Re: [Gumstix-users] Confused about my options

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Thank you very much again Jesse.

We'll look into this and if were successful I'll maybe post something onlin=
e :o)

Arnar

On 1/15/07, Jesse Welling <jes...@gm...> wrote:
>
>
> On 1/15/07, Jesse Welling <jes...@gm...> wrote:
> >
> >
> >
> > On 1/15/07, Arnar Birgisson < ar...@gm...> wrote:
> > > Hello all and thank you Jesse for an excellent response!
> > >
> > > On 1/15/07, Jesse Welling <jes...@gm... > wrote:
> > > > > What I want to do is have a wifi enabled computer onboard a r/c
> > > > > helicpoter connected to a usb webcam. I'm a bit confused about wh=
at
> > > > > expansion boards and/or motherboards I would need.
> > > >
> > > > Currently all Gumstix can be USB  devices only, not USB masters (wh=
ich
> is
> > > > what would be needed)
> > > > You might want to check out some serial cameras though.
> > > > http://www.jrobot.net/Projects/AVRcam.html
> > > >
> http://www.electronics123.com/s.nl/it.A/id.2027/.f?sc=3D8&category=3D241
> > >
> > > This one looks promising, esp. with the 2.2 mm lens (118=B0 fov!). 11=
5.2
> > > Kbps is ok with the gumstix?
> >
> > Should be fine but I have heard that most of those cameras with huge
> angles have no IR filter, which means some colors might look funny but
> wasn't explained very well to me so (^^;)
> >
> >
> > > >
> http://www.acroname.com/robotics/parts/R245-CMUCAM2-PLUS.html
> > > > if you have some time to kill (who does?) the new pxa270 based gums=
tix
> might
> > > > come by the time you are ready to buy.
> > > > IIRC they have USB host capability
> > > >
> > > > > I also like the robostix, and would like to be able to control so=
me
> of
> > > > > the servos on the helicopter - so if possible I'd like the option=
 of
> > > > > adding a robostix to the computer.
> > > >
> > > > This would be your best bet to control the helicopter. But you only
> get 6
> > > > servo channels
> > > > Another option would be a serial servo controller like this one:
> > > > http://www.pololu.com/products/pololu/0207/
> > > > And if you needed more than that I think there are some 16 channel
> ones out
> > > > there.
> > >
> > > My helicopter uses 5 channels, I believe that is usually the case for
> > > r/c helis (throttle, collective, tail/gyro and cyclic x and y). So - =
I
> > > should be ok with the robostix.
> >
> > sounds good.
> >
> >
> > > > > If possible, I'd also like to be able to add the GPStix - but I'm=
 a
> > > > > bit confused about what expansion boards go together and which
> don't.
> > > > > Am I correct that the GPStix requires a stuart for example? Could=
 I
> > > > > connect both a wifi-stix and gpstix to the same motherboard?
> > > >
> > > > Only one 60 pin and one 92 pin board will fit on a connex gumstix.
> > > > What this means is that you have a some options.
> > > > here are some outlined for you (i'm sure there are more)
> > > >
> > > > 1. Wifi/connex/GPStix + serial servo control board
> > > > 2. Wifi/connex/robostix +
> > > > http://www.u-blox.com/products/rcb_4h.html (this is
> the
> > > > same GPS that the GPStix uses)
> > > > 3. Wifi/connex/GPStix + robostix over i2c ( E.G. not using the 60 p=
in
> header
> > > > but using the i2c buss from the GPStix and connecting it to the
> robostix)
> > > >
> > > > the third and second option provide the most flexibility because yo=
u
> can
> > > > latter expand the robostix using the a2d and accelerometers and oth=
er
> IMU
> > > > devices
> > > > for more precise control. Check here for some good sensors:
> > > >
> http://www.sparkfun.com/commerce/categories.php?cPath=3D23_120
> > > >
> http://www.sparkfun.com/commerce/categories.php?cPath=3D23_80
> > > >
> http://www.sparkfun.com/commerce/categories.php?cPath=3D23_85
> > >
> > > Ok, I like no. 3 - do you have any more info on that (links or such)?
> > > The GPStix has 4 a/d convertors - would I be able to use those to run
> > > servos in addition to the ones on the robostix at the same time?
> >
> >
> >
> > a/d doesn't run servo's it just takes measuments (analog to digital), s=
o
> if you wanted to have an auto hover, or a flight recorder, or an autonomo=
us
> pilot you would need those kind of instruments.
> >
> >
> > > How much advantage does a 400mHz cpu hold over a 200MHz one in this
> > > situation? I was thinking about the robostix-wifi pack and the GPStix
> > > in addition. Would that fit option 3 above?
> >
> >
> > I would go with the 400mHz connex without bluetooth. This should give y=
ou
> extra processing power should you choose to use it. but if you choose to =
go
> with the 200xm you might want to look at this pack
> http://www.gumstix.com/store/catalog/product_info.php?products_id=3D174
> and should you choose to use GPStix and serial servo controller you will
> have enough serial ports with out getting rid of a serial terminal (altho=
ugh
> you might not need it with the wifi it's good to have for back up.
> >
> >
> > > One last question - for the GPStix, do I need a Stuart board?
> >
>
> Sorry maybe I misunderstood you.  No you don't specificaly need a stuart
> board because the serial lines are connected through the 60 pin header bu=
t
> they will come to the linux kernel on ttyS2 (which is the Stuart iirc) Bu=
t
> like I said above it's a good idea to have one as back up.
>
> >
> >
> > It's always a good idea to have some way to get a serial terminal, so
> either a tweener or a waysmall board will allow you to get into the boot
> loader should something go wrong with linux on load. other wise you can u=
se
> a serial addapter hooked to your robostix (5v TTL serial to 12v RS-232
> serial) to get a serial terminal incase the wifi isn't working. Here is t=
he
> serial converter I use, it's pin compatable so it's easy to hook up.
> http://www.acroname.com/robotics/parts/S13-SERIAL-INT-CONN.html
> >
> >
> > > > Hope this helped
> > >
> > > Yes indeed, thank you very much.
> >
> >
> > Also you might want to check out the wiki...it has alot of answers ther=
e.
> http://docwiki.gumstix.org/Main_Page but the wiki search is
> a little wonky so I use google to search it instead.
> > Another good place for info is
> http://dir.gmane.org/gmane.linux.distributions.gumstix.general
> it has a record of everthing that has ever been discussed on this mailing
> list. every single problem any one has ever asked about is there so I'd l=
ook
> there if the wiki doesn't turn up any thing.
> >
> >
> > > Arnar
> > >
> > >
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> > --
> > :wq
>
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>
> --
> :wq
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