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Raspberry Pi or Beagle Board!!??

aeroaks

I want to know which is better Raspberry Pi or Beagle Board?

  • 1. Re: Raspberry Pi or Beagle Board!!??
    michaelkellett

    What is your application ?

     

    Michael Kellett

  • 2. Re: Raspberry Pi or Beagle Board!!??
    aeroaks

    I am starting. Apart from Price, what are the characteristic differences? use for robotics and real-time embedded application.

  • 3. Re: Raspberry Pi or Beagle Board!!??
    michaelkellett

    I don't think I would use either for what I would call a real-time embedded application but the defintion of real-time is very vague.

     

    from Wiki: systems that are subject to a "real-time constraint"— e.g. operational deadlines from event to system response

     

    But on that basis almost everything is  a real time system.

     

    So the Beagle and RPi are OK for deadlines in the order of 10s of mS, less with some hard work, but they don't (normally) use a real time OS.

     

     

    But you should do your own research - download the data for both boards - compare them with each other and your specification.

     

    No one can help you unless you describe your project in a lot more detail.

     

    Michael Kellett

  • 4. Re: Raspberry Pi or Beagle Board!!??
    robotonics

    As an Engineer I would choose the Beagle Board...especially with the fiasco surrounding Raspberry Pi at the moment.

     

  • 5. Re: Raspberry Pi or Beagle Board!!??
    DAB

    For price/performance, you should take a look at the TI MSP430 line.

    The Launchpad only costs 4.30 USD and gives you a sixteen bit device.

    If you go read my Blogs on the MSP430F5438IPZRMSP430F5438IPZR, you will see that the MSP430 has a very robust suite of real time options that would be ideal for robotics or any other real time processes.

     

    Just a thought,

    DAB

  • 6. Re: Raspberry Pi or Beagle Board!!??
    Nate1616

    I agree with the posts above in that we would need to know your intended application a little more.   But if you are set in using one of the 2 then I would go with the beagle board.  I'm a fan of the raspberry pi but think beagle board is a better solution all around.  Like DAB said for the price and robustness the msp430 is the best solution.  Just me thought though.

  • 7. Re: Raspberry Pi or Beagle Board!!??

    Here is some more information on the BeagleBoneBeagleBone to help with your decision...

     

    Also a good discussion here on the Pi vs. BeagleBone...  http://www.element14.com/community/message/52904#52904/l/re-combining-beaglebone-and-raspberry-pi

     

    http://beagle.s3.amazonaws.com/graphics/beaglebone/beaglebone-in-hand.JPG

     

    What is the BeagleBoneBeagleBone capable of doing?

     

    Watch the vidoes, find design files, view the addon boards and simply learn more here...

  • 8. Re: Raspberry Pi or Beagle Board!!??
    BabaBooey

    Michael Kellett wrote:

     

    I don't think I would use either for what I would call a real-time embedded application but the defintion of real-time is very vague.

     

    from Wiki: systems that are subject to a "real-time constraint"— e.g. operational deadlines from event to system response

     

    But on that basis almost everything is  a real time system.

    That's absolutely not the case.

    Almost nothing is a real time system.

    real-time is about meeting the deadline or missing the deadline as in event occurs at time X. Deadline is at X + 30ms.

    In case of hard real-time if the deadline is missed somebody might get hurt or die (airplane, car, robots etc.).

    In case of soft real-time if the deadline is missed it's inconvenient (video streaming, voice over ip etc.).

  • 9. Re: Raspberry Pi or Beagle Board!!??
    Drew Fustini

    Given this the Open Source Hardware group, it's worth noting that the BeagleBone is Open Source Hardware.  The design files are available here: http://beagleboard.org/hardware/design/

     

    Unfortunately, at this time, the Raspberry Pi can not be considered Open Source Hardware.  The schematic has been released, but the board layout has not yet been released.  The Raspberry Pi Foundation has commented that they would like to release it at some point in the future.

