.

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