[Robotgroup] Embedded Gnu/Linux Hardware Recommendation?

[Rhett Creighton]

Hey guys, sorry I know I'm replying to an old thread.  Here are some
things I found out:

http://www.gumstix.com/ are pretty neat modular boards that run linux.

Because linux is not a real time OS, one should anticipate scheduling
latency on the order of 10ms, so one should not try to control devices
directly from software running in linux that requires better
performance than that.

If you need higher precision timing, there are socalled realtime
OS'es.  Many of these are hacked versions of linux, and can get
improve your latency by a factor of 100.

However, i feel like in many cases, if you need the timing to be that
good, you should be running that process on an external device that
isn't running an operating system.

On 2/5/08, Gray Mack <gray_mack at yahoo.com> wrote:
> the linksys wrt54g router and nslu2 network to usb
>  drive have been well hacked. The wrt54g has wireless
>  lan and I think serial port, the nslu2 has usb host
>  capabilities for thumbdrives, etc.
>  As for an imbedded board with I/O pins not sure, maybe
>  try the products from gumstix.
>  Eric has a small pc (on seekerbot I think) but I
>  forgot the brand.
>  I dont know if the Make Magazine sponsored products
>  run linux or not.
>
>  Some of these devices can take several Amps so match
>  the power consumption with your battery requirements.
>  The hardest part of the selection is drivers,
>  especially if its a small or custom flavor of linux.
>  If for example you want usb webcam video in, then make
>  sure there is usb and a reliable driver for that
>  webcam or else you are looking at a tough software
>  integration before even getting to the robot
>  algorithms.
>  Good luck and let us know what you find.
>
>  -Gray
>
>
>  --- Rhett Creighton <Rhett at creighton.com> wrote:
>
>  > Hey, can anyone recommend a good hobbyist board for
>  > using gnu/linux to
>  > control robots?
>  >
>  > Wishlist:
>  >
>  > Under a few hundred dollars
>  > A few hundred megabytes of flash memory
>  > usb connector
>  > some other lower latency port
>  > ethernet
>  > able to run in hard real time
>  >
>  > Thanks!
>  > Rhett
>
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