  • 10. Re: Raspberry Pi or Beagle Board!!??
    Joe Alderson

    If you're interested in real-time embedded & robotics applications - what about a TI EvalbotTI Evalbot? Might be a good place to start because you can download the Micrium pdf book for free which takes you through using an RTOS from the beginning.

     

    Has anyone used one of these (or any other stellaris dev kits) - any opinions?

  • 11. Re: Raspberry Pi or Beagle Board!!??
    michaelkellett

    @ Baba,

     

    You have provided your own peronal definition of hard real time - can you back it up with any references ?

     

    To back up my own comments:

     

    Hard real-time systems are ones in which correctness depends on execution

    occurring within a fi xed period of time [GR04]. Surprisingly, most previous re-

    search in runtime monitoring focuses either on non real-time programs or soft

    real-time systems, in which occasionally missing deadlines is tolerated.

    (from a paper presented at International Conference on Runtime Verification 2010)

     

    Hard or softness of real time is not a measure of the importance of systme failure.

     

    Michael Kellett

  • 12. Re: Raspberry Pi or Beagle Board!!??
    DAB

    In my experience, the term "real time" is relative.

     

    If your requirements have a specific time response number, then that becomes your real time event to design to.

    If you cannot measure the response, then it is not real time.

     

    After you establish your real time event, you have to do a criticality/risk assessment as to the effect of missing the defined response time.  In either case, you have to have a strategy for dealing with the lost event, should it occur.

     

    In systems engineering, we had to go through every system event until we could show that the system reached a specific level of survivability for a specific cost.  It was only after that analysis  that the system functions were allocated between hardware and software.  When software was not fast enough, you go to a hardware solution.  It may not be the most versatile, but it can usually meet any realtime constraint.

     

    The same goes for selecting the computer processor.  You have to pick one that when combined with the software has enough capability to meet the requirements allocated to it.  In advanced applications, you often are limited in your candidates to select from, so you need to understand your choice in very great detail.

     

    Now back to the topic, the selection between PI and BeagleBone depends upon your requirements.

    If both satisfy your requirements, then you look at the expense of the development environment.  Sometimes the cheaper processor carries the highest cost to develop.  The worst thing you can do is try to pit one against the other without a defined set of requirements.

     

    Thats the truth for all processor selections.  It is more than just selecting the board.  You have to look at the bigger picture of your intended application and understand that whichever one you choose, it will be obsolete before it gets delivered.

     

    I hope I have added enough confusion to the original question, but I have worked on many state of the art realtime systems.  If you do not fully understand your requirements, you will fail. 

    I successfully implemented a lot of systems in applications where people said that you could not do the job in software.  The requirements are the key.  Understand them and you will be successful.  Ignore them and you will fail.

     

    As stated by the gospel of DAB.

     

    Just my opinion.

    DAB

  • 13. Re: Raspberry Pi or Beagle Board!!??
    John Beetem

    There's going to be an Open Source Hardware Panel Discussion at the upcoming DesignWest show in San Jose, California starring Jason Kridner (BeagleBoards) and Gert Van Loo (Raspberry Pi / Gertboard).  I sure hope it devolves into a Pi fight about whether RasPi is Open Source Hardware (oh yeah?  Let's see the Gerbers!  Tell me where I can get a BCM2835 in small quantities -- with a full tech ref!) and whether Open Source Hardware is a Good Idea (oh yeah? If OSH is so great, how come RasPi has sold 1M in one year and BBs have only sold 100K in 4.5?  huh?  huh?)

     

    Actually, I doubt it'll be that much fun, but should be informative.  12 Noon PDT, 23 April 2013.  Expo Theatre shows are included in the free (as in beer) expo pass.

  • 14. Re: Raspberry Pi or Beagle Board!!??
    Drew Fustini

    darn it, now I need to figure out how to get out to California because that looks very interesting!

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