Re: [Gumstix-users] Need Help choosing Gumstix and expansion boards

[Brian J <bri...@ya...>]

Thanks for the feedback.  The only reason I was thinking ethernet was to
simplify things.  All I'd need to connect modem to Gumstix is an ethernet
cable.  

I'll think I'll take your advice and go with a 3rd party GPS solution.  Just
so you know, I am working on a remotely piloted boat primarily for research
and maybe search and rescue.  It will maybe be 3 or 4 feet long at most. 
Initially I will pilot it from a command center application installed a
laptop computer.  I really need a good quality radio modem, preferably with
enough bandwidth to transmit basic telemetry and a live video feed.  It will
not be autonomous initially so the video feed will need to have reasonable
frame rates and minimal latency.  If you have any suggestions of a FreeWave
modem that might be suitable then I'd appreciate your recommendation.  I'd
like to get range of about 2 miles, through trees and other forestation and
maybe 5 miles line-of-sight.

Thanks,

Brian Joly


Jay Phillips wrote:
> 
> There are many different ways to skin this cat.
> 
>  
> 
> One question I have is why do you want to connect to the radio modem via
> Ethernet? The transmission rates are slow enough that serial or USB work
> fine. I only mention this because I've gone through that selection process
> for a UAV. BTW, after using Microhard for a while we switched to FreeWave.
> Your specific needs may be different.
> 
>  
> 
> While I have no experience with, and nothing against the GPSstix board
> (and
> want to see Gumstix, Inc. do well :-) ), don't rule out one of the many
> GPS
> boards available that could connect through I2C, SPI, serial, or ???.
> 
>  
> 
> I'm also working on a robotics project. I chose the verdex xm-4, robostix,
> netwifimicro-SD bundle. I was at a point where I needed to do some
> experimentation in order to narrow my design choices, but they weren't
> narrow enough to define "The" board set to do the job. I chose this
> combination because its combined feature set seemed likely to be at least
> 90% of what I need.
> 
>  
> 
> -----------------------------------------------------
> 
> Jay Phillips
> 
> Tronix LLC - http://tronixllc.com
> 
>  
> 
>   _____  
> 
> From: gum...@li...
> [mailto:gum...@li...] On Behalf Of Brian
> Joly
> Sent: Wednesday, February 06, 2008 10:23 AM
> To: gum...@li...
> Subject: [Gumstix-users] Need Help choosing Gumstix and expansion boards
> 
>  
> 
> I am trying to determine the best gumstix board and expansion boards to
> fit
> my mobile robot project goals.  Briefly stated, I want to be able to
> network
> remotely with a gumstix computer.  I will likely be using modems such as
> the
> Spectra 920A from Microhard Corp <
> <http://www.microhardcorp.com/Spectra920A.htm>
> http://www.microhardcorp.com/Spectra920A.htm>.  I want to be able to drive
> servos and connect to various sensors (ie, GPS).  Based on these goals, I
> think I should go with the Connex 400xm with both Robostix and GPSstix
> expansion boards but I also need to have ethernet to connect to my modem.
> Any recommendations?  Perhaps I should switch to Verdex, but then I
> wouldn't
> be able run GPS stix.
> 
> Any advice would be greatly appreciated.
> 
> Thanks,
> 
> Brian
> 
>  
> 
>   _____  
> 
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